Capacitive humidity sensing properties of ZnO cauliflowers grown on silicon nanoporous pillar array

Wang, Ling Li; Wang, Hai Yan; Wang, Wen Chuang; Li, Kun; Wang, Xin Chang; Li, Xin Jian

doi:10.1016/j.snb.2012.11.070

Cited by 41 publications

(15 citation statements)

References 35 publications

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“…This result indicates that the hysteresis of our developed CMFTO electro-ceramic based humidity sensor is relatively lower than that of other different capacitive humidity sensors (i.e., ~4.16% for ZnO/Si-based, ~4.5% for SiC nanowire-based, ~4% for alumina nanowire-based, ~5% for graphene oxide-based, ~12% for (PEPC + NiPc + Cu 2 O)-based and so on) developed by other studies reported elsewhere [16,54,59,60,66]. The lower hysteresis value was obtained owing to the relatively faster adsorption and desorption rate of water molecules on the surface of the CMFTO electro-ceramic in comparison to the other materials [54,55].…”

Section: Resultsmentioning

confidence: 80%

Design and Development for Capacitive Humidity Sensor Applications of Lead-Free Ca,Mg,Fe,Ti-Oxides-Based Electro-Ceramics with Improved Sensing Properties via Physisorption

Tripathy

Pramanik

Manna

et al. 2016

Sensors

116

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Despite the many attractive potential uses of ceramic materials as humidity sensors, some unavoidable drawbacks, including toxicity, poor biocompatibility, long response and recovery times, low sensitivity and high hysteresis have stymied the use of these materials in advanced applications. Therefore, in present investigation, we developed a capacitive humidity sensor using lead-free Ca,Mg,Fe,Ti-Oxide (CMFTO)-based electro-ceramics with perovskite structures synthesized by solid-state step-sintering. This technique helps maintain the submicron size porous morphology of the developed lead-free CMFTO electro-ceramics while providing enhanced water physisorption behaviour. In comparison with conventional capacitive humidity sensors, the presented CMFTO-based humidity sensor shows a high sensitivity of up to 3000% compared to other materials, even at lower signal frequency. The best also shows a rapid response (14.5 s) and recovery (34.27 s), and very low hysteresis (3.2%) in a 33%–95% relative humidity range which are much lower values than those of existing conventional sensors. Therefore, CMFTO nano-electro-ceramics appear to be very promising materials for fabricating high-performance capacitive humidity sensors.

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Section: Resultsmentioning

confidence: 80%

Design and Development for Capacitive Humidity Sensor Applications of Lead-Free Ca,Mg,Fe,Ti-Oxides-Based Electro-Ceramics with Improved Sensing Properties via Physisorption

Tripathy

Pramanik

Manna

et al. 2016

Sensors

116

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“…Being an important material in the family of n-type semiconductors, zinc oxide (ZnO) has attracted the interest of many researchers for its use in fabrication of RH sensors [26][27][28][29]. The water molecules get adsorbed on the surface of ZnO in molecular and hydroxyl form and causes electrical conduction at room temperature.…”

Section: Introductionmentioning

confidence: 99%

One pot synthesis of mesoporous ZnO–SiO 2 nanocomposite as high performance humidity sensor

Tomer

Duhan

Sharma

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Zinc oxide (ZnO) is one of the most promising metal oxide semiconductors for sensing applications . Its wide band gap and large exciton binding energy induces exceptional electrical/optoelectronic properties and hence adsorption of water molecules in molecular and hydroxyl form on surface causes it to conduct electrically at room temperature.…”

Section: Introductionmentioning

confidence: 99%

“…[16][17][18][19][20] Zinc oxide (ZnO) is one of the most promising metal oxide semiconductors for sensing applications. [21][22][23] Its wide band gap and large exciton binding energy induces exceptional electrical/optoelectronic properties and hence adsorption of water molecules in molecular and hydroxyl form on surface causes it to conduct electrically at room temperature. It has been observed that ZnO nanostructures with high surface/ volume ratio possess more chemically active sites and shows improved performance towards sensing and catalysis applications.…”

Section: Introductionmentioning

confidence: 99%

A Novel Highly Sensitive Humidity Sensor Based on ZnO/SBA‐15 Hybrid Nanocomposite

et al. 2015

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This work deals with the study of hydrothermally synthesized zinc oxide (ZnO) loaded mesoporous SBA‐15 hybrid nanocomposite for relative humidity sensing (RH) at room temperature. The sensor exhibits an excellent ~5 orders impedance change along with excellent linearity, quick response time (17 s), rapid recovery time (18 s), negligible hysteresis (1.2%), good repeatability, and stability (1.8%) in 11%–98% RH range. In addition, complex impedance spectra of the sensor at different RHs were analyzed to understand the humidity sensing mechanism. Our study can open a new way for realizing ZnO/SBA‐15 hybrid nanocomposite for fabrication of high‐performance RH sensors.

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Capacitive humidity sensing properties of ZnO cauliflowers grown on silicon nanoporous pillar array

Cited by 41 publications

References 35 publications

Design and Development for Capacitive Humidity Sensor Applications of Lead-Free Ca,Mg,Fe,Ti-Oxides-Based Electro-Ceramics with Improved Sensing Properties via Physisorption

Design and Development for Capacitive Humidity Sensor Applications of Lead-Free Ca,Mg,Fe,Ti-Oxides-Based Electro-Ceramics with Improved Sensing Properties via Physisorption

One pot synthesis of mesoporous ZnO–SiO 2 nanocomposite as high performance humidity sensor

A Novel Highly Sensitive Humidity Sensor Based on ZnO/SBA‐15 Hybrid Nanocomposite

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