title: Standardization, Calibration, and Evaluation of Tantalum-Nano rGO-SnO₂ Composite as a Possible Candidate Material in Humidity Sensors.
abstract: The present study focuses the development and the evaluation of humidity sensors based on reduced graphene oxide-tin oxide (rGO-SnO₂) nanocomposites, synthesized by a simple redox reaction between GO and SnCl₂. The physico-chemical characteristics of the nanocomposites were analyzed by XRD, TEM, FTIR, and Raman spectroscopy. The formation of SnO₂ crystal phase was observed through XRD. The SnO₂ crystal phase anchoring to the graphene sheet was confirmed through TEM images. For the preparation of the sensors, tantalum substrates were coated with the sensing material. The sensitivity of the fabricated sensor was studied by varying the relative humidity (RH) from 11% to 95% over a period of 30 days. The dependence of the impedance and of the capacitance with RH of the sensor was measured with varying frequency ranging from 1 kHz to 100 Hz. The long-term stability of the sensor was measured at 95% RH over a period of 30 days. The results proved that rGO-SnO₂ nanocomposites are an ideal conducting material for humidity sensors due to their high sensitivity, rapid response and recovery times, as well as their good long-term stability.
authors.affiliation: Department of Architectural Engineering, Hanyang University, 1271 Sa 3-dong, Sangrok-gu, Ansan 426791, Korea. karthick.chemistry@gmail.com.|PG and Research Department of Chemistry, Alagappa Government Arts College, Karaikudi 630003, Tanilnadu, India. karthick.chemistry@gmail.com.
authors.forename: Subbiah
authors.initials: S
authors.lastname: Karthick
authors.affiliation: Department of Architectural Engineering, Hanyang University, 1271 Sa 3-dong, Sangrok-gu, Ansan 426791, Korea. ercleehs@hanyang.ac.kr.
authors.forename: Han-Seung
authors.initials: HS
authors.lastname: Lee
authors.affiliation: Department of Civil Engineering, Hannam University, Daejeon 306-791, Korea. jjuni98@hannam.ac.kr.
authors.forename: Seung-Jun
authors.initials: SJ
authors.lastname: Kwon
authors.affiliation: PG and Research Department of Chemistry, Alagappa Government Arts College, Karaikudi 630003, Tanilnadu, India. nataraajan12@yahoo.co.in.
authors.forename: Rethinam
authors.initials: R
authors.lastname: Natarajan
authors.affiliation: Corrosion and Materials Protection Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630003, Tamilnadu, India. corrsaras@gmail.com.
authors.forename: Velu
authors.initials: V
authors.lastname: Saraswathy
keywords: nanocomposites; rGO-SnO2; relative humidity; sensor