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Ramūnas Aleksiejūnas, Žydrūnas Podlipskas, Saulius Nargelas, Arūnas Kadys, Marek Kolenda, Kazimieras Nomeika, Jūras Mickevičius, Gintautas Tamulaitis
Indium nitride has a good potential for infrared optoelectronics, yet it suffers from fast nonradiative recombination, the true origin of which has not been established with certainty. The diffusion length of free carriers at high densities is not well investigated either. Here, we study carrier recombination and diffusion using the light-induced transient grating technique in InN epilayers grown by pulsed MOCVD on c-plane sapphire. We show that direct Auger recombination governs the lifetime of carriers at densities above ~1018  cm-3 ...
March 15, 2018: Scientific Reports
Turash Haque Pial, Tawfiqur Rakib, Satyajit Mojumder, Mohammad Motalab, M A Salam Akanda
The mechanical properties of indium phosphide (InP) nanowires are an emerging issue due to the promising applications of these nanowires in nanoelectromechanical and microelectromechanical devices. In this study, molecular dynamics simulations of zincblende (ZB) and wurtzite (WZ) crystal structured InP nanowires (NWs) are presented under uniaxial tension at varying sizes and temperatures. It is observed that the tensile strengths of both types of NWs show inverse relationships with temperature, but are independent of the size of the nanowires...
March 14, 2018: Physical Chemistry Chemical Physics: PCCP
Yu-Hung Kuo, Roger Magnusson, Elena Alexandra Serban, Per Sandström, Lars Hultman, Kenneth Järrendahl, Jens Birch, Ching-Lien Hsiao
The influence of structural configurations of indium aluminum nitride (InAlN) nanospirals, grown by reactive magnetron sputter epitaxy, on the transformation of light polarization are investigated in terms of varying structural chirality, growth temperatures, titanium nitride (TiN) seed (buffer) layer thickness, nanospiral thickness, and pitch. The handedness of reflected circularly polarized light in the ultraviolet-visible region corresponding to the chirality of nanospirals is demonstrated. A high degree of circular polarization (Pc ) value of 0...
March 12, 2018: Nanomaterials
Weifeng Chen, Weijing Wu, Lei Zhou, Miao Xu, Lei Wang, Honglong Ning, Junbiao Peng
A semi-analytical extraction method of interface and bulk density of states (DOS) is proposed by using the low-frequency capacitance-voltage characteristics and current-voltage characteristics of indium zinc oxide thin-film transistors (IZO TFTs). In this work, an exponential potential distribution along the depth direction of the active layer is assumed and confirmed by numerical solution of Poisson's equation followed by device simulation. The interface DOS is obtained as a superposition of constant deep states and exponential tail states...
March 11, 2018: Materials
Brian Appleton, Taylor Hubbard, Andreu Glasmann, Enrico Bellotti
We report on the modulation transfer function (MTF) in short-wave infrared indium gallium arsenide (InGaAs) on indium phosphide (InP) planar photodetector arrays. Our two-dimensional numerical method consists of optical simulations using the finite-difference time domain method and drift-diffusion simulations using the finite-element method. This parametric study investigates MTF dependence on pitch, the addition of refractive microlenses, the thickness of the InGaAs absorber, and the doping concentration of the InGaAs absorber...
March 5, 2018: Optics Express
Xiao-Mei Shi, Li-Ping Mei, Qian Wang, Wei-Wei Zhao, Jing-Juan Xu, Hong-Yuan Chen
We report herein the energy transfer (ET) between semiconducting polymer dots (Pdots) and gold nanoparticles (Au NPs) in a photoelectrochemical (PEC) system and its feasibility for cathodic bioanalysis application. Specifically, COOH-capped Pdots were first fabricated and then assembled onto the indium-tin oxide (ITO) surface, followed by the modification of single-strand (ss) DNA probe (pDNA). After the DNA hybridization with the Au NP-tethered complementary ssDNA (Au NP-tDNA), the Au NPs were brought into the close proximity of Pdots...
March 13, 2018: Analytical Chemistry
Tolga Aytug, Matthew S Rager, Wesley Higgins, Forrest G Brown, Gabriel M Veith, Christopher M Rouleau, Hui Wang, Zachary D Hood, Shannon M Mahurin, Richard T Mayes, Pooran C Joshi, Teja Kuruganti
Simple and easily integrated design of flexible and transparent electrode materials affixed to polymer based substrates hold great promise to have a revolutionary impact on the functionality and performance of energy storage devices for many future consumer electronics. Among these applications are touch sensors, roll-up displays, photovoltaic cells, health monitors, wireless sensors, and wearable communication devices. Here, we report an environmentally friendly, simple and versatile approach to produce optically transparent and mechanically flexible all-solid-state supercapacitor devices...
March 12, 2018: ACS Applied Materials & Interfaces
Bing-Zhi Chen, Man-Ling Zhi, Chuang-Xin Wang, Xue-Qiang Chu, Zhi-Liang Shen, Teck-Peng Loh
An efficient method for the preparation of alkyl indium reagents by using unactivated and cheap alkyl chlorides as substrates in the presence of indium and LiI was developed. The thus-formed alkyl indium species effectively underwent palladium-catalyzed cross-coupling reactions with aryl halides with wide functional group tolerance.
March 12, 2018: Organic Letters
Changman Kim, Cho Rong Lee, Jinhee Heo, Sung Mook Choi, Dong-Ha Lim, Jaehoon Cho, Sungwook Chung, Jung Rae Kim
Indium removal and recovery on a carbon electrode under a microbial fuel cell (MFC)-based oxidation/reduction reaction were examined using synthetic wastewater. More than 90% of In3+ ions were removed after continuous operation of the MFC for 14 days with an average current generation of ∼50 μA. During operation, indium particulates formed on the cathode carbon electrode. Scanning electron microscopy equipped with X-ray energy dispersive spectroscopy showed that they were composed of amorphous and crystalline indium hydroxides (In(OH)3 and In(OH)·H2 O)...
February 28, 2018: Bioresource Technology
Yu-Ting Gong, Fang Yuan, Yuming Dong, Zaijun Li, Guang-Li Wang
A novel and general strategy of split-type immunoassay is developed based on redox chemical reaction modulated photoelectrochemistry of carbon dots (CDs). Specifically, the photocurrent of the CDs sensitized titanium dioxide nanoparticles (TiO2 NPs) modified fluorine doped indium tin oxide (FTO) (that is the FTO/TiO2 /CDs) electrode was inhibited obviously by KMnO4 due to the oxidation of surface hydroxyl groups of CDs to electron accepting carbonyls. While the inhibited photocurrent of the KMnO4 treated FTO/TiO2 /CDs electrode can be restored by ascorbic acid (AA) because of the regeneration of electron donating hydroxyls to promote electron-hole separation...
July 19, 2018: Analytica Chimica Acta
Yohei Matsuoka, Sylvain Mathonnèire, Sven Peters, W Ted Masselink
We describe a design concept for broadband anti-reflection coatings for the mid-infrared that allows thinner film thickness and characterize its properties in the mid-infrared range from 7 μm to 12 μm. Two demonstrator coatings comprising zinc sulfide, yttrium fluoride, and germanium, all of which are deposited by electron beam evaporation on indium phosphide substrates, are optimized for the 7-12 μm and the 10-12 μm ranges. They exhibit less than 1.0% reflection over the target wavelength ranges with notably thin coating thickness...
March 1, 2018: Applied Optics
Miao Ren, Haiyang Liu, Jiao Qu, Yanan Zhang, Ying Ma, Xing Yuan
The graphene (GR)/TiO2 membrane was prepared by the sol-gel method and coated on the indium tin oxide (ITO) conductive glass, which showed high and stable photo(-electro)-catalytic activities to rhodamine B (Rh-B) in water. Characterization results showed that the GR was dispersed and wrapped in the needle-like TiO2 . With GR/TiO2 membrane and simulated sunlight irradiation, the removal efficiency of Rh-B (10 mg l-1 and pH at 5.4) arrived at 87.6% within 300 min. However, the higher removal efficiency for Rh-B reached to 97...
March 7, 2018: Environmental Science and Pollution Research International
Jiangxin Wang, Guofa Cai, Shaohui Li, Dace Gao, Jiaqing Xiong, Pooi See Lee
Stretchable conductors are vital and indispensable components in soft electronic systems. The development for stretchable conductors has been highly motivated with different approaches established to address the dilemma in the conductivity and stretchability trade-offs to some extent. Here, a new strategy to achieve superelastic conductors with high conductivity and stable electrical performance under stretching is reported. It is demonstrated that by electrically anchoring conductive fillers with eutectic gallium indium particles (EGaInPs), significant improvement in stretchability and durability can be achieved in stretchable conductors...
March 7, 2018: Advanced Materials
Chaonan Chen, Zhewei Wang, Ke Wu, Hui Ye
Series of co-sputtered silver-indium tin oxide (Ag-ITO) films are systematically fabricated. By tuning the atomic ratio of silver, composite films are manifested to have different microstructures with limited silver amount (<3 at.%). Two stages for film morphology changing are proposed to describe different status and growth mechanisms. The introduction of silver improves the preferred orientations of In2 O3 component significantly. Remarkably, dielectric permittivity of Ag-ITO films is highly adjustable, allowing the cross-over wavelengths λ c to be changed by more than 300 nm through rapid post-annealing, and thus resulting in tunable epsilon-near-zero and plasmonic properties in the near-infrared region...
2018: Science and Technology of Advanced Materials
Andrew J Clayton, Cecile M E Charbonneau, Wing C Tsoi, Peter J Siderfin, Stuart J C Irvine
Thin film tin sulphide (SnS) films were produced with grain sizes greater than 1 μm using a one-step metal organic chemical vapour deposition process. Tin-doped indium oxide (ITO) was used as the substrate, having a similar work function to molybdenum typically used as the back contact, but with potential use of its transparency for bifacial illumination. Tetraethyltin and ditertiarybutylsulphide were used as precursors with process temperatures 430-470 °C to promote film growth with large grains. The film stoichiometry was controlled by varying the precursor partial pressure ratios and characterised with energy dispersive X-ray spectroscopy to optimise the SnS composition...
2018: Science and Technology of Advanced Materials
Qian Dong, Yukihiro Hara, Kristina T Vrouwenvelder, Kai T Shin, Jared Compiano, Mohtashim Saif, Rene Lopez
Indium tin oxide (ITO) films are the premier choice of transparent conductive electrodes in optoelectronic devices, yet their application is limited in flexible substrates due to its inherent brittleness. Here we report on the fabrication of a simple ITO grating-like structure that allows it to overcome its mechanical limitations while retaining resistivity and optical qualities. The ITO nanopatterned film exhibited a resistivity < 1.3 × 10-3 Ω cm, which surpassed all previously reported values for bendable ITO and a normal transmission > 90% in the whole visible spectrum range...
March 6, 2018: ACS Applied Materials & Interfaces
M Z H Khan, Xiaoqiang Liu, J Zhu, F Ma, W Hu, Xiuhua Liu
This work reports the development of a simple and cost-effective electrochemical sensor based on electrochemically reduced graphene oxide (ErGO) bound to the surface of indium tin oxide (ITO) electrode through 3-aminopropyltriethoxysilane (APTES) monolayer (ITO/APTES/ErGO) for selective and sensitive detection of tyramine. The features of the modified electrode were studied by scanning electron microscopy (SEM), cyclic voltammetry (CV), and electrochemical impedance (EIS) methods. The analytical performance of the developed sensor was evaluated with respect to linear detection range, limit of detection, stability, coexistence interference and reproducibility...
February 23, 2018: Biosensors & Bioelectronics
Joo Yeon Kim, Nam Sung Cho, Seungmin Cho, Kisoo Kim, Sanghoon Cheon, Kyuwon Kim, Seung-Youl Kang, Seong M Cho, Jeong-Ik Lee, Ji-Young Oh, Yong-Hae Kim, Hojun Ryu, Chi-Sun Hwang, Sujung Kim, Chil Seong Ah, Tae-Youb Kim
For environmental reason, buildings increasingly install smart windows, which can dim incoming daylight based on active electrochromic devices (ECDs). In this work, multi-layered graphene (MLG) was investigated as an ECD window electrode, to minimize carbon dioxide (CO2 ) emissions by decreasing the electricity consumption for building space cooling and heating and as an alternative to the transparent conductor tin-doped indium oxide (ITO) in order to decrease dependence on it. Various MLG electrodes with different numbers of graphene layers were prepared with environmentally friendly poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) to produce ECD cells...
March 2, 2018: Scientific Reports
Thangavel Selvi, Sivan Velmathi
The indium(III) triflate-catalyzed reaction of aza-Michael adducts of chalcones with aromatic amines has been investigated. The Michael adducts derived from substituted anilines and chalcones underwent retro-Michael addition to give the original starting materials, whereas the adducts derived from 1-naphthylamines and chalcones afforded quinolines. A six-membered cyclic transition state has been proposed to explain the retro-Michael addition, while a Povarov mechanism has been put forward to explain the quinoline formation...
March 2, 2018: Journal of Organic Chemistry
Ee-Seul Kang, Da-Seul Kim, Yoojoong Han, Hyungbin Son, Yong-Ho Chung, Junhong Min, Tae-Hyung Kim
Graphene derivatives have immense potential in stem cell research. Here, we report a three-dimensional graphene/arginine-glycine-aspartic acid (RGD) peptide nanoisland composite effective in guiding the osteogenesis of human adipose-derived mesenchymal stem cells (ADSCs). Amine-modified silica nanoparticles (SiNPs) were uniformly coated onto an indium tin oxide electrode (ITO), followed by graphene oxide (GO) encapsulation and electrochemical deposition of gold nanoparticles. A RGD-MAP-C peptide, with a triple-branched repeating RGD sequence and a terminal cysteine, was self-assembled onto the gold nanoparticles, generating the final three-dimensional graphene-RGD peptide nanoisland composite...
February 27, 2018: International Journal of Molecular Sciences
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