Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong S.A.R., P. R. China.
Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Guangdong 515063, P. R. China.
Anal Chem. 2020 Apr 21;92(8):5645-5649. doi: 10.1021/acs.analchem.0c00036. Epub 2020 Feb 27.
Photoexcited hot carriers have high impacts on various fields. However, in contrast to the attention attracted by the hot-electrons, the contributions of holes are seldom recognized. Yet, by simply removing the hot-electrons but retaining the holes on the surface of photoexcited plasmonic gold nanoparticles, a 60-fold ion intensity amplification could be achieved in laser desorption ionization mass spectrometry. A new desorption mechanism termed "charge-driven desorption" has been derived to rationalize the significant improvement.
光激发的热载流子对各个领域都有很大的影响。然而，与热电子引起的关注形成鲜明对比的是，空穴的贡献很少得到认可。但是，通过简单地去除光激发等离子体金纳米粒子表面的热电子而保留空穴，激光解吸电离质谱中离子强度可放大 60 倍。为了合理化这种显著的改善，提出了一种新的解吸机制，称为“电荷驱动解吸”。
