Nanomechanical Recognition and Discrimination of Volatile Molecules by Au Nanocages Deposited on Membrane-Type Surface Stress Sensors

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Abstract

Here, we show that gold nanocages (AuNCs) can be used as receptor materials for nanomechanical membrane-type surface stress sensor (MSS). The fabricated AuNCs-coated MSS (AuNCs_MSS) was employed successfully for the recognition of small volatile molecules. Each AuNCs_MSS exhibited a specific pattern of the response signal to each analyte, enabling groupwise discrimination of the compounds by means of principal component analysis (PCA). The application of contour maps of analyte-distinctive features on the PCA plots allows us to recognize polarity as a key property that affects the AuNCs_MSS response. In addition, density functional theory (DFT) calculations suggest that corners and edges of the nanocages play important roles in binding energy.

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Osica, I., Melo, A. F. A. A., Lima, F. C. D. A., Shiba, K., Imamura, G., Crespilho, F. N., … Ariga, K. (2020). Nanomechanical Recognition and Discrimination of Volatile Molecules by Au Nanocages Deposited on Membrane-Type Surface Stress Sensors. ACS Applied Nano Materials, 3(5), 4061–4068. https://doi.org/10.1021/acsanm.0c00115

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