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Electrical Characterization of Self-Assembled 1D Gold Nanoparticle Chains : Implications for Chemiresistor Sensors

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2024

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Deutsche Forschungsgemeinschaft (DFG): 510996696

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Partikelanalysezentrum, Nanostrukturlabor

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ACS Applied Nano Materials. ACS Publications. 2024, 7(17), S. 20775-20782. ISSN 2574-0970. eISSN 2574-0970. Verfügbar unter: doi: 10.1021/acsanm.4c03713

Zusammenfassung

The introduction of dipoles on gold nanoparticle surfaces provides the formation of chain-like nanoparticle assemblies in solution under ambient conditions. Here, we present studies on influencing and controlling the strength of the induced dipole by thiols. Aromatic thiols lead to enhanced surface dipoles, where electron-donating functions can further increase the interaction. Thereby, particle–particle distances and chemical environment at the particle interface were manipulated, which resulted in different tunneling resistances Rg in these 1D structures. Here, Rg seemed to be mostly dominated by the interparticle distance rather than the type of ligand. Temperature-dependent current–voltage measurements of thiol-bearing nanoparticle chains revealed two different transport mechanisms. For temperatures <170 K, a thermally activated electron tunneling takes place, which depends on the charging energy Ec. Whereas for higher temperatures, a transition to an electron hopping process occurs determined by the involved thiol and nanoparticle shape. For structures with strong interparticle electronic coupling, the conduction mechanism is almost temperature-independent, which makes them promising candidates for highly sensitive chemiresistor sensors.

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ISO 690SCHUPP, Stefan, David Joshua SCHUPP, Holger HILBERT, Emil SCHWARZ, Rebecca KÖSER, Helmut CÖLFEN, Lukas SCHMIDT-MENDE, 2024. Electrical Characterization of Self-Assembled 1D Gold Nanoparticle Chains : Implications for Chemiresistor Sensors. In: ACS Applied Nano Materials. ACS Publications. 2024, 7(17), S. 20775-20782. ISSN 2574-0970. eISSN 2574-0970. Verfügbar unter: doi: 10.1021/acsanm.4c03713
BibTex
@article{Schupp2024-09-13Elect-70675,
  year={2024},
  doi={10.1021/acsanm.4c03713},
  title={Electrical Characterization of Self-Assembled 1D Gold Nanoparticle Chains : Implications for Chemiresistor Sensors},
  number={17},
  volume={7},
  issn={2574-0970},
  journal={ACS Applied Nano Materials},
  pages={20775--20782},
  author={Schupp, Stefan and Schupp, David Joshua and Hilbert, Holger and Schwarz, Emil and Köser, Rebecca and Cölfen, Helmut and Schmidt-Mende, Lukas}
}
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