Chelating Phosphine Ligand Stabilized AuNPs in Methane Detection
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nn-2020-04154n.R3_Proof_hi copy.pdf
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Accepted version
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680.75 KB
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Author(s)
Tang, Cen
Ku, Kang Hee
Luo, Shao-Xiong Lennon
Concellon Allueva, Alberto
Wu, You-Chi Mason
Lu, Ruqiang
Swager, Timothy M
Date Issued
August 2020
Journal
ACS Nano
Publisher
American Chemical Society (ACS)
Citation
Tan, Cen et al. "Chelating Phosphine Ligand Stabilized AuNPs in Methane Detection." ACS Nano 14, 9 (August 2020): 11605–11612 © 2020 American Chemical Society
Version
Author's final manuscript
Abstract
The capping reagent plays an essential role in the functional properties of gold nanoparticles (AuNPs). Multiple stimuli-responsive materials are generated via diverse surface modification. The ability of the organic ligand shell on a gold surface to create a porous shell capable of binding small molecules is demonstrated as an approach to detect molecules, such as methane, that would be otherwise difficult to sense. Thiols are the most studied capping ligands of AuNPs used in chemiresistors. Phosphine capping groups are usually seen as stabilizers in synthesis and catalysis. However, by virtue of the pyramidal shape of triarylphosphines, they are natural candidates to create intrinsic voids within the ligand shell of AuNPs. In this work, surface-functionalized (capped) AuNPs with chelating phosphine ligands are synthesized via two synthetic routes, enabling chemiresistive methane gas detection at sub-100 ppm levels. These AuNPs are compared to thiol-capped AuNPs, and studies were undertaken to evaluate structure-property relationships for their performance in the detection of hydrocarbons. Polymer overcoatings applied to the conductive networks of the functionalized AuNP arrays were shown to reduce resistivity by promoting the formation of conduction pathways with decreased core-core distance between nanoparticles. Observations made in the context of developing methane sensors provide insight relevant to applications of phosphine or phosphine-containing surface groups in functional AuNP materials.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.1021/acsnano.0c04154
