pH Sensing Characteristics of CuS/ZnO Thin Film Implemented as EGFET

Sabah, Fayroz A. and Ahmed, Naser M. and Hassan, Z. (2017) pH Sensing Characteristics of CuS/ZnO Thin Film Implemented as EGFET. In: The International Conference of Solid State Science and Technology (ICSSST 2017).

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Abstract

Copper sulphide (CuS) is one of the most important semiconductor materials used in many applications for its semiconducting characteristics. CuS nanoscale thin films were deposited on various substrates using various methods of deposition; recently CuS thin films were used as extended gate field effect transistor (EGFET) and implemented as a pH sensor. In this work, CuS thin film was deposited on ZnO layer using spray pyrolysis deposition (SPD). CuS solution (0.4 M) was prepared from copper(II) chloride and sodium thiosulfate dissolved in deionised water. the precursors used to prepare CuS solution were copper chloride and sodium thiosulfate with 0.4 M concentration, and these precursors were solved using deionized water. The structural characteristics of this thin film show two phases for CuS; covellite and chalcocite with grain size of 31.2 nm. Nanoplate structure with a lot of aggregations was achieved from this deposition and it is confirmed by morphological examination, which estimates the roughness of the film to be 0.145 μm. CuS/ZnO thin film was used as EGFET and applied as pH sensor; the sensitivity and hysteresis were measured for this sensor to be 23.3 mV/pH and 17.5 mV, respectively.

Item Type: Conference or Workshop Item (Paper)
Subjects: Q Science > QC Physics > QC1-999 Physics
Divisions: Institut Penyelidikan dan Teknologi Nano Optoelektronik (Institute of Nano Optoelectronics Research and Technology (INOR)) > Conference or Workshop Item
Depositing User: Mr Aizat Asmawi Abdul Rahim
Date Deposited: 23 Apr 2021 02:54
Last Modified: 23 Apr 2021 02:54
URI: http://eprints.usm.my/id/eprint/49006

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