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TiO<sub>2</sub>-GQDs Nanocomposite for Room Temperature NO Gas Sensing under UV Light Irradiation
( Guntakrinda Murali ),( Chundi Seshendra Reddy ),권빈희,박성민,인인식 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Nitric oxide (NO) gas sensor has garnered extensive interest considering the NO gas adverse effects on environment and human health. Metal oxides require a high temperature to accelerate the gas interaction with the oxide surface, which is not adequate while detecting the flammable analytes. UV light illumination is observed to enhance the gas interaction with the oxide similar to thermal energy. In this study, we employed UV photoconductive graphene quantum dots(GQDs) and N-doped GQDs(NGQDs) to enhance the room temperature NO gas sensing of TiO<sub>2</sub> nanoplates. In the dark, TiO<sub>2</sub>-GQDs and TiO<sub>2</sub>-NGQDs exhibited 3 and 4 folds response increment to NO gas compared to TiO<sub>2</sub> nanoplates, respectively. Under the UV illumination, TiO<sub>2</sub>-GQDs and TiO<sub>2</sub>-NGQDs exhibited further increased NO gas response, 2 and 3 times higher response is noted compared to their response in the dark, respectively. The TiO<sub>2</sub>-NGQDs sensor shows good selectivity to NO gas. ** 2019년 한국교통대학교 지원을 받아 수행하였음.
Polarized Upconversion Emission from One-dimensional Ultrathin YF3:Yb/Er Nanostructures
( Guntakrinda Murali ),( Chundi Seshendra Reddy ),권빈희,박성민,인인식 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Upconversion (UC) nanostructures have attracted enormous research interests due to their unique optical properties underpinning their promising applications in various fields. In the present study, ultrathin YF3 nanostructures such as nanowires and nanobelts are synthesized using an oleylamine assisted colloidal chemical strategy. Two-dimensional lamellar assemblies of YF3 clusters are observed to be crucial intermediates in the growth process, which transform to nanobelts and nanowires depending on the reaction temperature. Both ultrathin nanowires and nanobelts exhibited an identical UC emission profiles comprising three emission bands centered at 545 nm (green), 660 nm (red) and 810 nm (infrared). The polarized UC emission studies on the domain of perfectly aligned assembly of parallel ultrathin YF<sub>3</sub>:Yb/Er nanowires revealed 0.32, 0.28 and 0.50 polarization degrees for green, red and infrared emission peaks, respectively. ** 2019년 한국교통대의 지원을 받아 수행하였음.