| Title: | Exploring Sn(x)Ti(1-x)O(2) Solid Solutions Grown onto Graphene Oxide (GO) as Selective Toluene Gas Sensors |
| Author(s): | Pargoletti E; Verga S; Chiarello GL; Longhi M; Cerrato G; Giordana A; Cappelletti G; |
| Address: | "Dipartimento di Chimica, Universita degli Studi di Milano, Via Golgi 19, 20133 Milan, Italy. Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali (INSTM), Via Giusti 9, 50121 Firenze, Italy. Dipartimento di Chimica & NIS, Universita degli Studi di Torino, Via P. Giuria 7, 10125 Turin, Italy" |
| ISSN/ISBN: | 2079-4991 (Print) 2079-4991 (Electronic) 2079-4991 (Linking) |
| Abstract: | "The major drawback of oxide-based sensors is the lack of selectivity. In this context, Sn(x)Ti(1-x)O(2)/graphene oxide (GO)-based materials were synthesized via a simple hydrothermal route, varying the titanium content in the tin dioxide matrix. Then, toluene and acetone gas sensing performances of the as-prepared sensors were systematically investigated. Specifically, by using 32:1 SnO(2)/GO and 32:1 TiO(2)/GO, a greater selectivity towards acetone analyte, also at room temperature, was obtained even at ppb level. However, solid solutions possessing a higher content of tin relative to titanium (as 32:1 Sn(0.55)Ti(0.45)O(2)/GO) exhibited higher selectivity towards bigger and non-polar molecules (such as toluene) at 350 degrees C, rather than acetone. A deep experimental investigation of structural (XRPD and Raman), morphological (SEM, TEM, BET surface area and pores volume) and surface (XPS analyses) properties allowed us to give a feasible explanation of the different selectivity. Moreover, by exploiting the UV light, the lowest operating temperature to obtain a significant and reliable signal was 250 degrees C, keeping the greater selectivity to the toluene analyte. Hence, the feasibility of tuning the chemical selectivity by engineering the relative amount of SnO(2) and TiO(2) is a promising feature that may guide the future development of miniaturized chemoresistors" |
| Keywords: | chemoresistor graphene oxide metal oxide solid solutions room temperature sensing selectivity sensitivity volatile organic compounds; |
| Notes: | "PubMed-not-MEDLINEPargoletti, Eleonora Verga, Simone Chiarello, Gian Luca Longhi, Mariangela Cerrato, Giuseppina Giordana, Alessia Cappelletti, Giuseppe eng Switzerland 2020/04/25 Nanomaterials (Basel). 2020 Apr 15; 10(4):761. doi: 10.3390/nano10040761" |
