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Nanomaterials (Basel)

Title:		"VOCs Sensing by Metal Oxides, Conductive Polymers, and Carbon-Based Materials"
Author(s):		Tomic M; Setka M; Vojkuvka L; Vallejos S;
Address:		"Institute of Microelectronics of Barcelona (IMB-CNM, CSIC), Campus UAB, 08193 Cerdanyola del Valles, Barcelona, Spain. Department of Electronic Engineering, Autonomous University of Barcelona (UAB), Campus UAB, 08193 Cerdanyola del Valles, Barcelona, Spain. CEITEC-Central European Institute of Technology, Brno University of Technology, 61200 Brno, Czech Republic. Silicon Austria Labs, Microsystem Technologies, High Tech Campus Villach, Europastrabetae 12, A-9524 Villach, Austria"
Journal Title:		Nanomaterials (Basel)
Year:		2021
Volume:		20210222
Issue:		2
Page Number:		-
DOI:		10.3390/nano11020552
ISSN/ISBN:		2079-4991 (Print) 2079-4991 (Electronic) 2079-4991 (Linking)
Abstract:		"This review summarizes the recent research efforts and developments in nanomaterials for sensing volatile organic compounds (VOCs). The discussion focuses on key materials such as metal oxides (e.g., ZnO, SnO(2), TiO(2) WO(3)), conductive polymers (e.g., polypyrrole, polythiophene, poly(3,4-ethylenedioxythiophene)), and carbon-based materials (e.g., graphene, graphene oxide, carbon nanotubes), and their mutual combination due to their representativeness in VOCs sensing. Moreover, it delves into the main characteristics and tuning of these materials to achieve enhanced functionality (sensitivity, selectivity, speed of response, and stability). The usual synthesis methods and their advantages towards their integration with microsystems for practical applications are also remarked on. The literature survey shows the most successful systems include structured morphologies, particularly hierarchical structures at the nanometric scale, with intentionally introduced tunable 'decorative impurities' or well-defined interfaces forming bilayer structures. These groups of modified or functionalized structures, in which metal oxides are still the main protagonists either as host or guest elements, have proved improvements in VOCs sensing. The work also identifies the need to explore new hybrid material combinations, as well as the convenience of incorporating other transducing principles further than resistive that allow the exploitation of mixed output concepts (e.g., electric, optic, mechanic)"
Keywords:		gas sensors nanomaterials volatile organic compounds;
Notes:		"PubMed-not-MEDLINETomic, Milena Setka, Milena Vojkuvka, Lukas Vallejos, Stella eng 20-20123S/Grantova Agentura Ceske Republiky/ PID2019-107697RB-C42 (AEI/FEDER, EU), Ramon y Cajal Programme/Ministerio de Ciencia, Innovacion y Universidades/ Review Switzerland 2021/03/07 Nanomaterials (Basel). 2021 Feb 22; 11(2):552. doi: 10.3390/nano11020552"