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Sensors (Basel)

Title:		Growth Mechanisms of ZnO Micro-Nanomorphologies and Their Role in Enhancing Gas Sensing Properties
Author(s):		Fioravanti A; Marani P; Morandi S; Lettieri S; Mazzocchi M; Sacerdoti M; Carotta MC;
Address:		"Istituto di Scienze e Tecnologie per l'Energia e la Mobilita Sostenibili (CNR-STEMS), Via Canal Bianco 28, 44124 Ferrara, Italy. Dipartimento di Chimica, Universita di Torino, Via P. Giuria 7, 10125 Torino, Italy. Istituto di Scienze Applicate e Sistemi Intelligenti 'E. Caianiello' (CNR-ISASI), Complesso Universitario di Monte S. Angelo, Via Cupa Cintia 21, 80126 Napoli, Italy. Istituto di Geoscienze e Georisorse (CNR-IGG), Via G. La Pira 4, 50121 Firenze, Italy. Dipartimento di Fisica e Scienze della Terra, Universita di Ferrara, Via Saragat 1, 44122 Ferrara, Italy"
Journal Title:		Sensors (Basel)
Year:		2021
Volume:		20210213
Issue:		4
Page Number:		-
DOI:		10.3390/s21041331
ISSN/ISBN:		1424-8220 (Electronic) 1424-8220 (Linking)
Abstract:		"Zinc oxide (ZnO) is one of the main functional materials used to realize chemiresistive gas sensors. In addition, ZnO can be grown through many different methods obtaining the widest family of unique morphologies. However, the relationship between the ZnO morphologies and their gas sensing properties needs more detailed investigations, also with the aim to improve the sensor performances. In this work, seven nanoforms (such as leaves, bisphenoids, flowers, needles, etc.) were prepared through simple wet chemical synthesis. Morphological and structural characterizations were performed to figure out their growth mechanisms. Then, the obtained powders were deposited through screen-printing technique to realize thick film gas sensors. The gas sensing behavior was tested toward some traditional target gases and some volatile organic compounds (acetone, acetaldehyde, etc.) and compared with ZnO morphologies. Results showed a direct correlation between the sensors responses and the powders features (morphology and size), which depend on the specific synthesis process. The sensors can be divided in two behavioral classes, following the two main morphology kinds: aggregates of nanocrystals (leaves and bisphenoids), exhibiting best performances versus all tested gases and monocrystal based (stars, needle, long needles, flowers, and prisms)"
Keywords:		VOCs detection ZnO nanomorphologies chemoresistive gas sensors growth mechanisms pseudomorphism thick films epsilon-Zn(OH)2;
Notes:		"PubMed-not-MEDLINEFioravanti, Ambra Marani, Pietro Morandi, Sara Lettieri, Stefano Mazzocchi, Mauro Sacerdoti, Michele Carotta, Maria Cristina eng Switzerland 2021/03/07 Sensors (Basel). 2021 Feb 13; 21(4):1331. doi: 10.3390/s21041331"