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Langmuir

Title:		Improved Ethanol Sensing Performance of alpha-MnO(2) Nanorods at Room Temperature Enabled through PPy Embedding
Author(s):		Adhikari M; Saha D; Chattopadhyay D; Pal M;
Address:		"Department of Polymer Science and Technology, University of Calcutta, Kolkata 700073, India. CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032, India"
Journal Title:		Langmuir
Year:		2023
Volume:		20230821
Issue:		34
Page Number:		12248 - 12259
DOI:		10.1021/acs.langmuir.3c01626
ISSN/ISBN:		1520-5827 (Electronic) 0743-7463 (Linking)
Abstract:		"Ethanol is a colorless, highly flammable, volatile organic compound and is a biomarker for fatty liver diseases. So, high-performance and reliable ethanol sensors are the need of the day for biomedical and environmental monitoring applications and drunken driving detection. In this work, we have reported a polypyrrole (PPy)-embedded alpha-MnO(2) nanorod (NR)-based chemiresistive sensor for the selective detection of trace ethanol vapor at room temperature (25 degrees C). PPy-embedded alpha-MnO(2) NR nanocomposites (MP25, MP50, and MP100) were synthesized by in situ chemical oxidative polymerization of pyrrole followed by mixing of alpha-MnO(2) NR having different weight ratios. The prepared nanocomposites were characterized by various sophisticated instruments such as XRD, FTIR, Raman spectroscopy, BET, FESEM, TEM, EDX, UV-vis spectroscopy, and current-voltage (I-V) measurement. The as-prepared sensor, namely, PPy-embedded alpha-MnO(2) nanorod (MP50), shows the highest response to ethanol vapor with a detection lower limit of 1 ppm at room temperature with rapid response ( approximately 2.39 s) and recovery ( approximately 37.08 s) times associated with at least 60 days stability, excellent selectivity, good repeatability, and reproducibility. The formation of a p-n heterojunction and transfer of charge carriers between PPy and MnO(2) nanoparticles are attributed to the enhancement of sensing performance. Thus, the prepared sensor could be potentially applicable to detect ethanol content in alcoholic beverages, diagnose liver disease from exhale breath analysis, and drunken driving detection"
Keywords:
Notes:		"PubMed-not-MEDLINEAdhikari, Monalisa Saha, Debdulal Chattopadhyay, Dipankar Pal, Mrinal eng 2023/08/21 Langmuir. 2023 Aug 29; 39(34):12248-12259. doi: 10.1021/acs.langmuir.3c01626. Epub 2023 Aug 21"