132110 20240301161205.0 doi 10.1021/acsnano.0c04154 sideral 131579 ART-2020-131579 eng Tang, C. Chelating phosphine ligand stabilized AuNPs in methane detection 2020 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. Access copy available to the general public Unrestricted info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 15.881 2020 CHEMISTRY, PHYSICAL 12 / 162 = 0.074 2020 Q1 T1 NANOSCIENCE & NANOTECHNOLOGY 11 / 106 = 0.104 2020 Q1 T1 CHEMISTRY, MULTIDISCIPLINARY 14 / 178 = 0.079 2020 Q1 T1 MATERIALS SCIENCE, MULTIDISCIPLINARY 21 / 333 = 0.063 2020 Q1 T1 5.554 2020 Engineering (miscellaneous) 2020 Q1 Physics and Astronomy (miscellaneous) 2020 Q1 Nanoscience and Nanotechnology 2020 Q1 Materials Science (miscellaneous) 2020 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Ku, K. H. Lennon Luo, S. X. Concellón, A. (orcid)0000-0002-8932-9085 Wu, Y.-C. M. Lu, R-Q. Swager, T. M. 14, 9 (2020), 11605-11612 ACS Nano ACS NANO 1936-0851 1735405 http://zaguan.unizar.es/record/132110/files/texto_completo.pdf Postprint 3314274 http://zaguan.unizar.es/record/132110/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:132110 articulos driver 2024-03-01-14:47:00 ARTICLE