还原氧化石墨烯/碳纳米管透明导电薄膜的制备及性能研究

使用天然植物多酚——单宁酸(TA)作为氧化石墨烯(GO)的还原剂,通过"一步法"实现了对GO的绿色还原和功能化.随后,将TA还原氧化石墨烯(RGO)和碳纳米管(SWCNT)结合起来,共同构筑具有三维结构的石墨烯/单壁碳纳米管(RGO/SWCNT)透明导电薄膜(TCFs).该薄膜有着良好的导电性(透光率为75.1％时,面...     

Preparation of transparent and conductive cellulose nanocrystals/graphene nanoplatelets films

The manufacture of emerging products such as photovoltaic devices requires combinations of various novel materials to be leveraged into successful, scalable approach. In order to develop new electronic devices, it is necessary to find innovative solutions to the eco-sustainability problem of materials as substrates for circuits. We report on the demonstration of polymer solar cells fabricated on optically transparent and conductive graphene nanoplatelets (GNPs)–cellulose nanocrystals (CNC) film. The solar cells fabricated on the GNPs/CNC films display good rectification in the dark. Such GNPs–CNC functional films are expected to be attractive for eco-friendly electronics.     

氧化锌掺钇透明导电薄膜的制备及光电特性研究

采用射频磁控溅射法,室温下在玻璃衬底上制备出了具有良好附着性、低电阻率和高透过率的新型透明导电薄膜YZO(ZnO掺杂Y2O3简称YZO)。在薄膜厚度为600nm的情况下,研究了薄膜电学特性随溅射功率和溅射气压的变化情况。X射线衍射谱表明YZO薄膜是多晶膜,具有ZnO的六角纤锌矿结构,最佳取向为(002)方向。最佳溅射条件下制备的薄膜电阻率为8.71×10-4Ω.cm,在可见光范围内平均透过率达到92.3%,禁带宽度为3.57eV。     

Mechanical integrity of transparent conductive oxide films for flexible polymer-based displays

The mechanical integrity of tin-doped indium oxide (ITO) thin films sputtered onto a high temperature aromatic polyester developed for flexible display applications was investigated by means of tensile experiments equipped with electrical measurement, and carried out in-situ in an optical microscope. Attention was paid to the influence of ITO thickness, composition and crystalline microstructure, internal stress, annealing, and polymer substrate. It was observed that process-induced internal stresses were systematically compressive, and that tensile cracks in the ITO always initiated at pin-hole defect sites. A transition from stable to unstable crack growth was detected when crack length was several 100 times coating thickness. The occurrence of such a transition, which corresponded to an increase in electrical resistance equal to approximately 10%, indicated that crack propagation controlled the loss of functional performance of the device. It was moreover found that an improved surface quality of the polymer substrate, such as that obtained with planarization hard coats, was a major factor to increase the cohesive properties of ITO thin films. It was also observed that the intrinsic crack onset strain followed classic fracture mechanics scaling, in inverse proportion to the square root of ITO thickness.     

Preparation and properties of p-type transparent conductive Cu-doped NiO films

The NiO-Cu composite films with various Cu contents of 0-18.17 at.% are deposited on a glass substrate. An ultra high electrical resistivity (ρ) is obtained and cannot be detected by a four point probe measurement when the Cu content in the films is lower than 6.97 at.%. The ρ value is reduced significantly to 35.8 Ω-cm as Cu content is increased to 9.18 at.%, and it further decreases to 0.02 Ω-cm when the Cu content further increases to 18.17 at.%. The Hall measurement for all Cu-doped NiO films shows p-type conduction. In addition, the transmittance of NiO films also decreases continuously from 96% to 43% as Cu content increases from 0 to 18.17 at.%. The XRD patterns of Cu-doped NiO films show that only NiO peaks appear and the crystallinity of NiO films degrades as Cu content exceeds 6.97 at.%. A large amount of lattice sites of Ni²⁺ ions in a NiO crystallite is replaced by the Cu⁺ ions that lead to p-type conduction and result in the degradation of crystallinity for NiO-Cu composite films that have a higher Cu content.     

Preparation and characterization of transparent/conductive nano-composites films

Polymer-embedding of nano-sized indium tin oxide (SnO·In₂O₃, ITO) produces electrically conductive materials transparent to the visible light at filling factors higher than the percolation threshold. ITO powders are commercially available in an aggregated form and a disaggregation technique was required. Here, aggregated ITO nanoparticles were transformed to colloidal suspension by high-speed stirring. This finely dispersed ceramic suspension was stabilized by addition of poly(vinyl pyrrolidone) and the obtained colloidal system was cast on an optical-grade substrate (PET) to produce electrically conductive-transparent nanocomposite films. Preliminary mechanical and electrical characterization of these films showed good conductivity and interfacial properties.     

氧化物透明导电膜的研究进展

介绍了透明导电薄膜主要的种类及发展过程,对氧化物透明导电薄膜的不同的制备工艺作了比较,并概括了氧化物透明导电薄膜的应用领域;在对氧化物透明导电薄膜的最新研究进展进行综合评述的同时,提出了透明导电薄膜的研究方向和目前亟待解决的问题.     

Continuous production of flexible carbon nanotube-based transparent conductive films

This work shows a simple, single-stage, scalable method for the continuous production of high-quality carbon nanotube-polymer transparent conductive films from carbon feedstock. Besides the ease of scalability, a particular advantage of this process is that the concentration of nanotubes in the films, and thus transparency and conductivity, can be adjusted by changing simple process parameters. Therefore, films can be readily prepared for any application desired, ranging from solar cells to flat panel displays. Our best results show a surface resistivity of the order of 300 Ω square^-1 for a film with 80% transparency, which is promising at this early stage of process development.     

绒面ZAO透明导电膜的制备工艺研究

绒面ZAO(ZnO∶Al,氧化锌铝)透明导电膜在硅基薄膜太阳能电池领域应用前景广阔,本文利用直流磁控溅射方法,采用氧化锌铝陶瓷靶材制备了ZAO透明导电膜,并用自制的腐蚀液对膜层进行腐蚀以便形成太阳能电池所需要的表面凹凸起伏的绒面结构。研究了不同镀膜温度对膜层性能的影响,不同退火条件下膜层热稳定性的变化情况,不同腐蚀时间下膜层电阻、透过率以及表面形貌的变化,结果表明,在相同真空度、溅射功率和节拍的情况下,220℃下制备的ZAO透明导电膜膜层性能最好,腐蚀时间为30 s时获得的绒面效果好。     

Continuous production of flexible carbon nanotube-based transparent conductive films

Abstract

This work shows a simple, single-stage, scalable method for the continuous production of high-quality carbon nanotube-polymer transparent conductive films from carbon feedstock. Besides the ease of scalability, a particular advantage of this process is that the concentration of nanotubes in the films, and thus transparency and conductivity, can be adjusted by changing simple process parameters. Therefore, films can be readily prepared for any application desired, ranging from solar cells to flat panel displays. Our best results show a surface resistivity of the order of 300 Ω square^-1 for a film with 80% transparency, which is promising at this early stage of process development.     

热处理气氛对ZnO透明导电膜性能的影响

采用溶胶-凝胶法、在空气、Ar气、H2气中热处理制备Al3+、F-掺杂的致密ZnO薄膜.利用XRD、SEM、分光光度计和四探针测试仪对薄膜性质进行表征.研究表明,强还原性H2气处理促进了薄膜晶界中吸附氧的解吸,减少了晶界处缺陷数目,有利于薄膜晶化程度和载流子浓度提高,所制得掺杂ZnO薄膜最低方阻为10Ω/□,在可见光范围内的达透射率在可达90%以上,性能接近ITO导电薄膜.     

Large-area ultrathin films of reduced graphene oxide as a transparent and flexible electronic material

The integration of novel materials such as single-walled carbon nanotubes and nanowires into devices has been challenging, but developments in transfer printing and solution-based methods now allow these materials to be incorporated into large-area electronics. Similar efforts are now being devoted to making the integration of graphene into devices technologically feasible. Here, we report a solution-based method that allows uniform and controllable deposition of reduced graphene oxide thin films with thicknesses ranging from a single monolayer to several layers over large areas. The opto-electronic properties can thus be tuned over several orders of magnitude, making them potentially useful for flexible and transparent semiconductors or semi-metals. The thinnest films exhibit graphene-like ambipolar transistor characteristics, whereas thicker films behave as graphite-like semi-metals. Collectively, our deposition method could represent a route for translating the interesting fundamental properties of graphene into technologically viable devices.     

柔性透明导电膜衬底材料的研究进展

综述了柔性透明导电膜材料的应用以及可用作柔性透明导电膜衬底材料的种类、存在的问题和可行的解决方法。介绍了柔性透明导电膜材料的优点、应用和国内外研究现状。重点介绍了可用作柔性透明导电膜衬底的聚合物材料—聚酰亚胺和聚酯,分析了各自的特点。通过分析柔性衬底存在的不足,寻求可行的解决方法,使柔性衬底可以更好地满足导电膜对衬底材料的要求,为柔性衬底材料的设计提供依据。     

Effect of carbon nanotubes shape on the properties of multiwall carbon nanotubes/polyethylene flexible transparent conductive films

Transparent conductive material is used in a wide range of applications and is particularly interesting. In the present work, a series of multiwall carbon nanotubes/low density polyethylene nanocomposites with different carbon nanotubes were prepared via solution casting method. The optical transparency, morphology, and resistivity of transparent conductive films have been characterized by using UV–Vis Spectrophotometer, Field emission scanning electron microscope and Multimeter, respectively. Their electrically conductive and optically transparent properties were studied and compared. The result showed that thinner and longer multiwall carbon nanotubes were more suitable for the fabrication of flexible transparent conductive nanocomposites. The sample filled with 1 wt% of T.1 (outside diameter <8 nm, length 10–30 μm) had good transparent conductive properties (volume conductivity of 3.12 × 10^?3 S m^?1 and optical transmittance of 62.8 % at the light wavelength of 600 nm). The high volume conductivity and optical transparency demonstrated that such kind of nanocomposite films had favorable potential in the applications from electromagnetic interference shielding to transparent electrodes.     

Nanostructuring thin Au films on transparent conductive oxide substrates

Fabrication processes of Au nanostructures on indium-tin-oxide (ITO) surface by simple, versatile, and low-cost bottom-up methodologies are investigated in this work. A first methodology exploits the patterning effects induced by nanosecond laser irradiations on thin Au films deposited on ITO surface. We show that after the laser irradiations, the Au film break-up into nanoclusters whose mean size and surface density are tunable by the laser fluence. A second methodology exploits, instead, the patterning effects of standard furnace thermal processes on the Au film deposited on the ITO. We observe, in this case, a peculiar shape evolution from pre-formed nanoclusters during the Au deposition stage on the ITO, to holed nanostructures (i.e. nanorings), during the furnace annealing processes. The nanorings depth, height, width, and surface density are shown to be tunable by annealing temperature and time.     

柔性聚酰亚胺(PI)衬底上ITO薄膜的生长及其透明导电性能影响机制研究

采用直流磁控溅射法在聚酰亚胺(PI)柔性衬底上生长氧化铟锡(ITO)薄膜,采用XP-2探针台阶仪、X射线衍射(XRD)、霍尔测试仪、紫外-可见分光光度计等对ITO薄膜进行结构和光电性能表征.结果表明溅射功率和沉积气压是影响磁控溅射法生长ITO薄膜透明导电性能的主要因素,实验系统研究了溅射功率和沉积气压对ITO薄膜透明导...     

Pentacene ohmic contact on the transparent conductive oxide films

Low-resistance ohmic contacts are essential to improve the performance of pentacene-based electronic and optoelectronic devices. In this study, we reported ohmic contact formation at the indium tin oxide (ITO)/pentacene and indium cerium oxide (ICO)/pentacene interfaces. According to the observed results from current-voltage and Kelvin probe measurements, we found that the lower contact resistivity of the ICO/pentacene sample than the ITO/pentacene sample may be attributed to the higher surface work function of ICO than ITO.     

The properties of transparent conductive In-Ga-Zn oxide films produced by pulsed laser deposition

To obtain TCO films for wavelengths shorter than the visible range, Ga₂O₃ was added to the In₂O₃-ZnO system as an impurity. Using pulsed laser deposition (PLD), two kinds of targets, InGaZnO₄ and InGaZn₃O_6, were deposited. Although the In-Ga-Zn-O films obtained deviated from the stoichiometry of InGaZnO₄, they were amorphous at a substrate temperature below 250 °C. We obtained the lowest resistivity of 2.77 × 10⁻³ Ω cm within the present experiment at a carrier concentration of 1.38 × 10²⁰ cm⁻³ and a Hall mobility of 16.6 cm²/Vs. The optical band gap energy shifted to higher energies and the transmittance at the blue range was improved dramatically as compared with similar amorphous IZO films.     

功能氧化石墨烯/热塑性聚氨酯复合材料薄膜的制备及阻隔性能

为了提高热塑性聚氨酯(TPU)的阻隔性能,首先,采用溶液成型的方法在涂膜机上制备了功能氧化石墨烯(IP-GO)/TPU复合材料薄膜。然后,利用FTIR、XPS、XRD、FE-SEM、原子力显微镜和氧气透过仪对IP-GO/TPU复合材料的形貌和性能进行了表征。结果表明:IP-GO层间距相对原始鳞片石墨的增加了0.696nm,片层的厚度为1.2nm左右。IP-GO以褶皱层状的形式均匀分散在TPU基体中,并且包覆在复合材料薄膜断口表面。当IP-GO含量为3wt%时,IP-GO/TPU复合材料薄膜的氧气透过率为84.325cm3/(m2·d·Pa),相比纯TPU薄膜的280.973cm3/(m2·d·Pa)下降了70%,阻隔性能明显提高。研究解决了TPU薄膜阻隔性能不佳的问题,为高阻隔聚合物的制备提供了一种思路和方法。