Layer-by-layer thin film of reduced graphene oxide and gold nanoparticles as an effective sample plate in laser-induced desorption/ionization mass spectrometry

Tsung Rong Kuo, Di Yan Wang, Yu Chen Chiu, Yun Chieh Yeh, Wei Ting Chen, Ching Hui Chen, Chun Wei Chen, Huan Cheng Chang, Cho Chun Hu, Chia Chun Chen

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

This work demonstrated a simple platform for rapid and effective surface-assisted laser desorption/ionization time-of-flight mass spectrometry (SALDI-TOF MS) measurements based on the layer structure of reduced graphene oxide (rGO) and gold nanoparticles. A multi-layer thin film was fabricated by alternate layer-by-layer depositions of rGO and gold nanoparticles (LBL rGO/AuNP). The flat and clean two-dimensional film was served as the sample plate and also functioned as the matrix in SALDI-TOF MS. By simply one-step deposition of analytes onto the LBL rGO/AuNP sample plate, the MS measurements of various homogeneous samples were ready to execute. The optimization of MS signal was reached by the variation of the layer numbers of rGO and gold nanoparticles. Also, the small molecules including amino acids, carbohydrates and peptides were successfully analyzed in SALDI-TOF MS using the LBL rGO/AuNP sample plate. The results showed that the signal intensity, SN-1 ratio and reproducibility of SALDI-TOF spectra have been significantly improved in comparison to the uses of gold nanoparticles or α-cyano-4-hydroxy-cinnamic acid (CHCA) as the assisted matrixes. Taking the advantages of the unique properties of rGO and gold nanoparticles, the ready-to-use MS sample plate, which could absorb and dissipate laser energy to analytes quite efficiently and homogeneously, has shown great commercial potentials for MS applications.

Original languageEnglish
Pages (from-to)97-103
Number of pages7
JournalAnalytica Chimica Acta
Volume809
DOIs
Publication statusPublished - 2014 Jan 27

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Keywords

  • Gold nanoparticles
  • Laser-induced desorption/ionization mass spectrometry
  • Multi-layer thin film
  • Reduced graphene oxide
  • Sample plate

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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