Enhanced organophosphate sensing response of copper incorporated ZnO nanowires. (December 2019)

• Record Type: Journal Article
• Authors: Ghosh, S.P.; Pradhan, D.; Pattnaik, S.; Tripathy, N.; Das, K.C.; Bose, G.; Kar, J.P.
• Is Part Of: Materials science in semiconductor processing. Volume 104(2019)
• Publication Date: 2019-12
• Subjects: Zinc oxide -- Nanowires -- Sputtering -- Hydrothermal -- Organophosphate sensing; Semiconductors -- Periodicals; Integrated circuits -- Materials -- Periodicals; Semiconducteurs -- Périodiques; Circuits intégrés -- Matériaux -- Périodiques; Electronic journals; 621.38152
• DOI: 10.1016/j.mssp.2019.104675
• Languages: English
• ISSNs: 1369-8001

Abstract

Abstract: The use of Organophosphate (OP) based pesticides in agriculture sector causes several chronic diseases and leads to an ultimate death in living entities. The real-time detection of these pesticides is very much essential to reduce the environmental health hazards. In this research, the OP sensing behavior has been studied by using aqueous grown ZnO nanowires (NWs). In addition, an effort has been made to improve the sensing behavior by thermal incorporation of RF sputtered Cu atoms in ZnO NWs at various temperatures in argon ambient. Morphological investigations by field emission scanning electron microscopy illustrate the growth of dense ZnO NWs on ZnO/Si substrate. X-ray diffraction patterns for both Cu-incorporated NWs and as-grown ZnO NWs have depicted the evolution of c-axis oriented (002) peak, which is found to be consistent with the high resolution transmission electron microscopy and selected area diffraction results. Micro-Raman spectroscopy has shown E2 modes at about 437 cm −1 and A1 (LO)+E2H multiphonon modes peak at 980 cm −1, which corresponds to the wurtzite structure of ZnO. Photoluminescence spectra have depicted the appearance of strong peaks at 3.35 eV and 2.21 eV. OP sensing response at room temperature has shown significant improvement in the electrical conductivity with a faster response time for Cu-incorporated ZnO NWs.