Synthesis of borate ester‐grafted carboxylated acrylonitrile butadiene rubber and its use as electron acceptor to dissolve lithium perchlorate

A novel borate ester (BE)‐grafted carboxylated acrylonitrile butadiene rubber (XNBR) was synthesized. From Fourier transform infrared, ¹H NMR and elemental analyses, the borate ester was successfully grafted to XNBR, resulting in a more flexible XNBR chain as revealed by differential scanning calorimetry. The binding energies of boron, oxygen, lithium and chlorine atoms of XNBR‐g‐BE–LiClO₄ are quite different from those of XNBR or LiClO₄. Meanwhile, the wavenumbers of C? O? B? O? C, C?O and C? H vibrations of the benzene ring shift towards lower values and a new shoulder peak for ? CN at about 2260 cm^?1 emerges. By integrating fitting peak areas of ? CN groups and ClO₄^?, the fractions of ? CN group and ClO₄^? bidentate bonding in XNBR‐g‐BE–LiClO₄ are much higher than in NBR–LiClO₄. Based on these experiments, a possible dissociation mechanism is proposed in which the boron atom of XNBR‐g‐BE receives electron pairs from ClO₄^?, releasing partial positive charge of Li⁺ to bind with ? CN group. © 2016 Society of Chemical Industry     

Polypyrrole conductive polymer characteristics as an optical display device

The redox dynamic of electrochemically prepared thin films of polypyrrole is studied. A semi-empirical formula to explain the redox behavior is formulated and it seems applicable to the reduction dynamic. The redox dynamic is dominated by a diffusion process, depending on the relation between the film thickness and the rise time (t_1/2) of the reduction process. The diffusion coefficient, D, was measured to be 2 × 10^?9 cm²/sec for perchloride (ClO₄^?) anion dopant and 1.1 × 10^?9 cm²/sec for para-toluenesulfonate (PTS^?) anion dopant. The polypyrrole films exhibited a color change during the oxidation and reduction processes. The electrooptical properties of these films are studied.     

Role of defects in tailoring optical,electronic, and luminescent properties of Cu-doped ZnO films

We present a detailed characterization study on copper-doped ZnO films to correlate the films' electronic and optical properties with the existing native defects in the lattice. In addition, we describe the variation in the concentration of these defects with Cu dopant and temperature. The results of XRD confirmed the single-phase würtzite-structure of the synthesized films. The SEM images showed a homogeneous and dense grain morphology with a granular form and a signature for a hexagonal-like shape. The EDX, XPS, and UV–Vis spectra showed the proper doping of Cu ions into the lattice. The XPS analysis indicated mixed electronic states of both Cu²⁺ and Cu¹⁺ and showed a clear increase in the Cu²⁺ intensity relative to Cu¹⁺, with Cu dopant. The transmittance spectra exhibited an average value above 80% in all doped films in the visible and infrared regions. The overall results indicated a clear link between the films’ optical and electronic responses and the level of the intrinsic defects in the lattice. By increasing the Cu dopant, we find a slight reduction in the energy bandgap (E_g). This is correlated with a clear reduction in the blue emission luminescence band associated with the V_Zn and in the yellow emission band associated with the O_i. On the other hand, we observed a clear enhancement in the green emission band originating from the V_O, and in the emission band related to possible transitions from Zn_i levels to O_i levels. The slight reduction in the E_g signals a weak sp-d hybridization between the ZnO conduction band electrons and the Cu²⁺ ions, which is mediated by the intrinsic defects. With reducing the temperature, the photoluminescence temperature profiles indicated a slight increase in the E_g values and a negligible effect on the distribution of the native defects.     

Mixed fuel approach for the fabrication of TiO2:Ce3+ (1–9 mol%) nanophosphors: Applications towards wLED and latent finger print detection

TiO₂:Ce³⁺ (1–9?mol%) nanophosphors (NPs) were prepared by solution combustion method using combination of fuels. PXRD studies of pure and doped samples exhibit rutile and anatase phases respectively. SEM results indicate that the particles were found to be nearly spherical in nature. The energy band gap (E_g) of pure and doped samples was found to be in the range 3.10–3.23?eV. The active vibrational Raman modes observed at ～ 141, 446 and 608?cm^?1 were corresponds to B_1g, E_g and A_1g respectively. The mode at ～ 229?cm^?1 was due to second order effect that confirms the rutile phase of TiO₂. The CIE and CCT results of the doped TiO₂ shows that this product exhibits green colour (CIE-coordinates x = 0.3649, y = 0.4023) and was suitable for wLEDs which can be used for household applications. The optimized product was further utilized for the visualization of latent finger prints (LFPs) on various porous and non- porous surfaces. The results reveal that, all the levels (I–III) of ridge feature were clearly visualized under normal light indicating that the powder was a reliable and promising labeling agent for LFPs detection as well as wLED applications.     

Ferromagnetic Enhancement in ZnTiO3 films induced by Co doping

ZnTiO₃ is a promising wide band gap semiconductor material due to its actual and potential applications in catalysts, nonlinear optics, luminescent materials, microwave dielectrics, gas sensors, and solar cells. In this report, Co-doped ZnTiO₃ nanocrystal films were prepared on Si wafers using chemical solutions, and their structural, optical, and magnetic properties were investigated. Co²⁺ ion in the films was confirmed via X-ray photoelectron spectroscopy. X-ray diffraction demonstrated that Co-doped ZnTiO₃ films are a hexagonal space group (No. 148), and the lattice constant a increases but c decreases with the increasing Co content. All of the films show weak room temperature ferromagnetic order, and their saturated magnetizations increase slowly with increasing Co composition, which may be related to bound magnetic polarons. The average radius of bound magnetic polaron is approximately 15?Å. The optical parameters of the films were extracted via spectroscopy ellipsometry. At 532?nm, n, defined as the refractive index of the films, gradually increases as the Co increases. With Co content x from 0.00 to 0.10, E_OBG (the optical band gap of the Co-doped ZnTiO₃) decreases from 4.37 to 4.10?eV, S₀ (the average oscillator strength) decreases from 7.90?×?10^?5 to 6.33?×?10^?5?nm^?2, and λ₀ (the average oscillator wavelength) decreases from 0.0156 to 0.0134?nm, but E₀/S₀ (the electro-optical parameter) of the samples increases from 1.01?×?10^?14 to 1.46?×?10^?13 eVm². The present report will be constructive for possible applications of ZnTiO₃ in magnetic-optical devices.     

Investigation on the comparison of the structural,electrical and optical properties between ZCO:Na and ZCO:(Na,N) films synthesized by RF magnetron sputtering

Sodium doped ZnCdO (ZCO:Na) and sodium-nitrogen co-doped ZnCdO [ZCO:(Na, N)] films have been deposited on quartz substrates by radio frequency (RF) magnetron sputtering followed by a post-annealing treatment. The Hall-effect measurement results emphasized the importance of the dopant and annealing conditions in realizing p-type conversion. The ZCO:(Na, N) film annealed at 655 °C for 30 min (denoted sample F) showed optimal p-type conduction properties, which has the carrier concentration of 7.84 × 10¹⁸ cm^?3. Compared to the best p-type conduction of the ZCO:Na film (sample C), sample F reveals an increased carrier concentration (up from 10¹⁷ to 10¹⁸ cm^?3) owing to the formation of Na_Zn and N_o dual acceptors. Furthermore, the XPS results revealed that sample F has a higher Na_Zn acceptor content than sample C. The ZCO:(Na, N) films exhibited better crystal quality compared to the ZCO:Na films based on comparison of the values of full width at half maximum and intensity. It was found that the band gap (E_g) of all ZCO:Na and ZCO:(Na, N) films were smaller than that of pure ZnO due to Cd doping, and that the E_g increased with the increase of T_ann, which is ascribed to the fact that more Cd atoms were evaporated from the films at higher T_ann. In addition, the E_g of the ZCO:(Na, N) films (samples E-G) are generally larger than that of the ZCO:Na films (samples A-D). This is attributed to the incorporation of N in ZCO:(Na, N), as the N_o acceptor impedes the formation of V_o defects, resulting in a decrease in the formation of the Cd_Zn-V_o complex, which in turn decreased the Cd concentration.     

Influence of reaction conditions on the formation of nanotubes/nanoparticles of polyaniline in the presence of 1‐amino‐2‐naphthol‐4‐sulfonic acid and applications as electrostatic charge dissipation material

BACKGROUND: Poly(1‐amino‐2‐naphthol‐4‐sulfonic acid) and its copolymers with aniline are a new class of conducting polymers which can acquire intrinsic protonic doping ability, leading to the formation of highly soluble self‐doped homopolymers and copolymers. Free ? OH and ? NH₂ groups in the polymer chain can combine with other functional groups that could be present in protective paints which can thus be successfully used as antistatic materials. RESULTS: This paper reports the formation of nanotubes of polyaniline on carrying out oxidative polymerization of aniline in the presence of 1‐amino‐2‐naphthol‐4‐sulfonic acid (ANSA) in p‐toluenesulfonic acid (PTSA) as an external dopant. The presence of ? SO₃H groups in the ANSA comonomer allows the copolymer to acquire intrinsic protonic doping ability. The polymerization mechanism was investigated by analysing the ¹H NMR, ¹³C NMR, Fourier transform infrared and X‐ray photoelectron spectra of the copolymers and homopolymers, which revealed the involvement of ? OH/? NH₂ in the reaction mechanism. Scanning and transmission electron microscopy showed how the reaction route and the presence of a dopant can affect the morphology and size of the polymers. Static decay time measurements were also carried out on conducting copolymer films prepared by blending of 1 wt% of copolymers of ANSA and aniline with low‐density polyethylene (LDPE) which showed a static decay time of 0.1 to 0.31 s on dissipating a charge from 5000 to 500 V. CONCLUSION: Copolymers of ANSA with aniline were synthesized in different reaction media, leading to the formation of nanotubes and nanoparticles of copolymer. Blends of 1 wt% of PTSA‐ and self‐doped copolymers of ANSA and aniline with LDPE can be formulated into films with effective antistatic properties. Copyright © 2009 Society of Chemical Industry     

Polypyrrole–poly(heptamethylene p,p′-bibenzoate) conducting materials. Synthesis and characterization

Polypyrrole–poly(heptamethylene p,p′-bibenzoate) conducting materials, PPy–P7MB/ClO₄, were obtained by anodic coupling of pyrrole into a polybibenzoate inert matrix, using perchlorate anions as dopant agent. P7MB is a main-chain liquid crystalline polybibenzoate with adequate mechanical properties and elastic modulus of 1.4GPa at room temperature. The method of synthesis, galvanostatic or potentiostatic electrodeposition, is responsible for differences in the PPy–P7MB/ClO₄ films electrochemical response. FTIR spectra show the complex structures of P7MB and the composite conducting material. The conductivity of PPy–P7MB/ClO₄ films maintains a relatively high value, σ = 13.74Scm^?1, in spite of the insulating effect of polybibenzoate. Film micrographs reveal the typical cauliflower morphology exhibited by polypyrrole and the evolution of film growth with time.     

Tailoring of optical band gap and electrical conductivity in a-axis oriented Ni doped Chromium Oxide thin films

Ni doped Cr₂O₃ (NCO) films have attracted much attention due to their applications in the field of photovoltaics. This study reports the tailoring of structural, electrical and optical properties as a function of Ni doping in Chromium oxide (Cr₂O₃). NCO thin films were grown by Pulsed laser deposition (PLD) using 2nd harmonic Nd:YAG Laser on n-Si (100) with in-situ annealing of 450?°C. Structural analyses based on X-ray diffractometry (XRD) and Raman Spectroscopy showed the inconsistent variation in crystallinity and shift in $A_{1g}$ band in turn revealing the successful incorporation of Ni into Chromium oxide host lattice. In addition, electrical measurements also showed an inconsistent variation in resistivity ranging from 10² to 10⁴$\Omega ?\mathit{cm}$. The properties showed widening of band gap energy (E_g) from 3.41 to 3.60?eV as a function of Ni doping concentration with significantly decreased reflectance in the range of 500–600?nm thereby increasing the absorption, a pre-requisite for solar absorbers.     

Spectroscopic studies of undoped and doped polystyrene films

Spectroscopic (i.r., u.v.) studies of undoped polystyrene and that doped with Acrylic Acid films (30μ thick), prepared by isothermal immersion technique, have been reported. It is found that in the case of i.r. spectra an additional absorption peak appears near 1420cm^?1, whereas those present near 1300 and 980cm^?1, as shoulders in the undoped sample, appear as sharp peaks in the doped samples. In the region 3300–2500cm^?1 a broadening appears in the doped films which increases with the dopant concentration. In the case of u.v. spectra, out of four absorption regions present in the undoped films two bands merge and only three appear in the doped ones. The u.v. absoption increases with the dopant concentration. These results have been explained on the basis of a charge transfer complex formation due to the interaction between the dopant and the polymer matrix.     

Adsorption of perchlorate onto raw and oxidized carbon nanotubes in aqueous solution

Perchlorate (ClO₄^?) is an emerging trace contaminant. The adsorption of ClO₄^? on raw and oxidized carbon nanotubes (CNTs) was investigated to elucidate the affinity mechanism of CNTs with anion pollutants. The adsorption of ClO₄^? into different CNTs increased in the order multi-walled CNTs < single-walled CNTs < double-walled CNTs (DWCNTs). Co-existing anions (SO₄^2?, NO₃^?, Cl^?) significantly weakened ClO₄^? adsorption, while the co-existence of Fe³⁺ and cetyltrimethylammonium cations increased ClO₄^? adsorption 2- to 3-fold. ClO₄^? adsorption was promoted by oxidized DWCNTs due to the introduction of more oxygen-containing functional groups, which served as additional adsorption sites. The pH values significantly affected the zeta potential of raw and oxidized DWCNTs and thus ClO₄^? adsorption. The pH-dependent curves of ClO₄^? adsorption on CNTs were distinct from those of conventional sorbents (e.g., activated carbon and resin). Maximum ClO₄^? adsorption occurred at pH = the isoelectric point (pH_IEP) + 0.85 rather than at pH < pH_IEP, which cannot be explained by electrostatic interactions alone. Hydrogen bonding is proposed to be a dominant mechanism at neutral pH for the interaction of ClO₄^? with CNTs, and variations of ClO₄^? affinity with CNTs in different pH ranges are illustrated.     

Ultrasound assisted synthesis of Gd and Nd doped ceria electrolyte for solid oxide fuel cells

In this study, the ceramic powders of Ce_1?xGd_xO_2?x/2 and Ce_1?xNd_xO_2?x/2 (x=0.05, 0.10, 0.15, 0.20 and 0.25) were synthesized by ultrasound assisted co-precipitation method. The ionic conductivity was studied as a function of dopant concentration over the temperature range of 300–800 °C in air, using the impedance spectroscopy. The maximum ionic conductivity, σ_800 °C=4.01×10^?2 Scm^?1 with the activation energy, E_a=0.828 kJmol^?1 and σ_800 °C=3.80×10^?2 Scm^?1 with the activation energy, E_a=0.838 kJmol^?1 were obtained for Ce_0.90Gd_0.10O_1.95 and Ce_0.85Nd_0.15O_1.925 electrolytes, respectively. The average grain size was found to be in the range of 0.3–0.6 μm for gadolinium doped ceria and 0.2–0.4 μm for neodymium doped ceria. The uniformly fine crystallite sizes (average 12–13 nm) of the ultrasound assisted prepared powders enabled sintering of the samples into highly dense (over 95%) ceramic pellets at 1200 °C (5 °C min^?1) for 6 h.     

Assembly of high-performance hybrid supercapacitors using FeCo2O4 microflowers as battery-type cathode materials

In this work, FeCo₂O₄ microflowers (MFs) and microparticles (MPs) were respectively prepared at different temperatures via a wet chemical method, along with a post annealing treatment in air. These MFs and MPs exhibited huge specific surface area and a large number of mesopores. Several electrochemical tests were conducted in a three-electrode configuration. The FeCo₂O₄ MFs delivered a specific capacity of 301.3C g^?1, higher than 253.9C g^?1 for FeCo₂O₄ MPs. A hybrid supercapacitor (HSC) device was assembled with FeCo₂O₄ as cathode and activated carbon (AC) as anode to investigate the practical applications in electrochemical energy storage. The FeCo₂O₄ MFs//AC HSC delivered a capacity of 107.2C g^?1 at 1 A g^?1 and an energy density (E_d) of 25.7 W h kg^?1 at 862.6 W kg^?1, respectively, while the FeCo₂O₄ MPs//AC HSC showed an E_d of 23.8 W h kg^?1 at the power density (P_d) of 878.9 W kg^?1. The two HSCs showed little capacity decay after 3000 cycles at 6 A g^?1. The capacity of FeCo₂O₄ MFs and the obtained E_d of HSC were in a high status among those of transition metal oxides (TMOs)-based electrodes reported earlier. The current synthetic strategy can be used as a reference to the synthesis of other similar electrochemical materials for HSC electrodes.     

Free‐standing aniline oligomer functionalized multiwalled carbon nanotube films from a filtration method

High electrochemical active free‐standing multiwalled carbon nanotube (MWNT) films have been synthesized from aniline oligomer functionalized MWNTs (MWNT‐AO), by using filtration of the acidic phosphate ester (APE) doped MWNT‐AO dispersions. The homogeneously distributed MWNTs endowed APE/MWNT films automatically releasing from the filter membrane. The sheet resistivity of MWNT‐AO (850 Ω sq^?1) showed a lower value than that of carboxyl MWNTs (1273 Ω sq^?1), due to the doping effect of MWNT on aniline oligomer, confirmed by the N1s X‐ray photoelectron spectrum. However, it showed a higher sheet resistivity value of 1526 Ω sq^?1 after further doped by APE, because of the presence of unreacted dopant. After removing the residual insulating dopant by the vacuum filtration, the resultant APE/MWNT films showed the sheet resistivity value as low as 131 Ω sq^?1. Thermogravimetric analysis showed that the MWNT loading in the film can be over than 77%, which showed the specific capacitance as high as 249 F g^?1. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40259.     

Salt effect on the conformation of an alternating copolymer of l-leucine and l-lysine

The ‘statistical’ copoly(l-leucyl-l-lysine) is shown to undergo a coil to α-helix transition by either adding salt or raising the pH. However, the corresponding alternating copolymer undergoes a conformational transition from a coil to a b-structure, which is accomplished by adding various salts or by raising the pH. The b-structure fraction of the alternating copoly(l-leucyl—l-lysine) is especially enhanced by either water structure, breaking or making anion (e.g., ClO^?₄ or SO^2?₄), in which the β-structure may be induced by a different molecular mechanism. As a consequence of the strong shielding effect due to the specific binding of ClO^?₄ with charged side chain as well as its electrochemical monovalency, an intramolecular cross-β-structure is formed at lower salt concentration (e.g., 0.10 moll^?1). However, in the presence of SO^2?₄, due to its divalency, intermolecular β-pleated sheet structure occurs even at very low salt concentration (e.g., 0.002 moll^?1). Furthermore, in both cases the resulting β-structure is stable up to 90°C.     

Development and Study of Solid Polymer Electrolyte Based on Polyvinyl Alcohol: Mg(ClO4)2

Magnesium ion-conducting solid polymer electrolytes consisting of polyvinyl alcohol with magnesium perchlorate (Mg(ClO₄)₂) as electrolytic salt have been developed and their experimental investigations are reported. The solid polymer electrolytes have been prepared by well-known solution casting method using double-distilled water as a solvent. The highest room temperature conductivity of the order of 10^?4 S cm^?1 was obtained for the solid polymer electrolyte with the composition 80?mol% polyvinyl alcohol:20?mol% Mg(ClO₄)₂. The pattern of the temperature-dependent conductivity shows Arrhenius behavior. The Fourier transform infrared spectroscopy analysis confirms the complex formation of the polymer with the salt. The X-ray diffraction results reveal that the crystalline phase of polymer host has completely changed on the addition of dopant. Differential scanning calorimetry studies show a decrease in melting temperature of the polyvinyl alcohol with the increasing dopant concentration. The real part of dielectric permittivity shows a strong dispersion at lower frequencies, which implies the space charge effects arising from the electrodes. The loss tangent spectrum reveals that the jumping probability per unit time decreases with the increasing salt concentration. The total ionic transference number measured has been found to be in the range of 0.92–0.94 for all the polymer electrolyte systems. The result reveals that the conducting species are predominantly ions. The solid polymer electrolyte with highest conductivity showed an electrochemical stability of 2?V. The results obtained by cyclic voltammetry on stainless steel/solid polymer electrolyte/stainless steel, Mg/solid polymer electrolyte/Mg symmetrical cells show evidence for reversibility.     

Synthesis and enhanced photocatalytic activity of Mn/TiO2 mesoporous materials using the impregnation method through CVC process

TiO₂ particles were prepared by chemical vapor condensation and used to synthesize MnO_x/TiO₂ mesoporous materials by impregnation. The Mn-doped TiO₂ particles were smaller (8.5?nm vs. 10.5?nm) and had greater surface areas (203.7?m²?g^?1 vs. 134.4?m²?g^?1) than undoped particles. They were also smaller and had a greater surface area than similarly doped commercial P25, indicating highly dispersed Mn species on the surfaces of the crystalline TiO₂. The resulting materials?? photocatalytic activities towards methylene blue decomposition were compared: the synthesized TiO₂ particles with MnO₂ showed higher photocatalytic activity than the similarly doped commercial P25.     

Study of Phosphorus Doped Micro/Nano Crystalline Silicon Films Deposited by Filtered Cathodic Vacuum Arc Technique

Phosphorus doped micro/nano crystalline silicon thin films have been deposited by the filtered cathodic vacuum arc technique at different substrate temperatures (T_s) ranging from room temperature (RT) to 350 ^°C. The films have been characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy, secondary ion mass spectroscopy, dark conductivity ( σ _D), activation energy ( ΔE) and optical band gap (E _g). The XRD patterns show that the RT grown film is amorphous in nature but high T_s (225 and 350 ^°C) deposited films have a crystalline structure with (111) and (220) crystal orientation. The crystallite size of the higher T_s grown silicon films evaluated was between 17 to 31 nm. Raman spectra reveal the amorphous nature of the film deposited at RT whereas higher T_s deposited films show a higher crystalline nature. The crystalline volume fraction of the silicon film deposited at higher T_s was estimated as 65.7 % and 74.4 %. The values of σ _D, ΔE and E _g of the silicon films deposited at different T_s were found to be in the range of 8.84 x 10 ^?4? 0.98 ohm ^?1 cm ^?1, 0.06 - 0.31 eV and 1.31-1.93 eV, respectively. A n-type nc-Si/p-type c-Si heterojunction diode was fabricated which showed the diode ideality factor between 1.1 to 1.5.     

Solution Synthesis of BiFeO3 Thin Films onto Silicon Substrates with Ferroelectric,Magnetic, and Optical Functionalities

Single‐BiFeO₃ perovskite films onto Pt‐coated silicon substrates have been fabricated by chemical solution deposition using a synthesis strategy based on the use of nonhazardous reagents. Different routes were tested to obtain precursors for the deposition of the films, inferring that bismuth (III) nitrate and iron (III) 2,4‐pentanedionate dissolved in acetic acid and 1,3‐propendiol led to the best solution. Ferroelectric, magnetic, and optical functionalities were demonstrated in these films, obtaining a high ferroelectric polarization at room temperature, ~67 μC × cm^?2, a dependence of the magnetization with the film thickness, 0.60 and 2.50 emu × g^?1 for the ~215 and ~42‐nm‐thick films, and a direct band gap in the visible range, E_g ~2.82 eV. These results support the interest of solution methods for the fabrication of BiFeO₃ thin films onto the silicon substrates required in microelectronic devices.     

Oxygen hyper stoichiometric trimetallic titanium doped magnesium ferrite: Structural and photocatalytic studies

Oxygen hyper stoichiometric titanium doped magnesium ferrite, Mg_1-xTi_xFe₂O_4+δ (x = 0–1.0) nanoparticles (NPs) were synthesized using sol-gel method. XRD analysis revealed a decrease in the lattice parameter from 8.9 to 8.3 Å and confirmed the incorporation of Ti⁴⁺, a smaller ionic radius dopant. Presence of M-O vibrational bands at tetrahedral and octahedral sites were authenticated by FT-IR analysis. The observed reduction in saturation magnetization values from 23.3 emug^?1 to 18.3 emug^?1 was ascribed to the doping of non-magnetic Ti⁴⁺ ions in MgFe₂O₄ NPs. BET studies corroborated the mesoporous nature of the NPs and doped ferrite NPs displayed larger surface area (53.0–73.0 m²g^-1) as compared to pristine ferrite NPs (32.8–39.0 m²g^-1). Optical studies displayed red shift in the absorption edge of the Ti⁴⁺ doped MgFe₂O₄ NPs in contrast to pristine NPs. Oxygen hyper stoichiometry in the doped ferrite NPs was determined experimentally. Photoluminescence emission spectra exhibited reduction in the emission intensity in case of Ti⁴⁺ doped NPs which supported their higher light capturing potential. Among synthesized doped ferrite NPs Mg_0.5Ti_0.5Fe₂O_4.5 NPs exhibited maximum (98%) photodegradation capacity for rhodamine B. The ^?O₂^? and ^?OH were the main reactive species in the photodegradation. The present studies have clearly shown the potential of tuning the composition of oxygen hyper stoichiometric ferrite Mg_0.5Ti_0.5Fe₂O_4.5 for the removal of toxic organic contaminants from water.