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ACS Sens

Title:		Surface-Enhanced Raman Scattering-Based Odor Compass: Locating Multiple Chemical Sources and Pathogens
Author(s):		Thrift WJ; Cabuslay A; Laird AB; Ranjbar S; Hochbaum AI; Ragan R;
Address:
Journal Title:		ACS Sens
Year:		2019
Volume:		20190828
Issue:		9
Page Number:		2311 - 2319
DOI:		10.1021/acssensors.9b00809
ISSN/ISBN:		2379-3694 (Electronic) 2379-3694 (Linking)
Abstract:		"Olfaction is important for identifying and avoiding toxic substances in living systems. Many efforts have been made to realize artificial olfaction systems that reflect the capacity of biological systems. A sophisticated example of an artificial olfaction device is the odor compass which uses chemical sensor data to identify odor source direction. Successful odor compass designs often rely on plume-based detection and mobile robots, where active, mechanical motion of the sensor platform is employed. Passive, diffusion-based odor compasses remain elusive as detection of low analyte concentrations and quantification of small concentration gradients from within the sensor platform are necessary. Further, simultaneously identifying multiple odor sources using an odor compass remains an ongoing challenge, especially for similar analytes. Here, we show that surface-enhanced Raman scattering (SERS) sensors overcome these challenges, and we present the first SERS odor compass. Using a grid array of SERS sensors, machine learning analysis enables reliable identification of multiple odor sources arising from diffusion of analytes from one or two localized sources. Specifically, convolutional neural network and support vector machine classifier models achieve over 90% accuracy for a multiple odor source problem. This system is then used to identify the location of an Escherichia coli biofilm via its complex signature of volatile organic compounds. Thus, the fabricated SERS chemical sensors have the needed limit of detection and quantification for diffusion-based odor compasses. Solving the multiple odor source problem with a passive platform opens a path toward an Internet of things approach to monitor toxic gases and indoor pathogens"
Keywords:		"Escherichia coli/chemistry/physiology Odorants/*analysis Spectrum Analysis, Raman/*methods Surface Properties Volatile Organic Compounds/analysis chemical sensing convolutional neural networks machine learning odor compass self-assembly statistical spectr;"
Notes:		"MedlineThrift, William John Cabuslay, Antony Laird, Andrew Benjamin Ranjbar, Saba Hochbaum, Allon I Ragan, Regina eng Research Support, U.S. Gov't, Non-P.H.S. 2019/08/17 ACS Sens. 2019 Sep 27; 4(9):2311-2319. doi: 10.1021/acssensors.9b00809. Epub 2019 Aug 28"