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Modulation of Electron Tunneling in a Nanoparticle Array by Sound Waves: An Avenue to High‐Speed, High‐Sensitivity Sensors
Author(s) -
Berry Vikas,
Saraf Ravi F.
Publication year - 2011
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201100519
Subject(s) - materials science , nanoparticle , polyelectrolyte , dielectric , quantum tunnelling , ultrashort pulse , humidity , relative humidity , modulation (music) , sensitivity (control systems) , nanotechnology , optoelectronics , polymer , composite material , optics , acoustics , laser , physics , engineering , electronic engineering , thermodynamics
Using an electrostatic self‐assembly process, metal nanoparticles are deposited on polyelectrolyte fibers such that the interparticle distance between the nanoparticles is comparable to the polyelectrolyte's molecular width. By modulating the dielectric properties of the interparticle polymer layer, a highly sensitive, reversible humidity sensor with an ultrafast response time of ≈3 ms is demonstrated. The higher sensitivity at low humidity shows a conductivity increase by over two orders of magnitude in response to a change in relative humidity from 21 to 1%.