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Nanotechnology 2021 Apr 21. Epub 2021 Apr 21.

Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, Shanghai, 200444, CHINA.

Nanostructured metal oxide semiconductors have received great attention used as the chemiresistive layer of gas sensor to detect the volatile organic compound recently. Among these, p-type semiconductors have many advantages, such as temperature/humidity stability and compositional versatility; however, the study of sensing mechanism is still insufficient, which hampers their practical applications. In this work, the p-type delafossite CuCrOnanoparticles were synthesized, characterized, and tested for gas sensing, followed by the first principles calculations to simulate the generation of chemiresistive signal. Read More

J Inorg Biochem 2021 Apr 18;220:111461. Epub 2021 Apr 18.

Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India. Electronic address:

Lactoperoxidase (LPO) is a mammalian heme peroxidase which catalyzes the conversion of thiocyanate (SCN¯) and iodide (I) by hydrogen peroxide (HO) into antimicrobial hypothiocyanite (OSCN¯) and hypoiodite (IO). The prosthetic heme group is covalently attached to LPO through two ester linkages involving conserved glutamate and aspartate residues. On the proximal side, His351 is coordinated to heme iron while His 109 is located in the substrate binding site on the distal heme side. Read More

J Phys Chem A 2021 Apr 21. Epub 2021 Apr 21.

Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.

In the development of new organic light-emitting diodes, thermally activated delayed fluorescence (TADF) materials have drawn interest because of their ability to upconvert electrically generated triplet excitons into singlets. Efficient TADF requires a well-balanced large transition dipole moment (μ) between the lowest excited singlet state (S) and the ground state (S) and a small energy splitting (Δ) between S and the lowest triplet state (T). However, a number of highly twisted donor-acceptor-type TADF molecules have been reported to exhibit high performance in OLEDs, although these molecules may sacrifice μ in exchange for a very small Δ. Read More

ACS Nano 2021 Apr 21. Epub 2021 Apr 21.

Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.

Monolayer transition metal dichalcogenide (TMD) alloys have emerged as a unique material system for promising applications in electronics, optoelectronics, and spintronics due to their tunable electronic structures, effective masses of carriers, and valley polarization with various alloy compositions. Although spin-orbit engineering has been extensively studied in monolayer TMD alloys, the valley Zeeman effect in these alloys still remains largely unexplored. Here we demonstrate the enhanced valley magnetic response in MoWSe alloy monolayers and MoWSe/WS heterostructures probed by magneto-photoluminescence spectroscopy. Read More

ACS Nano 2021 Apr 21. Epub 2021 Apr 21.

Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan.

Single-walled and multiwalled molybdenum disulfide (MoS) nanotubes have been coaxially synthesized on small-diameter boron nitride nanotubes (BNNTs) that are obtained from removing single-walled carbon nanotubes (SWCNTs) in heteronanotubes of SWCNTs coated by BNNTs. The photoluminescence (PL) from single-walled MoS nanotubes supported by core BNNTs is observed in this work, which evidences the direct bandgap structure of single-walled MoS nanotubes with a diameter around 6-7 nm. The observation is consistent with our DFT results that the single-walled MoS nanotube changes from an indirect-gap to a direct-gap semiconductor when the diameter of a nanotube is more than around 5. Read More