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RISS 인기검색어
- 검색키워드
- 저자 : Venkatasubbu, G. Devanand (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Photoswitching and photocatalytic functions of Sn<sub>x</sub>Cu<sub>1−x</sub>S nanostructures
Ilanchezhiyan, P.,Kumar, G. Mohan,Siva, C.,Venkatasubbu, G. Devanand,Kang, T.W.,Kim, D.Y. Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.489 No.-
<P><B>Abstract</B></P> <P>Ultra-thin semiconducting nanostructures are garnering strategic importance in energy and environment remediation applications. In this regard, Sn<SUB>x</SUB>Cu<SUB>1−x</SUB>S nanostructures were processed through an eco-friendly chemical route and investigated in detail for photoswitching and photocatalytic functions. X-ray diffraction, FT-IR, Raman, UV–vis absorbance and high-resolution microscopic tools were initially used to examine the physico-chemical traits of Sn<SUB>x</SUB>Cu<SUB>1−x</SUB>S nanostructures. Ambiguous evidence for the substitution of Sn ions in place of Cu ions was attained through X-ray photoelectron spectroscopy. The photocatalytic performance of Sn<SUB>x</SUB>Cu<SUB>1−x</SUB>S systems was investigated through effective remediation of organic dye molecules under visible light. Scavenger based photocatalytic experiments were additionally carried out to infer the degradation mechanism. Type II <I>p-n</I> Sn<SUB>x</SUB>Cu<SUB>1−x</SUB>S/In<SUB>2</SUB>S<SUB>3</SUB> heterojunction diodes were also demonstrated for the first time with improved electrical conductivity and photoelectrical performances. The rectification ratio, forward current values and photo switching capabilities of these diodes were noted to improve in the Current vs. Voltage (I-V) and Current vs. Time (I-T) curves as a function of Sn composition and applied bias potential. The excellent photo switching stability augments the photo generated carriers to be effectively separated along the p-n junctions. The enhanced photoelectronic and photocatalytic functionalities in Sn<SUB>x</SUB>Cu<SUB>1−x</SUB>S has finally been reasoned to the improved charge transfer kinetics in the respective architectures, resulting from the effective Sn interaction in hexagonal host lattice.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sn<SUB>x</SUB>Cu<SUB>1−x</SUB>S nanostructures were fabricated by hydrothermal route. </LI> <LI> The nanostructures exhibited excellent photocatalytic activity under visible light. </LI> <LI> Sn interaction in hexagonal host lattice promoted their photocatalytic performance. </LI> <LI> p-Sn<SUB>x</SUB>Cu<SUB>1−x</SUB>S/n-In<SUB>2</SUB>S<SUB>3</SUB> diodes demonstrated improved photoswitching performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Crystallite size effect on X-ray-instigated photocurrent properties of PbWO4 thick film.
R. R. Karthieka,G. Devanand Venkatasubbu,T. Prakash 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.3
X-rays are widely used in many domains such as clinical diagnostic, imaging, industrial inspection, and environmental safety,allowing researchers for innoviative superior low-dose sensor development. In direct detection type of X-ray, X-ray photonsare directly absorbed by photoconductors such as HgI2,PbI2,and BiI3that are the available X-ray semiconductor detectors. This study analyzes the properties of micro and nanocrystalline PbWO4prepared as thick film above the interdigitated electrodefor direct photon detection. PbWO4was found to have a better attenuation value of ~ 6.13 cm2/g at 70 keV as comparedwith the existing semiconductor detectors. The X-ray-instigated photocurrent behavior of PbWO4was measured at variouslow doses by an intra-oral 70 keV machine connected with a Keithley model 2450 measuring source meter. Maximum sensitivitywas found to be about 0.40 and 9.80 nC/mGycm3, respectively, for micro and nanocrystalline PbWO4,obtained at7.97 mGy dose. The nanocrystalline PbWO4thick film displayed more than twenty-four times sensitivity as compared withthe microcrystalline PbWO4film by virtue of the nanocrystalline size effect on X-ray detection.
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Metal oxide curcumin incorporated polymer patches for wound healing
R., Thamarai Selvi,A.P.S., Prasanna,R., Niranjan,M., Kaushik,T., Devasena,J., Kumar,Chelliah, Ramachandran,Oh, Deog-Hwan,S., Swaminathan,G., Devanand Venkatasubbu Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.449 No.-
<P><B>Abstract</B></P> <P>Sodium alginate and Poly vinyl alcohol (PVA) based scaffolds are very well used for wound healing purpose. Sodium alginate is a natural polymer which is used for many biomedical applications. PVA is a biocompatible polymer used in many biomedical applications. Incorporation of Titanium dioxide (TiO<SUB>2</SUB>) nanoparticles in the scaffold increases the wound healing property of the scaffold. TiO<SUB>2</SUB> nanoparticles are biocompatible. They enhance the wound healing activity by photo catalytic property. Curcumin is used for the treatment of inflammation. It is the main active compound of turmeric Curcumin is used for treatment of wound and inflammation. It had antimicrobial and antioxidant property.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The work deals with the fabrication of patches for wound healing. </LI> <LI> Matal oxide nanoparticle is incorporated in the patch. </LI> <LI> Curcumin is incorporated in the patch. </LI> <LI> The patch surface is used for wound healing. </LI> <LI> Antibacterial and antifungal studies are done. </LI> </UL> </P>
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