The shell structure effect on the vapor selectivity of monolayer-protected gold nanoparticle sensors

Rui Xuan Huang, Chia Jung Lu, Wei Cheng Tian

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Four types of monolayer-protected gold nanoclusters (MPCs) were synthesized and characterized as active layers of vapor sensors. An interdigitated microelectrode (IDE) and quartz crystal microbalance (QCM) were used to measure the electrical resistance and mass loading changes of MPC films during vapor sorption. The vapor sensing selectivity was influenced by the ligand structure of the monolayer on the surface of gold nanoparticles. The responses of MPC-coated QCM were mainly determined according to the affinity between the vapors and surface ligands of MPCs. The responses to the resistance changes of the MPC films were due to the effectiveness of the swelling when vapor was absorbed. It was observed that resistive sensitivity to polar organics could be greatly enhanced when the MPC contained ligands that contain interior polar functional groups with exterior nonpolar groups. This finding reveals that reducing interparticle attraction by using non-polar exterior groups could increase effective swelling and therefore enhance the sensitivity of MPC-coated chemiresistors.

Original languageEnglish
Pages (from-to)85-96
Number of pages12
JournalChemosensors
Volume2
Issue number1
DOIs
Publication statusPublished - 2014 Mar 1

Keywords

  • Chemiresistor
  • Gold nanoparticles
  • QCM
  • VOC sensors

ASJC Scopus subject areas

  • Analytical Chemistry
  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'The shell structure effect on the vapor selectivity of monolayer-protected gold nanoparticle sensors'. Together they form a unique fingerprint.

  • Cite this