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Core-shell nanoparticles for gas phase detection based on silver nanospheres coated with a thin molecularly imprinted polymer adsorbed on a chemiresistor

Abstract

We present a novel gas phase detection prototype based on assembling core-shell nanospheres made of silver core and coated with a molecularly imprinted polymer (MIP) adsorbed onto an interdigitated array (IDA) electrode chemiresistor (CR). The core-shell nanospheres, AgNP@MIPs, were imprinted with linalool, a volatile terpene alcohol, as a model system. The thickness of the MIP layer was tuned to a few nanometer to enable the facile ingress and egress of the linalool, as well as to enhance the electrical transduction through the Ag core. The AgNP@MIPs were spread onto the IDA-CR modified with various positively charged polymers, by drop casting and dip-coating. The AgNP@MIPs were characterized by XHR-SEM and XHR-STEM, FTIR, EDX and XRD. The MIP recognition event was transduced into a measurable increase in the resistance. The response to linalool exposure and removal was fast and the device was fully recovered and could be reused. Finally, the dif-ference in the resistance change between imprinted and non-imprinted nanospheres was substantial.

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Publication details

The article was received on 19 Feb 2018, accepted on 16 May 2018 and first published on 17 May 2018


Article type: Paper
DOI: 10.1039/C8NR01437J
Citation: Nanoscale, 2018, Accepted Manuscript
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    Core-shell nanoparticles for gas phase detection based on silver nanospheres coated with a thin molecularly imprinted polymer adsorbed on a chemiresistor

    D. Mandler, T. Shahar, G. Feldheim and S. Marx, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01437J

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