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The Hidden Heroes: Holes in Charge-Driven Desorption Mass Spectrometry
Yu-Hong Cheng1, Kwan-Ming Ng1,2,3
1Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong S.A.R., P. R. China.
Abstract:
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.
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