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排序方式: 共有460条查询结果,搜索用时 39 毫秒
61.
Simge Uzun Marion Schelling Kanit Hantanasirisakul Tyler S. Mathis Ron Askeland Genevieve Dion Yury Gogotsi 《Small (Weinheim an der Bergstrasse, Germany)》2021,17(1):2006376
Direct printing of functional inks onto flexible substrates allows for scalable fabrication of wearable electronics. However, existing ink formulations for inkjet printing require toxic solvents and additives, which make device fabrication more complex, limit substrate compatibility, and hinder device performance. Even water-based carbon or metal nanoparticle inks require supplemental surfactants, binders, and cosolvents to produce jettable colloidal suspensions. Here, a general approach is demonstrated for formulating conductive inkjet printable, additive-free aqueous Ti3C2Tx MXene inks for direct printing on various substrates. The rheological properties of the MXene inks are tuned by controlling the Ti3C2Tx flake size and concentration. Ti3C2Tx-based electrical conduits and microsupercapacitors (MSCs) are printed on textile and paper substrates by optimizing the nozzle geometry for high-resolution inkjet printing. The chemical stability and electrical properties of the printed devices are also studied after storing the devices for six months under ambient conditions. Current collector-free, textile-based MSCs show areal capacitance values up to 294 mF cm−2 (2 mV s−1) in poly(vinyl alcohol)/sulfuric acid gel electrolyte, surpassing reported printed MXene-based MSCs and inkjet-printed MSCs using other 2D nanomaterials. This work is an important step toward increasing the functional capacity of conductive inks and simplifying the fabrication of wearable textile-based electronics. 相似文献
62.
Meikang Han Yuqiao Liu Roman Rakhmanov Christopher Israel Md Abu Saleh Tajin Gary Friedman Vladimir Volman Ahmad Hoorfar Kapil R. Dandekar Yury Gogotsi 《Advanced materials (Deerfield Beach, Fla.)》2021,33(1)
Highly integrated, flexible, and ultrathin wireless communication components are in significant demand due to the explosive growth of portable and wearable electronic devices in the fifth‐generation (5G) network era, but only conventional metals meet the requirements for emerging radio‐frequency (RF) devices so far. Here, it is reported on Ti3C2Tx MXene microstrip transmission lines with low‐energy attenuation and patch antennas with high‐power radiation at frequencies from 5.6 to 16.4 GHz. The radiation efficiency of a 5.5 µm thick MXene patch antenna manufactured by spray‐coating from aqueous solution reaches 99% at 16.4 GHz, which is about the same as that of a standard 35 µm thick copper patch antenna at about 15% of its thickness and 7% of the copper weight. MXene outperforms all other materials evaluated for patch antennas to date. Moreover, it is demonstrated that an MXene patch antenna array with integrated feeding circuits on a conformal surface has comparable performance with that of a copper antenna array at 28 GHz, which is a target frequency in practical 5G applications. The versatility of MXene antennas in wide frequency ranges coupled with the flexibility, scalability, and ease of solution processing makes MXene promising for integrated RF components in various flexible electronic devices. 相似文献
63.
Chuangang Hu Yi Lin John W. Connell Hui‐Ming Cheng Yury Gogotsi Maria‐Magdalena Titirici Liming Dai 《Advanced materials (Deerfield Beach, Fla.)》2019,31(13)
Owing to their high earth‐abundance, eco‐friendliness, high electrical conductivity, large surface area, structure tunability at the atomic/morphological levels, and excellent stability in harsh conditions, carbon‐based metal‐free materials have become promising advanced electrode materials for high‐performance pseudocapacitors and metal–air batteries. Furthermore, carbon‐based nanomaterials with well‐defined structures can function as green catalysts because of their efficiency in advanced oxidation processes to remove organics in air or from water, which reduces the cost for air/water purification and avoids cross‐contamination by eliminating the release of heavy metals/metal ions. Here, the research and development of carbon‐based catalysts in supercapacitors and batteries for clean energy storage as well as in air/water treatments for environmental remediation are reviewed. The related mechanistic understanding and design principles of carbon‐based metal‐free catalysts are illustrated, along with the challenges and perspectives in this emerging field. 相似文献
64.
Vladimir Chepelev Yury Parfenov William Radasky Boris Titov Leonid Zdoukhov Kejie Li Yuhao Chen Xu Kong Yan-zhao Xie 《Journal of Electronic Testing》2018,34(5):547-557
In this paper, we have considered a methodical approach to forecast the consequences of the influence of pulsed electromagnetic fields on electronic devices based on three defined conditions of the disruption of device functioning. The approach is based on the use of key parameters of pulse disturbances in critical circuits of electronic devices. Depending on the problem being solved and features of the object being tested, the key parameters can be: the amplitude of a voltage pulse in a critical circuit of an object; the Joule integral; the energy; the frequency of repetition of influencing pulses; the probability of a bit error; the number of errors in a transferred data packet; the data rate, etc. 相似文献
65.
Inkjet Printing of Self‐Assembled 2D Titanium Carbide and Protein Electrodes for Stimuli‐Responsive Electromagnetic Shielding
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Mert Vural Abdon Pena‐Francesch Joan Bars‐Pomes Huihun Jung Hemanth Gudapati Christine B. Hatter Benjamin D. Allen Babak Anasori Ibrahim T. Ozbolat Yury Gogotsi Melik C. Demirel 《Advanced functional materials》2018,28(32)
2D titanium carbides (MXene) possess significant characteristics including high conductivity and electromagnetic interference shielding efficiency (EMI SE) that are important for applications in printed and flexible electronics. However, MXene‐based ink formulations are yet to be demonstrated for proper inkjet printing of MXene patterns. Here, tandem repeat synthetic proteins based on squid ring teeth (SRT) are employed as templates of molecular self‐assembly to engineer MXene inks that can be printed as stimuli‐responsive electrodes on various substrates including cellulose paper, glass, and flexible polyethylene terephthalate (PET). MXene electrodes printed on PET substrates are able to display electrical conductivity values as high as 1080 ± 175 S cm?1, which significantly exceeds electrical conductivity values of state‐of‐the‐art inkjet‐printed electrodes composed of other 2D materials including graphene (250 S cm?1) and reduced graphene oxide (340 S cm?1). Furthermore, this high electrical conductivity is sustained under excessive bending deformation. These flexible electrodes also exhibit effective EMI SE values reaching 50 dB at films with thicknesses of 1.35 µm, which mainly originate from their high electrical conductivity and layered structure. 相似文献
66.
Joseph Halim Sankalp Kota Maria R. Lukatskaya Michael Naguib Meng‐Qiang Zhao Eun Ju Moon Jeremy Pitock Jagjit Nanda Steven J. May Yury Gogotsi Michel W. Barsoum 《Advanced functional materials》2016,26(18):3118-3127
Large scale synthesis and delamination of 2D Mo2CT x (where T is a surface termination group) has been achieved by selectively etching gallium from the recently discovered nanolaminated, ternary transition metal carbide Mo2Ga2C. Different synthesis and delamination routes result in different flake morphologies. The resistivity of free‐standing Mo2CT x films increases by an order of magnitude as the temperature is reduced from 300 to 10 K, suggesting semiconductor‐like behavior of this MXene, in contrast to Ti3C2T x which exhibits metallic behavior. At 10 K, the magnetoresistance is positive. Additionally, changes in electronic transport are observed upon annealing of the films. When 2 μm thick films are tested as electrodes in supercapacitors, capacitances as high as 700 F cm?3 in a 1 m sulfuric acid electrolyte and high capacity retention for at least 10,000 cycles at 10 A g?1 are obtained. Free‐standing Mo2CT x films, with ≈8 wt% carbon nanotubes, perform well when tested as an electrode material for Li‐ions, especially at high rates. At 20 and 131 C cycling rates, stable reversible capacities of 250 and 76 mAh g?1, respectively, are achieved for over 1000 cycles. 相似文献
67.
68.
Wysocki G Bakhirkin Y So S Tittel FK Hill CJ Yang RQ Fraser MP 《Applied optics》2007,46(33):8202-8210
The development of an interband cascade laser (ICL) based spectroscopic trace-gas sensor for the simultaneous detection of two atmospheric trace gases is reported. The sensor performance was evaluated using two ICLs capable of targeting formaldehyde (H2CO) and ethane (C2H6). Minimum detection limits of 3.5 ppbV for H2CO and 150 pptV for C2H6 was demonstrated with a 1 s integration time. The sensor was deployed for field measurements of H2CO, and laboratory quantification of both formaldehyde and ethane are reported. A cross comparison of the atmospheric concentration data for H2CO with data collected by a collocated commercial H2CO sensor employing Hantzsch reaction based fluorometric detection was performed.These results show excellent agreement between these two different approaches for trace-gas quantification. In addition, laboratory experiments for dual gas quantification show accurate, fast response with no crosstalk between the two gas channels. 相似文献
69.
Gulyaev YV 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2007,54(7):1382-1385
Dispersion curves, surface displacements, and displacement profiles over the plate thickness are numerically calculated for acoustic plate modes, propagating in fused and Y-rotated, X-cut quartz samples with thickness h/lambda in the range 0-4.5 (h, thickness; lambda, wavelength). The Anisimkin Jr.' modes with velocity v(n) close to that of longitudinal bulk wave v(L) and the dominant longitudinal displacement u1 distributed uniformly through the plate thickness are found in quartz crystals with cut angles mu = 120 degrees-140 degrees and plate thickness h/lambda = 0-0.36, 0.94-1.78, 2.32-3.08, and 3.64-4.44. The same modes in fused quartz are not found, except in a narrow region near zero thickness. 相似文献
70.
Nabiev I Mitchell S Davies A Williams Y Kelleher D Moore R Gun'ko YK Byrne S Rakovich YP Donegan JF Sukhanova A Conroy J Cottell D Gaponik N Rogach A Volkov Y 《Nano letters》2007,7(11):3452-3461
We use high content cell analysis, live cell fluorescent imaging, and transmission electron microscopy approaches combined with inhibitors of cellular transport and nuclear import to conduct a systematic study of the mechanism of interaction of nonfunctionalized quantum dots (QDs) with live human blood monocyte-derived primary macrophages and cell lines of phagocytic, epithelial, and endothelial nature. Live human macrophages are shown to be able to rapidly uptake and accumulate QDs in distinct cellular compartment specifically to QDs size and charge. We show that the smallest QDs specifically target histones in cell nuclei and nucleoli by a multistep process involving endocytosis, active cytoplasmic transport, and entering the nucleus via nuclear pore complexes. Treatment of the cells with an anti-microtubule agent nocodazole precludes QDs cytoplasmic transport whereas a nuclear import inhibitor thapsigargin blocks QD import into the nucleus. These results demonstrate that the nonfunctionalized QDs exploit the cell's active transport machineries for delivery to specific intranuclear destinations. 相似文献