Near-Field-Induced Ionization on Photo-Excited Gold Nanoparticles

被引：3

作者：

Huang, Wei ^{[4
,5
]}

Lai, Samuel Kin-Man ^{[1
,2
]}

Liang, Kaiqing ^{[4
,5
]}

Pu, Keyuan ^{[4
,5
]}

Wang, Xin ^{[3
]}

Chen, Yuping ^{[3
]}

Ng, Kwan-Ming ^{[1
,2
,4
,5
,6
]}

机构：

[1] Univ Hong Kong, Dept Chem, Pokfulam Rd, Hong Kong, Peoples R China

[2] Univ Hong Kong, State Key Lab Synthet Chem, Pokfulam Rd, Hong Kong, Peoples R China

[3] Shantou Univ, Med Coll, Canc Hosp, Shantou 515041, Guangdong, Peoples R China

[4] Shantou Univ, Dept Chem, Shantou 515063, Guangdong, Peoples R China

[5] Shantou Univ, Key Lab Preparat & Applicat Ordered Struct Mat Gua, Shantou 515063, Guangdong, Peoples R China

[6] Chem & Chem Engn Guangdong Lab, Shantou 515063, Guangdong, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2023年 / 127卷 / 22期

关键词：

SURFACE-PLASMON RESONANCE; LASER-DESORPTION-IONIZATION; DESORPTION/IONIZATION; SIZE; NANOSTRUCTURES;

D O I：

10.1021/acs.jpcc.3c01164

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Gold nanoparticles (AuNPs) have been widely utilizedas an effectivesubstrate for triggering molecular ionization upon photoexcitation.However, its underlying mechanism(s) remains unclear. Here, by blockingheat transfer and electron transfer on photo-excited AuNPs with athin layer of silica shell (i.e., Au@SiO2 NPs), the criticalrole of the enhanced E-field in ionizing nearby molecules was evidenced.The enhanced E-field of the Au core could enhance the protonationof amino acids (via short-range interaction) by polarizing the analytemolecules. In contrast, the polarizability of the Au core showed amore pronounced effect to enhance the metal cationization process(Na+ and K+ adduction via long-range interaction)by polarizing both the analyte molecules and metal ions and was successfullyapplied to the sensitive analysis of amino acids in human serum.

引用

页码：10508 / 10514

页数：7

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