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RISS 인기검색어
- 검색키워드
- 저자 : Perumal Veeramalai, Chandrasekar (검색결과 3 건)
- 무료
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Perumal Veeramalai, Chandrasekar,Li, Fushan,Guo, Tailiang,Kim, Tae Whan The Royal Society of Chemistry 2019 Dalton Transactions Vol.48 No.7
<P>This paper reports a facile, cost effective method that uses an aqueous hydrothermal process for synthesizing two-dimensional molybdenum disulphide (MoS2) monolayer quantum dots (QDs) and their potential applications in flexible memristive devices. High-resolution transmission electron microscopy and atomic force microscopy images confirmed that the diameters of the synthesized MoS2 QDs with irregular shapes were in the range between 3 and 6 nm; their thicknesses were confirmed to lie between 1.0 and 0.8 nm, a clear indication that a monolayer of MoS2 QDs had been synthesized. Photoluminescence (PL) and time-resolved PL spectra of the MoS2 QDs revealed a strong emission in the blue region with a slower decay constant. Memristive devices fabricated by incorporating MoS2 QDs between poly(methylsilsesquioxane) ultrathin layers, which had been deposited on poly(ethylene terephthalate), demonstrated a high ON-OFF current ratio of ∼10<SUP>4</SUP>, stable retention, and excellent endurance in the relaxed state; these devices were also demonstrated to function properly during bending and in a bent state. The flexible memristive devices demonstrated an OFF state with a very low current of 10<SUP>−6</SUP> A. These results clearly show that ultrathin two-dimensional QDs have promising applications in high-performance flexible memristive devices.</P>
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Veeramalai, Chandrasekar Perumal,Li, Fushan,Liu, Yang,Xu, Zhongwei,Guo, Tailiang,Kim, Tae Whan Elsevier 2016 APPLIED SURFACE SCIENCE - Vol.389 No.-
<P><B>Abstract</B></P> <P>In this work, we demonstrated the field emission properties of few layer molybdenum disulphide (MoS<SUB>2</SUB>) nanosheets synthesized by a hydrothermal method. Structural investigation indicates the as-synthesized MoS<SUB>2</SUB> layers were two dimensional few layer nanosheets with a sharp atomic edges. The field emission properties of the MoS<SUB>2</SUB> nanosheets were investigated and the results indicate that the MoS<SUB>2</SUB> nanosheets had an excellent field emission performance with turn on field of 1.0V/μm, threshold field of 2.1V/μm, and a field enhancement factor of 9880. Furthermore, the emission current shows the stability over 2h of continuous operation. The as-synthesized MoS<SUB>2</SUB> few layer nanosheets hold potential for application in next-generation field emission devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Monolayer or few layer Molepdenum disulphide nanosheets were synthesized via aqueous hydrothermal method using MoO<SUB>3</SUB> powder source. </LI> <LI> The synthesized nanosheets agglomerated while deposited on the substrates due to vanderwalls interaction between nanosheets. </LI> <LI> The superior field mission properties have been achieved for MoS<SUB>2</SUB> nanosheets attributed to the sharp edges of nanosheets. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Liu, Yang,Li, Fushan,Perumal Veeramalai, Chandrasekar,Chen, Wei,Guo, Tailiang,Wu, Chaoxing,Kim, Tae Whan American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.13
<P>Hybrid perovskite CH3NH3PbI3 has attracted extensive research interests in optoelectronic devices in recent years. Herein an inkjet printing method has been employed to deposit a perovskite CH3NH3PbI3 layer. By choosing the proper solvent and controlling the crystal growth rate, hybrid perovskite CH3NH3PbI3 nanowires, microwires, a network, and islands were synthesized by means of inkjet printing. Electrode-gap-electrode lateral-structured photodetectors were fabricated with these different crystals, of which a hybrid perovskite microwire-based photodetector would balance the uniformity and low defects to obtain a switching ratio of 16000%, responsivity of 1.2 A/W, and normalized detectivity of 2.39 x 10(12) Jones at a light power density of 0.1 mW/cm(2). Furthermore, the hybrid perovskite microwire-based photodetector arrays were fabricated and applied in an imaging sensor, from which the clear mapping of the light source signal was successfully obtained. This work paves the way for the realization of low-cost, solution-processed, and high-performance hybrid perovskite-based photodetector arrays.</P>
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