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Wenzuo Wei, Ruijin Hong, Ming Jing, Wen Shao, Chunxian Tao, Dawei Zhang
Tunablity of localized surface plasmon resonance (LSPR) in doped semiconductor nanoparticles (NPs), which represents an important characteristic in LSPR sensor applications, still remains a challenge. Here, indium tin oxide/indium tin alloy (ITO/In-Sn) bilayer films were deposited by electron beam evaporation and the properties, such as LSPR and surface morphology, were investigated by UV-vis-NIR double beam spectrophotometer and atomic force microscopy (AFM), respectively. By simply engineering the thickness of ITO/In-Sn NPs without any microstructure fabrications, LSPR wavelength of ITO NPs can be largely tuned from 858 to 1758 nm...
November 15, 2017: Nanotechnology
Jianjin Dong, Irene A Goldthorpe
Transparent electrodes such as indium tin oxide and random meshes of silver nanowires (AgNWs) have isotropic in-plane properties. However, we show that imparting some alignment to AgNWs can create anisotropic transparency and electrical conductivity characteristics that may benefit many applications. For example, liquid crystal displays and the touch sensors on top of them often only need to be transparent to one type of polarized light as well as predominantly conductive in only one direction. Herein, AgNWs are slightly preferentially aligned during their deposition by rod coating...
November 14, 2017: Nanotechnology
Jun Young Choi, Keun Heo, Kyung-Sang Cho, Sung Woo Hwang, JaeGwan Chung, Sangsig Kim, Byeong Hyeon Lee, Sang Yeol Lee
The band gap properties of amorphous SiInZnO (a-SIZO) thin-film transistors (TFTs) with different Si concentrations have been studied. The electronic structures of the films, engineered by controlling the Si content, have been investigated through the changes of the band gap and band edge states. Carrier generation at oxygen vacancies can modify the band gap states of oxide thin films. Si suppresses the number of oxygen vacancies-which are carrier generation sites-so shifts the Fermi energy level away from the conduction band...
November 13, 2017: Scientific Reports
Dong Woo Kim, Joo Won Han, Kwon Taek Lim, Yong Hyun Kim
We develop the internal light outcoupling system (HRLOC) based on the high refractive index polyimide (PI) and metal oxide nanoparticles for organic light-emitting diodes (OLEDs) with silver nanowires (AgNWs). The spontaneously formed nano-bump structures, high refractive index, and light scattering properties of HRLOC significantly enhance the light extraction efficiency of OLEDs. Not only do the outcoupling structures improve the light extraction efficiency, but remarkably enhance the electrical properties of OLEDs...
November 13, 2017: ACS Applied Materials & Interfaces
Changfu Li, Ziwu Ji, Jianfei Li, Mingsheng Xu, Hongdi Xiao, Xiangang Xu
Two InGaN/GaN multiple quantum well (MQW)-based blue light emitting diodes (LEDs) emitting photons at approximately the same wavelength, with different indium contents and well widths, are prepared, and the temperature-dependences of their electroluminescence (EL) spectra at different fixed injection currents are investigated. The results show that, compared with sample B with its lower indium content and larger well width, sample A with its higher indium content and smaller well width, has a stronger carrier localization effect and higher external quantum efficiency (EQE) at the lower fixed currents; however, upon increasing the injection current, both the localization effect and EQE for sample A decrease at a faster rate...
November 10, 2017: Scientific Reports
Shoji Okuda, Hironori Nishibori, Hiroaki Hoshi
Indium chloride ((111)In-Cl3) scintigraphy has been used to evaluate various hematological diseases for many years. However, there have been few reports on patients with bone marrow reconversion showing high uptake in (111)In-Cl3 scintigraphy. Herein, we report a case of a 68-year-old man with esophageal cancer who underwent (18)F-FDG PET/CT for staging of the disease. (18)F-FDG PET/CT demonstrated high uptake in the first lumbar vertebral body, which was difficult to distinguish bone metastasis and bone marrow reconversion...
November 10, 2017: Journal of Nuclear Medicine Technology
Xianwen Liang, Tao Zhao, Pengli Zhu, Yougen Hu, Rong Sun, Ching-Ping Wong
High contact resistance between silver nanowires (AgNWs) is a key issue in widespread application of AgNW flexible transparent conductive films as a promising candidate to replace the brittle and expensive indium tin oxide. A facile, room-temperature nanowelding method of an AgNW network triggered by hydrogen chloride (HCl) vapor is demonstrated to reduce the sheet resistance of the AgNW network. Under the visible light, O2 and HCl vapor serving as an etching couple induced silver atoms to be transferred from the bottom AgNW at the junction to the top one, and then, these silver atoms epitaxially recrystallized at the contact position with the lattice of the top AgNW as the template, ultimately resulting in the coalescence of the junction between AgNWs...
November 10, 2017: ACS Applied Materials & Interfaces
Thomas J Whittles, Tim D Veal, Christopher N Savory, Adam W Welch, Francisco Willian de Souza Lucas, James T Gibbon, Max Birkett, Richard J Potter, David O Scanlon, Andriy Zakutayev, Vinod R Dhanak
The earth-abundant material CuSbS2 (CAS) has shown good optical properties as a photovoltaic solar absorber material, but has seen relatively poor solar cell performance. To investigate the reason for this anomaly, the core-levels of the constituent elements, surface contaminants, ionization potential, and valence band spectra are studied by x-ray photoemission spectroscopy (XPS). The ionization potential and electron affinity for this material (4.98 eV and 3.43 eV) are lower than for other common absorbers, including CuInxGa(1-x)Se2 (CIGS)...
November 10, 2017: ACS Applied Materials & Interfaces
Youngjun Song, Sejung Kim, Michael J Heller
Recently, instead of indium tin oxide (ITO), the random mesh pattern of metallic nanowires for flexible transparent conducting electrodes (FTCEs) has received a great amount of interest due to its flexibility, low resistance, reasonable price and compliant processes. Mostly, nanowires for FTCEs are fabricated by spray or mayer coating methods. However, the metallic nanowires layer of FTCEs, which is fabricated by these methods, has spiked surface roughness and low junction contact between the nanowires that leads to their high sheet resistance value...
November 10, 2017: ACS Applied Materials & Interfaces
Maksym V Kovalenko, Loredana Protesescu, Maryna I Bodnarchuk
Semiconducting lead halide perovskites (LHPs) have not only become prominent thin-film absorber materials in photovoltaics but have also proven to be disruptive in the field of colloidal semiconductor nanocrystals (NCs). The most important feature of LHP NCs is their so-called defect-tolerance-the apparently benign nature of structural defects, highly abundant in these compounds, with respect to optical and electronic properties. Here, we review the important differences that exist in the chemistry and physics of LHP NCs as compared with more conventional, tetrahedrally bonded, elemental, and binary semiconductor NCs (such as silicon, germanium, cadmium selenide, gallium arsenide, and indium phosphide)...
November 10, 2017: Science
Katherine L Orchard, Daisuke Hojo, Katarzyna P Sokol, Meng-Ju Chan, Naoki Asao, Tadafumi Adschiri, Erwin Reisner
Visible-light driven H2 evolution in water is achieved using catechol-photosensitised TiO2 nanoparticles with a molecular nickel catalyst. Layer-by-layer immobilisation of catechol-TiO2 onto tin-doped indium oxide electrodes generates photocathodic currents in the presence of an electron acceptor. This approach represents a new strategy for controlling photocurrent direction in dye-sensitised photoelectrochemical applications.
November 9, 2017: Chemical Communications: Chem Comm
Oliver T Bruns, Thomas S Bischof, Daniel K Harris, Daniel Franke, Yanxiang Shi, Lars Riedemann, Alexander Bartelt, Frank B Jaworski, Jessica A Carr, Christopher J Rowlands, Mark W B Wilson, Ou Chen, He Wei, Gyu Weon Hwang, Daniel M Montana, Igor Coropceanu, Odin B Achorn, Jonas Kloepper, Joerg Heeren, Peter T C So, Dai Fukumura, Klavs F Jensen, Rakesh K Jain, Moungi G Bawendi
For in vivo imaging, the short-wavelength infrared region (SWIR; 1000-2000 nm) provides several advantages over the visible and near-infrared regions: general lack of autofluorescence, low light absorption by blood and tissue, and reduced scattering. However, the lack of versatile and functional SWIR emitters has prevented the general adoption of SWIR imaging by the biomedical research community. Here, we introduce a class of high-quality SWIR-emissive indium-arsenide-based quantum dots (QDs) that are readily modifiable for various functional imaging applications, and that exhibit narrow and size-tunable emission and a dramatically higher emission quantum yield than previously described SWIR probes...
2017: Nature biomedical engineering
Javad Garousi, Sarah Lindbo, Bogdan Mitran, Jos Buijs, Anzhelika Vorobyeva, Anna Orlova, Vladimir Tolmachev, Sophia Hober
ABD-Derived Affinity Proteins (ADAPTs) is a novel class of engineered scaffold proteins derived from an albumin-binding domain of protein G. The use of ADAPT6 derivatives as targeting moiety have provided excellent preclinical radionuclide imaging of human epidermal growth factor 2 (HER2) tumor xenografts. Previous studies have demonstrated that selection of nuclide and chelator for its conjugation has an appreciable effect on imaging properties of scaffold proteins. In this study we performed a comparative evaluation of the anti-HER2 ADAPT having an aspartate-glutamate-alanine-valine-aspartate-alanine-asparagine-serine (DEAVDANS) N-terminal sequence and labeled at C-terminus with (99m)Tc using a cysteine-containing peptide based chelator, glycine-serine-serine-cysteine (GSSC), and a similar variant labeled with (111)In using a maleimido derivative of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) chelator...
November 7, 2017: Scientific Reports
Jung-Hyun Kang, Anna Grivnin, Ella Bor, Jonathan Reiner, Nurit Avraham, Yuval Ronen, Yonatan Cohen, Perla Kacman, Hadas Shtrikman, Haim Beidenkopf
It was recently shown that in situ epitaxial aluminum coating of indium arsenide nanowires is possible and yields superior properties relative to ex-situ evaporation of aluminum ( Nat. Mater. 2015 , 14 , 400 - 406 ). We demonstrate a robust and adaptive epitaxial growth protocol satisfying the need for producing an intimate contact between the aluminum superconductor and the indium arsenide nanowire. We show that the (001) indium arsenide substrate allows successful aluminum side-coating of reclined indium arsenide nanowires that emerge from (111)B microfacets...
November 14, 2017: Nano Letters
Yinyin Qian, Qing Yang
Indium antimonide (InSb) enables diverse applications in electronics and optoelectronics. However, to date, there has not been a report on the synthesis of InSb nanowires (NWs) via a solution-phase strategy. Here, we demonstrate for the first time the preparation of high-quality InSb NWs with twinning superlattices from a mild solution-phase synthetic environment from the reaction of commercial triphenylantimony with tris(2,4-pentanedionato)-indium(III). This reaction occurs at low temperatures from 165 to 195 °C (optimized at ∼180 °C), which is the lowest temperature reported for the growth of InSb NWs to date...
November 14, 2017: Nano Letters
Imen Ben Amara, Aida Hichri, Sihem Jaziri
Electronic and optical performances of β-InSe monolayer (ML) are considerably boosted by tuning the corresponding band energies through the lattice in-plane compressive strain engineering. First principle calculations show an indirect-direct gap transition with large band gap size. The crossover is due to different responses of the near-gap state energies with respect to strain. This is explained by the variation of In-Se bond length, the bond nature of near-band-edge electronic orbital and of the momentum angular contribution versus in-plane compressive strain...
November 8, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Semi Oh, Kab Ha, Soo Hyun Kang, Gyu-Jae Yohn, Hyo-Ju Lee, Seong-Ju Park, Kyoung-Kook Kim
Self-standing ZnO nanotube (ZNT) arrays were fabricated on the surface of GaN-based emitter with an indium tin oxide (ITO) transparent layer using a hydrothermal method and temperature cooling down process. For the greater enhancement of photon extraction efficiency (PEE), ZNT/SiO2 core-shell nanostructure arrays were fabricated on the emitter with a 430 nm wavelength. The optical output power of ZNT/SiO2 core-shell arrays on the emitter with ITO electrode was remarkably enhanced by 18.5%, 28.1%, and 55.9%, compared to those of ZNTs, ZNRs on an ITO film on an emitter and ITO film on an emitter as a conventional emitter, respectively...
November 8, 2017: Nanotechnology
Er-Xiong Ding, Hua Jiang, Qiang Zhang, Ying Tian, Patrik Laiho, Aqeel Hussain, Yongping Liao, Nan Wei, Esko I Kauppinen
Single-walled carbon nanotube (SWCNT) films have great potential to replace indium tin oxide films for applications in transparent and conductive electronics. Here we report a high yield production of SWCNT transparent conducting films (TCFs) by the floating catalyst chemical vapor deposition method using ethanol as the carbon source. To the best of our knowledge, this is the first report regarding SWCNT TCFs using ethanol as the carbon source. The fabricated uniform SWCNT TCFs exhibit a competitive sheet resistance of 95 Ω sq(-1) at 90% transmittance after doping with AuCl3...
November 16, 2017: Nanoscale
Danil W Boukhvalov, Bekir Gürbulak, Songül Duman, Lin Wang, Antonio Politano, Lorenzo S Caputi, Gennaro Chiarello, Anna Cupolillo
Among the various two-dimensional semiconductors, indium selenide has recently triggered the interest of scientific community, due to its band gap matching the visible region of the electromagnetic spectrum, with subsequent potential applications in optoelectronics and especially in photodetection. In this feature article, we discuss the main issues in the synthesis, the ambient stability and the application capabilities of this novel class of two-dimensional semiconductors, by evidencing open challenges and pitfalls...
November 5, 2017: Nanomaterials
Masaki Ito, Masumi Itazaki, Hiroshi Nakazawa
Organonitriles (RC≡N) were selectively converted into the corresponding diborylamines (RCH2N(Bpin)2) in reactions with pinacolborane (pinBH) in the presence of a catalytic amount of the iron-indium complex [Fe(CH3CN)6][cis-Fe(CO)4(InCl3)2]. The catalytic reaction mechanism was tentatively proposed. In addition, this catalytic system was found to be applicable for the synthesis of borylsilylamine in high yield when organonitrile was treated with hydroborane and hydrosilane simultaneously.
November 7, 2017: Inorganic Chemistry
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