Structural stability and performance of noble metal-free sno2-based gas sensors

Antonio Tricoli

doi:10.3390/bios2020221

Structural stability and performance of noble metal-free sno₂-based gas sensors

Antonio Tricoli^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

The structural stability of pure SnO₂ nanoparticles and highly sensitive SnO₂-SiO₂ nanocomposites (0-15 SiO₂ wt%) has been investigated for conditions relevant to their utilization as chemoresistive gas sensors. Thermal stabilization by SiO₂ co-synthesis has been investigated at up to 600 ^oC determining regimes of crystal size stability as a function of SiO₂-content. For operation up to 400 ^oC, thermally stable crystal sizes of ca. 24 and 11 nm were identified for SnO₂ nanoparticles and 1.4 wt% SnO₂-SiO₂ nanocomposites, respectively. The effect of crystal growth during operation (TO = 320 ^oC) on the sensor response to ethanol has been reported, revealing possible long-term destabilization mechanisms. In particular, crystal growth and sintering-neck formation were discussed with respect to their potential to change the sensor response and calibration. Furthermore, the effect of SiO₂ cosynthesis on the cross-sensitivity to humidity of these noble metal-free SnO₂-based gas sensors was assessed.

Original language	English
Pages (from-to)	221-233
Number of pages	13
Journal	Biosensors
Volume	2
Issue number	2
DOIs	https://doi.org/10.3390/bios2020221
Publication status	Published - Jun 2012
Externally published	Yes

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title = "Structural stability and performance of noble metal-free sno2-based gas sensors",

abstract = "The structural stability of pure SnO2 nanoparticles and highly sensitive SnO2-SiO2 nanocomposites (0-15 SiO2 wt%) has been investigated for conditions relevant to their utilization as chemoresistive gas sensors. Thermal stabilization by SiO2 co-synthesis has been investigated at up to 600 oC determining regimes of crystal size stability as a function of SiO2-content. For operation up to 400 oC, thermally stable crystal sizes of ca. 24 and 11 nm were identified for SnO2 nanoparticles and 1.4 wt% SnO2-SiO2 nanocomposites, respectively. The effect of crystal growth during operation (TO = 320 oC) on the sensor response to ethanol has been reported, revealing possible long-term destabilization mechanisms. In particular, crystal growth and sintering-neck formation were discussed with respect to their potential to change the sensor response and calibration. Furthermore, the effect of SiO2 cosynthesis on the cross-sensitivity to humidity of these noble metal-free SnO2-based gas sensors was assessed.",

keywords = "Chemoresistive, Gas sensors, Grain growth, Long-termstability, Nanoparticles, Noble metals, Relative humidity, Semiconductorsm, Sio2, Sno2",

author = "Antonio Tricoli",

year = "2012",

month = jun,

doi = "10.3390/bios2020221",

language = "English",

volume = "2",

pages = "221--233",

journal = "Biosensors",

issn = "2079-6374",

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AU - Tricoli, Antonio

PY - 2012/6

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N2 - The structural stability of pure SnO2 nanoparticles and highly sensitive SnO2-SiO2 nanocomposites (0-15 SiO2 wt%) has been investigated for conditions relevant to their utilization as chemoresistive gas sensors. Thermal stabilization by SiO2 co-synthesis has been investigated at up to 600 oC determining regimes of crystal size stability as a function of SiO2-content. For operation up to 400 oC, thermally stable crystal sizes of ca. 24 and 11 nm were identified for SnO2 nanoparticles and 1.4 wt% SnO2-SiO2 nanocomposites, respectively. The effect of crystal growth during operation (TO = 320 oC) on the sensor response to ethanol has been reported, revealing possible long-term destabilization mechanisms. In particular, crystal growth and sintering-neck formation were discussed with respect to their potential to change the sensor response and calibration. Furthermore, the effect of SiO2 cosynthesis on the cross-sensitivity to humidity of these noble metal-free SnO2-based gas sensors was assessed.

AB - The structural stability of pure SnO2 nanoparticles and highly sensitive SnO2-SiO2 nanocomposites (0-15 SiO2 wt%) has been investigated for conditions relevant to their utilization as chemoresistive gas sensors. Thermal stabilization by SiO2 co-synthesis has been investigated at up to 600 oC determining regimes of crystal size stability as a function of SiO2-content. For operation up to 400 oC, thermally stable crystal sizes of ca. 24 and 11 nm were identified for SnO2 nanoparticles and 1.4 wt% SnO2-SiO2 nanocomposites, respectively. The effect of crystal growth during operation (TO = 320 oC) on the sensor response to ethanol has been reported, revealing possible long-term destabilization mechanisms. In particular, crystal growth and sintering-neck formation were discussed with respect to their potential to change the sensor response and calibration. Furthermore, the effect of SiO2 cosynthesis on the cross-sensitivity to humidity of these noble metal-free SnO2-based gas sensors was assessed.

KW - Chemoresistive

KW - Gas sensors

KW - Grain growth

KW - Long-termstability

KW - Nanoparticles

KW - Noble metals

KW - Relative humidity

KW - Semiconductorsm

KW - Sio2

KW - Sno2

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U2 - 10.3390/bios2020221

DO - 10.3390/bios2020221

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SN - 2079-6374

VL - 2

SP - 221

EP - 233

JO - Biosensors

JF - Biosensors

IS - 2

ER -

Structural stability and performance of noble metal-free sno₂-based gas sensors

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