Journal
ACS NANO
Volume 4, Issue 8, Pages 4487-4494Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn100435h
Keywords
SnO2 nanobelt; nanosensor; nanowire electronic nose; gas recognition
Categories
Funding
- INTAS
- Fulbright Scholarship
- Caterpillar Inc.
- NSF [ECCS-0925837]
- Interconnect Focus Center NY at RPI
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Electronic instruments mimicking the mammalian olfactory system are often referred to as electronic noses (E-noses). Thanks to recent nanotechnology breakthroughs the fabrication of mesoscopic and even nanoscopic E-noses is now feasible in the size domain where miniaturization of the microanalytical systems encounters principal limitations. Here we describe probably the simplest and yet fully functioning E-nose made of an individual single-crystal metal oxide quasi-1D nanobelt. The nanobelt was indexed with a number of electrodes in a way that each segment of the nanobelt between two electrodes defines an individual sensing elemental receptor of the array. The required diversity of the sensing elements is encoded in the nanobelt morphology via longitudinal width variations of the nanobelt realized during its growth and via functionalization of some of the segments with Pd catalyst. The proposed approach represents the combined bottom-up/top-down technologically viable route to develop robust and sensitive analytical systems scalable down to submicrometer dimensions.
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