| Title: | Magnetic iron oxide nanoparticles decorated graphene for chemoresistive gas sensing: The particle size effects |
| Author(s): | Tung TT; Chien NV; Van Duy N; Van Hieu N; Nine MJ; Coghlan CJ; Tran DNH; Losic D; |
| Address: | "School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia; ARC Research Hub for Graphene Enabled Industry Transformation, The University of Adelaide, Adelaide, SA 5005, Australia. International Training Institute for Materials Science, Hanoi University of Science and Technology, No. 1, Dai Co Viet, Hanoi, Viet Nam. Faculty of Electrical and Electronic Engineering, Phenikaa Institute for Advanced Study (TIAS), Phenikaa University, Yen Nghia, Ha-Dong District, Hanoi 10000, Viet Nam; Phenikaa Research and Technology Institute (PRATI), A&A Green Phoenix Group, 167 Hoang Ngan, Hanoi 10000, Viet Nam. Electronic address: hieu.nguyenvan@phenikaa-uni.edu.vn. School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia; ARC Research Hub for Graphene Enabled Industry Transformation, The University of Adelaide, Adelaide, SA 5005, Australia. Electronic address: dusan.losic@adelaide.edu.au" |
| DOI: | 10.1016/j.jcis.2018.12.077 |
| ISSN/ISBN: | 1095-7103 (Electronic) 0021-9797 (Linking) |
| Abstract: | "We report a synthesis of magnetic nanoparticles chemically immobilized onto reduced graphene oxide sheets (referred to as rGO-Fe(3)O(4) NPs) as a gas and vapor sensing platform with precisely designed particle size of 5, 10 and 20?ª+nm to explore their influence of particle size on sensing performance. The rGO-Fe(3)O(4) NP sensors have been investigated their responses to different gases and volatile organic compounds (VOCs) at part-per-million (ppm) levels. Results show that the Fe(3)O(4) NPs with smaller size (5 and 10?ª+nm) on the rGO surface led to a lower sensitivity, while particles of a size of 20?ª+nm have a significant enhancement of sensitivity compared to the bare rGO sensor. The rGO-Fe(3)O(4) NP20 sensor can detect trace amounts of NO(2) gas and ethanol vapor at the 1?ª+ppm and is highly selective to the NO(2) and ethanol among other tested gases and VOCs, respectively. The particle size causes different distribution behaviour of NPs over rGO surface and interspaced between them, which results in deceased or increased the surface interactions between gas and graphene. The NPs themselves contained different defects level and the charge depletion layer that affect their adsorption gas/vapor molecules, which are explained for different sensing responses" |
| Keywords: | Chemoresistive sensor Gas sensor Graphene Hybrid material Magnetic particles; |
| Notes: | "PubMed-not-MEDLINETung, Tran Thanh Chien, Nguyen Viet Van Duy, Nguyen Van Hieu, Nguyen Nine, Md Julker Coghlan, Campbell J Tran, Diana N H Losic, Dusan eng 2018/12/30 J Colloid Interface Sci. 2019 Mar 15; 539:315-325. doi: 10.1016/j.jcis.2018.12.077. Epub 2018 Dec 19" |
