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N.S.K. Gowthaman,Debananda Mohapatra,P. Arul,Wei Sea Chang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
This paper describes the decoration of AuNPs on carbon nano-onions (CNO) followed by its fabrication onelectrode surface for the sensitive determination of environmental pollutant hydrazine (HZ). A greenultrasonication approach was employed to decorate the AuNPs on CNOs and it follows electroless deposition. HR-TEM results reveal that spherical 10 nm-sized AuNPs were well dispersed on 30 nm-sizedCNOs. The obtained 3.7 eV spin–orbit coupling in the XPS Au4f region suggests the successful decorationof Au(0) on CNO. The Au@CNO nanostructure was then directly attached on GC electrode surface by simpleimmersion and achieved through p–p stacking interaction and the resultant electrode exhibited highelectroactive surface area and lower resistivity when compared to the CNO fabricated electrode. TheAu@CNO electrode was utilized to determine HZ in effluent samples and delivered higher electrocatalyticactivity by showing lower onset potential than the bare and CNO fabricated electrodes. The increasedelectroactive area and high electronic conductivity of Au@CNO nanostructure are attributed to theoffered lowest detection limit of 12 109 M (S/N = 3) and larger sensitivity of 485.7 lA/mM cm2. The green and environmentally benign approached Au@CNO nanostructure leads to their successfulimplementation in the determination of HZ in effluent samples.
Kai Jeat Hong,Sin Tee Tan,Kok-Keong Chong,리 호 뱅,Riski Titian Ginting,Fang Sheng Lim,Chi Chin Yap,Chun Hui Tan,Wei Sea Chang,Mohammad Hafizuddin Hj Jumali 한국물리학회 2018 Current Applied Physics Vol.18 No.12
Charge transport dynamics in ZnO based inverted organic solar cell (IOSC) has been characterized with transient photocurrent spectroscopy and localised photocurrent mapping-atomic force microscopy. The value of maximum exciton generation rate was found to vary from 2.6×1027m−3s−1 (Jsat=79.7 Am−2) to 2.9×1027m−3s−1 (Jsat=90.8 Am−2) for devices with power conversion efficiency ranging from 2.03 to 2.51%. These results suggest that nanorods served as an excellent electron transporting layer that provides efficient charge transport and enhances IOSC device performance. The photovoltaic performance of OSCs with various growth times of ZnO nanorods have been analysed for a comparison between AM1.5G spectrum and local solar spectrum. The simulated PCE of all devices operating under local spectrum exhibited extensive improvement with the gain of 13.3–13.7% in which the ZnO nanorods grown at 15 min possess the highest PCE under local solar with the value of 2.82%.