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ACS Appl Mater Interfaces

Title:		Cellulose Nanocrystal-Based Colored Thin Films for Colorimetric Detection of Aldehyde Gases
Author(s):		Song W; Lee JK; Gong MS; Heo K; Chung WJ; Lee BY;
Address:		"Department of Mechanical Engineering , Korea University , Seoul 02841 , Korea. Department of Nanostructure Technology , National Nanofab Center , Daejeon 34141 , Korea. Department of Integrative Biotechnology , Sungkyunkwan University , Suwon 16419 , Korea. Department of Nanotechnology and Advanced Materials Engineering , Sejong University , Seoul 05006 , Korea"
Journal Title:		ACS Appl Mater Interfaces
Year:		2018
Volume:		20180319
Issue:		12
Page Number:		10353 - 10361
DOI:		10.1021/acsami.7b19738
ISSN/ISBN:		1944-8252 (Electronic) 1944-8244 (Linking)
Abstract:		"We demonstrate a controllable and reliable process for manifesting color patterns on solid substrates using cellulose nanocrystals (CNCs) without the use of any other chemical pigments. The color can be controlled by adjusting the assembly conditions of the CNC solution during a dip-and-pull process while aiding the close packing of CNCs on a solid surface with the help of ionic-liquid (1-butyl-3-methylimidazolium) molecules that screen the repelling electrostatic charges between CNCs. By controlling the pulling speed from 3 to 9 mum/min during the dip-and-pull process, we were able to control the film thickness from 100 to 300 nm, resulting in films with different colors in the visible range. The optical properties were in good agreement with the finite-difference time-domain simulation results. By functionalizing these films with amine groups, we developed colorimetric sensors that can change in color when exposed to aldehyde gases such as formaldehyde or propanal. A principal component analysis showed that we can differentiate between different aldehyde gases and other interfering molecules. We expect that our approach will enable inexpensive and rapid volatile organic compound detection with on-site monitoring capabilities"
Keywords:		1-butyl-3-methylimidazolium aldehyde sensor cellulose nanocrystals colorimetric sensor ionic liquid;
Notes:		"PubMed-not-MEDLINESong, Wonbin Lee, Jong-Kwon Gong, Mi Sic Heo, Kwang Chung, Woo-Jae Lee, Byung Yang eng 2018/03/03 ACS Appl Mater Interfaces. 2018 Mar 28; 10(12):10353-10361. doi: 10.1021/acsami.7b19738. Epub 2018 Mar 19"