Khursheed Ahmad

Construction of TiO2 nanosheets modified glassy carbon electrode (GCE/TiO2) for the detection of hydrazine

TiO2 nanosheets were synthesized via solvothermal method and characterized using powder x-ray diffraction (PXRD), UV–vis spectroscopy, scanning electron microscopy (SEM) and energy dispersive x-ray (EDX) mapping. A binder free hydrazine sensor was fabricated by modifying the glassy carbon electrode (GCE) with TiO2 nanosheets, using simple drop casting method (GCE/TiO2). The modified GCE/TiO2 was employed for detection of hydrazine which exhibited a very high sensitivity of 70 μA mM−1 cm−2 with a limit of detection (LOD), 28 μM using cyclic voltammetry whereas a highest sensitivity 330 μA mM−1 cm−2 and LOD, 150 μM was obtained by employing square wave voltammetry.

Graphene oxide based planar heterojunction perovskite solar cell under ambient condition

Herein, we developed a highly stable planar heterojunction perovskite solar cell (PSC) with a novel architecture (ITO/GO/PEDOT:PSS/MAPbI3/PCBM/carbon tape). The PSC was developed under atmospheric conditions using GO/PEDOT:PSS as a hole transport layer and carbon tape as a back contact. The fabricated device showed good stability and performance with a power conversion efficiency of 5.2%. The fabricated devices were exposed to ambient condition for 96 h to show excellent stability. Remarkably, we found that the stability of the planar heterojunction perovskite solar cell was attributed to the presence of GO, which inhibited direct contact between PEDOT:PSS and MAPbI3.