TY - JOUR
T1 - All villi-like metal oxide nanostructures-based chemiresistive electronic nose for an exhaled breath analyzer
AU - Moon, Hi Gyu
AU - Jung, Youngmo
AU - Han, Soo Deok
AU - Shim, Young Seok
AU - Jung, Woo Suk
AU - Lee, Taikjin
AU - Lee, Seok
AU - Park, Jung Han
AU - Baek, Seung Hyub
AU - Kim, Jin Sang
AU - Park, Hyung Ho
AU - Kim, Chulki
AU - Kang, Chong Yun
N1 - Funding Information:
This work was partly supported by the KIST Institutional Program (Project No. 2E27270), Institute for Information & Communications Technology Promotion (IITP) grant funded by the Korea government (MSIP) (No. R0126-17-1050 , Olfactory Bio Data based Emotion Enhancement Interactive Content Technology Development), the Global Top Project funded by the Korea Ministry of Environment ( GT-11-F-02-002-1 ), and the Energy Efficiency & Resources of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy (No. 20162220100150 ). Appendix A
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018/3
Y1 - 2018/3
N2 - Chemiresistive electronic nose (CEN) composed of villi-like nanostructures (VLNs) of SnO2 and WO3, and Au-functionalized VLNs was fabricated by applying electron-beam evaporation in a glancing angle deposition mode. The VLNs-based CEN with a back-heater (212 °C) shows high responses with low detection limits of parts per billion (ppb)-levels for NO and NH3 vapors at 80% relative humidity atmosphere. The enhanced sensitivities in a high humidity condition turn out to be attributed to the spillover effect by the Au nanoparticles and a large surface-to-volume ratio in porous VLNs. Employing Au NPs on VLNs leads to the increase of O− ions via the spillover effect which impedes the adsorption of water molecules, maintaining the enhanced responses against environmental humidity. Consequently, high responses for NO and NH3 vapors maintain even in the high humidity condition. Herein, with the principal component analysis (PCA), we demonstrate highly selective detection of NO and NH3 vapors against C2H5OH, CO, C7H8, C6H6, and CH3COCH3 vapors. These results open up wide applications of the VLNs-based CEN as an inexpensive and non-invasive diagnostic tool for asthma and kidney disorder.
AB - Chemiresistive electronic nose (CEN) composed of villi-like nanostructures (VLNs) of SnO2 and WO3, and Au-functionalized VLNs was fabricated by applying electron-beam evaporation in a glancing angle deposition mode. The VLNs-based CEN with a back-heater (212 °C) shows high responses with low detection limits of parts per billion (ppb)-levels for NO and NH3 vapors at 80% relative humidity atmosphere. The enhanced sensitivities in a high humidity condition turn out to be attributed to the spillover effect by the Au nanoparticles and a large surface-to-volume ratio in porous VLNs. Employing Au NPs on VLNs leads to the increase of O− ions via the spillover effect which impedes the adsorption of water molecules, maintaining the enhanced responses against environmental humidity. Consequently, high responses for NO and NH3 vapors maintain even in the high humidity condition. Herein, with the principal component analysis (PCA), we demonstrate highly selective detection of NO and NH3 vapors against C2H5OH, CO, C7H8, C6H6, and CH3COCH3 vapors. These results open up wide applications of the VLNs-based CEN as an inexpensive and non-invasive diagnostic tool for asthma and kidney disorder.
KW - Au nanoparticles (Au NPs)
KW - Chemiresistive electronic nose (CEN)
KW - Exhaled breath analyzer
KW - Glancing angle deposition (GAD)
KW - Villi-like nanostructures
UR - http://www.scopus.com/inward/record.url?scp=85032898700&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2017.10.153
DO - 10.1016/j.snb.2017.10.153
M3 - Article
AN - SCOPUS:85032898700
SN - 0925-4005
VL - 257
SP - 295
EP - 302
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
ER -