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Fast and Reversible Chemiresistive Sensors for Robust Detection of Organic Vapors Using Oleylamine-Functionalized Palladium Nanoparticles

Tuo Gao

Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, USA

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Yongchen Wang

Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, USA

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Yi Luo

Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, USA

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Chengwu Zhang

Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, USA

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Zachariah Pittman

Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, USA

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Alexandra Oliveira

Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, USA

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Howard Craig

Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, USA

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Jing Zhao

Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, USA

Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA

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Brian G. Willis

Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, USA

Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA

E-mail Address: brian.willis@uconn.edu

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https://doi.org/10.1142/S012915641840027XCited by:4 (Source: Crossref)

This article is part of the issue:

Special Issue on The 27th Annual Symposium of the Connecticut Microelectronics and Optoelectronics Consortium (CMOC) held on April 4, 2018; Guest Editors: F. Jain, C. Broadbridge, M. Gherasimova and H. Tang

Abstract

Chemiresistive sensors fabricated by oleylamine-functionalized palladium nanoparticles (OLA-PdNP) have been studied in hydrogen sensing, but not so much in organic vapor sensing. Like the extensively studied gold nanoparticles-based gas sensors, palladium nanoparticles also give the ease of surface modification and large surface-area-to-volume ratio. In this study, we demonstrate an OLA-PdNP chemiresistor array with robust sensor responses (1-15% of ΔR/R₀) and accurate discrimination of six organic vapors at a concentration of p/p₀ = 0.2, using principal component analysis (PCA). Each microfabricated 36 mm² chip has 36 individual sensors. By incorporating multiple sensors on one chip, the sensor response gives a distinguishable pattern for each analyte. From this study, an electronic chemical spectrometer can be further developed by incorporating many types of ligands on palladium metal core to enhance sensor accuracy and precision.

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