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Metal‐Insulator Transition‐Induced Adsorption‐Resistant Behavior of Small Au Nanoparticles
Author(s) -
Kim HyoSang,
Shin SunYoung,
Uhm Sanghoon,
Han JinHee,
Hwang HanNa,
Kim Bongsoo,
Chung Jinwook,
Kim Young D.,
Hwang ChanCuk
Publication year - 2009
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200900001
Subject(s) - nanoparticle , chemisorption , x ray photoelectron spectroscopy , adsorption , materials science , metal , photoemission spectroscopy , transition metal , ultraviolet photoelectron spectroscopy , reactivity (psychology) , oxide , particle size , chemistry , inorganic chemistry , analytical chemistry (journal) , chemical engineering , nanotechnology , catalysis , organic chemistry , medicine , alternative medicine , pathology , engineering , metallurgy
Smaller nonmetallic nanoparticles are more inert: Metal–insulator transition of Au nanoparticles on silica is closely related to the metal–support charge transfer, which has a strong influence on chemisorption reactivity of Au. Smaller nonmetallic Au nanoparticles are more resistant towards butanethiol chemisorption (see picture and graph).The size‐dependent variation of the electronic and chemical properties of Au nanoparticles formed on native Si oxide surfaces is investigated using synchrotron radiation photoemission spectroscopy and ultraviolet photoelectron spectroscopy. The adsorption reactivity toward butanethiol adsorption initially increases with decreasing particle size; however, the reactivity of Au nanoparticles becomes gradually lower below a size of ∼0.8 nm. The photoemission spectral changes suggest a metal–insulator transition, accompanied by negative charge transfer from the nanoparticles to the support, which may be the source of the chemical inertness of small Au nanoparticles.