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Bekir Çakıroğlu, Mahmut Özacar
In this study, a photoelectrochemical (PEC) biosensor was constructed by depositing supercapacitor carbon nanotubes (CNT) and Co3 O4 onto the anatase TiO2 coated ITO electrodes. Herein, supercapacitor Co3 O4 was employed as a semiconductor with a band gap of ~2.07 eV, and the supercapacitor behavior of the PEC system was improved by introducing CNT into the electrode material. Furthermore, a self-empowering glucose biosensor operating at 0 V was constructed for the first time. Also, upon the formation of p-n junction, Co3 O4 was rendered electron accepting material, unlike its usual use in photocatalytic systems...
July 27, 2018: Biosensors & Bioelectronics
Junkun Chen, Liqin Hu, Jingzhen Yang, Ping Liu
OBJECTIVE: To detect numerical chromosomal aberrations and copy number variations (CNVs) in abortus tissue samples with a benchtop semiconductor sequencing platform (SSP). METHODS: One hundred and forty patients with early spontaneous abortions at between 7 and 16 weeks were selected. Following DNA extraction, library preparation, high-throughput sequencing was carried out. RESULTS: Chromosomal anomalies were detected in 82 cases (58.57%), which included 67 aneuploidies and 15 CNVs...
August 10, 2018: Zhonghua Yi Xue Yi Chuan Xue za Zhi, Zhonghua Yixue Yichuanxue Zazhi, Chinese Journal of Medical Genetics
Wei-De Zhang, Miao Sun, Kui Li, Yu-Xian Yu
In this study, we report a photocatalyst with distorted skeleton, which was synthesized by grafting triamterene onto graphitic carbon nitride (g-C3N4) frameworks. Pteridine ring of triamterene-based nitrogen-enriched organic structure, functions as trapped electron sites due to its inductive effect. Benzene ring in triamterene plays an important role on even dispersion of electrons by conjugative effect. Intramolecular electronic potential redistribution caused by synergistic effect between pteridine ring and benzene ring of triamterene promotes separation and migration of photo-induced charge carriers...
August 11, 2018: Chemistry, An Asian Journal
Zaina Algarni, Abhay Singh, Usha Philipose
Although various synthesis and characterization strategies have been employed for the synthesis of crystalline nanowires, there is very little work done on development of low-dimensional amorphous semiconductors. This paper presents a simple strategy to grow amorphous InSb ( a -InSb) nanowires (NWs) in a chemical vapor deposition (CVD) system. The NWs were grown on Si substrate coated with indium film and the lack of crystallinity in the as-grown stoichiometric NWs was ascertained by Raman spectroscopy and electron transport measurements...
August 9, 2018: Nanomaterials
Alexey A Vasiliev, Andrey E Varfolomeev, Ivan A Volkov, Nikolay P Simonenko, Pavel V Arsenov, Ivan S Vlasov, Victor V Ivanov, Alexander V Pislyakov, Alexander S Lagutin, Igor E Jahatspanian, Thomas Maeder
The application of gas sensors in breath analysis is an important trend in the early diagnostics of different diseases including lung cancer, ulcers, and enteric infection. However, traditional methods of synthesis of metal oxide gas-sensing materials for semiconductor sensors based on wet sol-gel processes give relatively high sensitivity of the gas sensor to changing humidity. The sol-gel process leading to the formation of superficial hydroxyl groups on oxide particles is responsible for the strong response of the sensing material to this factor...
August 8, 2018: Sensors
Archana Raja, Malte Selig, Gunnar Berghäuser, Jaeeun Yu, Heather M Hill, Albert F Rigosi, Louis E Brus, Andreas Knorr, Tony F Heinz, Ermin Malic, Alexey Chernikov
Layered transition metal dichalcogenides exhibit the emergence of a direct bandgap at the monolayer limit, along with pronounced excitonic effects. In these materials, interaction with phonons is the dominant mechanism that limits the exciton coherence lifetime and determines exciton diffusion under most experimental conditions. However, the fundamental changes in the exciton-phonon interaction are not well understood as the material undergoes the transition from a direct to an indirect gap semiconductor. Here, we address this question through optical spectroscopy and microscopic theory...
August 10, 2018: Nano Letters
M Hays, G de Lange, K Serniak, D J van Woerkom, D Bouman, P Krogstrup, J Nygård, A Geresdi, M H Devoret
The modern understanding of the Josephson effect in mesosopic devices derives from the physics of Andreev bound states, fermionic modes that are localized in a superconducting weak link. Recently, Josephson junctions constructed using semiconducting nanowires have led to the realization of superconducting qubits with gate-tunable Josephson energies. We have used a microwave circuit QED architecture to detect Andreev bound states in such a gate-tunable junction based on an aluminum-proximitized indium arsenide nanowire...
July 27, 2018: Physical Review Letters
Hui Chen, Yanfang Zhao, Lei Shi, Guo-Dong Li, Lei Sun, Xiaoxin Zou
The cation substitutional doping of metal-oxide semiconductors plays pivotal roles in improving the gas sensing performances, but the doping effect on surface sensing reaction is still not well understood. In this study, indium oxides doped with various heteroatoms are investigated to obtain in-depth understanding of how doping (or the resulting change in electronic structure) alters the surface absorbed oxygen chemistry and subsequent sensing process. The experimental results reveal that energy level of In2O3 can be modulated by introduction of these dopants, some of which (e...
August 10, 2018: ACS Applied Materials & Interfaces
Ying Gao, Nan Gao, Hongdong Li, Xiaoxi Yuan, Qiliang Wang, Shaoheng Cheng, Junsong Liu
In this work, we report a favorable diamond substrate to realize semiconductor surface-enhanced Raman spectroscopy (SERS) for trace molecular probes with high sensitivity, stability, reproducibility, recyclability and universality. The boron-doped diamond (BDD) with surface hydrogenation or oxygenation has matched energy levels corresponding to the target molecules and plays a critical role in achieving SERS. The enhancement factor based on BDD substrates can reach 104-105, which approaches those obtained with most nanostructured compound semiconductors and is nearly 3-4 orders of magnitude higher than those of state-of-the-art single-element semiconductors (silicon, germanium, and graphene)...
August 10, 2018: Nanoscale
Joohoon Kang, Spencer A Wells, Vinod K Sangwan, David Lam, Xiaolong Liu, Jan Luxa, Zdeněk Sofer, Mark C Hersam
Layered indium selenide (InSe) presents unique properties for high-performance electronic and optoelectronic device applications. However, efforts to process InSe using traditional liquid phase exfoliation methods based on surfactant-assisted aqueous dispersions or organic solvents with high boiling points compromise electronic properties due to residual surface contamination and chemical degradation. Here, these limitations are overcome by utilizing a surfactant-free, low boiling point, deoxygenated cosolvent system...
August 10, 2018: Advanced Materials
Yipeng An, Jutao Jiao, Yusheng Hou, Hui Wang, Dapeng Wu, Tianxing Wang, Zhaoming Fu, Guoliang Xu, Ruqian Wu
We study the electronic transport properties of two-dimensional (2D) fully-hydrogenated borophene (namely, borophane), using density functional theory and non-equilibrium Green's function approaches. Borophane shows a perfect electrical transport anisotropy and is promising for applications. Along the peak- or equivalently the valley-parallel direction, 2D borophane exhibits a metallic characteristic and its current-voltage (I-V) curve shows a linear behavior, corresponding to the ON state in borophane-based nano-switches...
August 10, 2018: Physical Chemistry Chemical Physics: PCCP
Hirokazu Tahara, Masanori Sakamoto, Toshiharu Teranishi, Yoshihiko Kanemitsu
Multiple excitons in semiconductor nanocrystals have been extensively studied with respect to unique carrier dynamics including quantized Auger recombination and implementation in optoelectronic devices such as solar cells and photodetectors. However, the generation mechanism of multiple excitons still remains unclear. Here, we study instantaneous and delayed multiple exciton generation processes in PbS/CdS core/shell nanocrystals. The absorption cross-sections of biexcitons and triexcitons are identical to that of single excitons under instantaneous excitation with a single pulse...
August 9, 2018: Nature Communications
E Estrecho, T Gao, N Bobrovska, M D Fraser, M Steger, L Pfeiffer, K West, T C H Liew, M Matuszewski, D W Snoke, A G Truscott, E A Ostrovskaya
A bosonic condensate of exciton polaritons in a semiconductor microcavity is a macroscopic quantum state subject to pumping and decay. The fundamental nature of this driven-dissipative condensate is still under debate. Here, we gain an insight into spontaneous condensation by imaging long-lifetime exciton polaritons in a high-quality inorganic microcavity in a single-shot optical excitation regime, without averaging over multiple condensate realisations. We demonstrate that condensation is strongly influenced by an incoherent reservoir and that the reservoir depletion, the so-called spatial hole burning, is critical for the transition to the ground state...
August 9, 2018: Nature Communications
Darren Homeniuk, Marek Malac, Misa Hayashida
Interface roughness is a critical parameter determining the performance of semiconductor devices. We show that a continuous wavelet transform is useful to describe not only the magnitude of the interface roughness, but also the spatial frequencies that describe the interface. We propose a simple presentation of the results that makes it convenient to compare between interfaces. In particular, an average and maximum value wavelet profile that is obtained from a series of one dimensional wavelet transforms provides a traceable and quick survey of the results...
July 26, 2018: Ultramicroscopy
Songhua Cai, Chenyi Gu, Yifan Wei, Min Gu, Xiaoqing Pan, Peng Wang
In situ transmission electron microscopy (TEM) technology has become one of the fastest growing areas in TEM research in recent years. This technique allows researchers to investigate the dynamic response of materials to external stimuli inside the microscope. Optoelectronic functional semiconducting materials play an irreplaceable role in several key fields such as clean energy, communications, and pollution disposal. The ability to observe the dynamic behavior of these materials under real working conditions using advanced TEM technologies would provide an in-depth understanding of their working mechanisms, enabling further improvement of their properties...
July 24, 2018: Ultramicroscopy
Zachary Piontkowski, David W McCamant
Donor-π-acceptor complexes for solar energy conversion are commonly composed of a chomophore donor and a semiconductor nanoparticle acceptor separated by a π bridge. The electronic coupling between donor and acceptor is known to be large when the π systems of the donor and bridge are coplanar. However, the accessibility of highly coplanar geometries in the excited state is not well understood. In this work, we clarify the relationship between bridge structure and excited state donor-bridge coplanarization by comparing rhodamine sensitizers with either phenylene (O-Ph) or thiophene (O-Th) bridge units...
August 9, 2018: Journal of the American Chemical Society
Fan Zhang, Junjie He, Yuren Xiang, Kai Zheng, Bin Xue, Shuai Ye, Xiao Peng, Yuying Hao, Jiarong Lian, Pengju Zeng, Junle Qu, Jun Song
Antimonene-based 2D materials are attracting increasing research interest due to their superior physicochemical properties and promising applications in next-generation electronics and optoelectronics devices. However, the semiconductor properties of antimonene are still at the theoretical simulation stage and are not experimentally verified, significantly restricting its applications in specific areas. In this study, the semiconductor properties of monolayer antimonene nanosheets are experimentally verified...
August 9, 2018: Advanced Materials
Hong Wang, Yanjuan Sun, Wenjie He, Ying Zhou, Shun Cheng Lee, Fan Dong
Photogenerated electrons play a vital role in photocatalysis as they can induce the formation of radicals participating in the reaction or recombine with holes preventing them from the subsequent redox reaction. In this work, we explore an Earth-abundant insulator coupled with a semiconductor and construct insulator-semiconductor heterojunctions to effectively realize the efficient electron transfer from the semiconductor to the insulator and thus the enhanced charge carrier separation on the semiconductor...
August 9, 2018: Nanoscale
Ashutosh Agarwal, Ying Qin, Bin Chen, Mark Blei, Kedi Wu, Lei Liu, Yuxia Shen, David Wright, Matthew D Green, Houlong Zhuang, Sefaattin Tongay
Alloying in semiconductors has enabled many civilian technologies in electronics, optoelectronics, photonics, and others. While the alloying phenomenon is well established in traditional bulk semiconductors owing to a vast array of available ternary phase diagrams, alloying in 2D materials still remains at its seminal stages. This is especially true for transition metal trichalcogenides (TMTCs) such as TiS3 which has been recently predicted to be a direct gap, high carrier mobility, pseudo-1D semiconductor...
August 9, 2018: Nanoscale
Qijing Bu, Shuo Li, Qiannan Wu, Lingling Bi, Dejun Wang, Xiaoxin Zou, Tengfeng Xie
Semiconductor electrodes integrated with cocatalysts are key components of photoelectrochemistry (PEC) based solar-energy conversion. However, efforts to optimize the PEC device have been limited by an inadequate understanding of the interface interactions between semiconductor-cocatalyst (sem|cat) and cocatalyst-electrolyte (cat|ele) interface. In our work, we used ferrihydrite (Fh) modified Ti-Fe2O3 as a model to explore the transfer process of photogenerated charge carriers between Ti-Fe2O3-Fh (Ti-Fe2O3|Fh) interface and Fh-electrolyte (Fh|ele) interface...
August 8, 2018: ChemSusChem
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