Ion-Desorption Efficiency and Internal-Energy Transfer in Surface-Assisted Laser Desorption/Ionization: More Implication(s) for the Thermal-Driven and Phase-Transition-Driven Desorption Process

Ng, Kwan-Ming1; Chau, Siu-Leung1; Tang, Ho-Wai1; Wei, Xi-Guang2; Lau, Kai-Chung2; Ye, Fei3; Ng, Alan Man-Ching3

2015-10-15

10.1021/acs.jpcc.5b05957

Journal of Physical Chemistry C   影响因子和分区

1932-7447

Fundamental factors governing the ion-desorption efficiency and extent of internal-energy transfer to a chemical thermometer, benzylpyridinium ion ([BP](+)), generated in the surface-assisted laser desorption/ionization (SALDI) process, were systematically investigated using noble metal nanopartides (NPs), including AuNPs, AgNPs, PdNPs, and PtNPs, as substrates, with an average particle size of 1.7-3.1 nm in diameter. In the correlation of ion-desorption efficiency and internal-energy transfer with physicochemical properties of the NPs, laser-induced heating of the NPs, which are dependent on their photoabsorption efficiencies, was found to be a key factor in governing the ion-desorption efficiency and the extent of internal-energy transfer. This suggested that the thermal-driven desorption played a significant role in the ion-desorption process. In addition, a stronger binding affinity of [BP](+) to the surface of the NPs could hinder its desorption from the NPs, and this could be another factor in determining the ion-desorption efficiency. Moreover, metal NPs with lower melting points could also facilitate the ion-desorption process via the phase-transition process, which could lower the activation barrier (Delta G(#)) of the ion-desorption process by increasing the entropic change (Delta S-#). The study reveals that high photoabsorption efficiency, weak binding interaction with analyte molecule, and low melting point could be critical for the design of SALDI substrates with efficient ion desorption.

SCI ; EI

英语

其他

General Research Fund of the Hong Kong Research Grants Council[HKU_704511P] ; General Research Fund of the Hong Kong Research Grants Council[17304014]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000363068400048

AMER CHEMICAL SOC

20154301417860

Binding energy ; Energy transfer ; Ions ; Melting point ; Metal nanoparticles ; Particle size ; Physicochemical properties ; Precious metals ; Radiation

Precious Metals:547.1 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Chemical Operations:802.3 ; Physical Properties of Gases, Liquids and Solids:931.2

Web of Science

1.Univ Hong Kong, Dept Chem, Hong Kong, Hong Kong, Peoples R China
2.City Univ Hong Kong, Dept Biol & Chem, Hong Kong, Hong Kong, Peoples R China
3.South Univ Sci & Technol China, Dept Phys, Shenzhen, Guangdong, Peoples R China

Ng, Kwan-Ming,Chau, Siu-Leung,Tang, Ho-Wai,et al. Ion-Desorption Efficiency and Internal-Energy Transfer in Surface-Assisted Laser Desorption/Ionization: More Implication(s) for the Thermal-Driven and Phase-Transition-Driven Desorption Process[J]. Journal of Physical Chemistry C,2015,119(41):23708-23720.

Ng, Kwan-Ming.,Chau, Siu-Leung.,Tang, Ho-Wai.,Wei, Xi-Guang.,Lau, Kai-Chung.,...&Ng, Alan Man-Ching.(2015).Ion-Desorption Efficiency and Internal-Energy Transfer in Surface-Assisted Laser Desorption/Ionization: More Implication(s) for the Thermal-Driven and Phase-Transition-Driven Desorption Process.Journal of Physical Chemistry C,119(41),23708-23720.

Ng, Kwan-Ming,et al."Ion-Desorption Efficiency and Internal-Energy Transfer in Surface-Assisted Laser Desorption/Ionization: More Implication(s) for the Thermal-Driven and Phase-Transition-Driven Desorption Process".Journal of Physical Chemistry C 119.41(2015):23708-23720.