Room-temperature hydrogen gas sensor with ZnO nanorod arrays grown on a quartz substrate

Hassan, J.J.; Mahdi, M.A.; Chin, C.W.; Abu-Hassan, H.; Hassan, Z.

doi:10.1016/j.physe.2012.08.013

Cited by 16 publications

(12 citation statements)

References 30 publications

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“…Hassan et al have reported that ZnO nanorods were produced with the microwave-assisted chemical bath deposition method. They used Polyvinylalcohol (PVA)-Zn(OH) 2 nanocomposite as a seed layer and they have carried out the hydrogen gas sensing measurements at room temperature and reported that using a seed layer made the sensors work at low operating temperatures [61]. The optimal operating temperature was found at 80 °C and 140 °C for the ZnO seed layer-based sensor and glass slide-based sensor.…”

Section: H 2 Gas Sensing Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Substrate critical effect on the structural and H₂Gas sensing characteristics of solution-processed Zn_0.075Cu_0.025O films

Özütok

Yakar

et al. 2021

Mater. Res. Express

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In this study, we report the synthesis of Zn0.075Cu0.025O films by chemical bath deposition to determine the effect of substrate (glass slide or ZnO seed layer) on the structural and H2 gas sensing properties of the produced films. The crystal phase, structural topography, surface morphology and functional groups of the as-synthesized films as well as H2 gas sensing properties were investigated. Although both films have a hexagonal wurtzite structure, ZnO seed layer-based Zn0.075Cu0.025O film is more crystalline than glass slide-based Zn0.075Cu0.025O films. ZnO seed layer-based Zn0.075Cu0.025O films exhibited much more nanorod and less nanosphere forms compared to glass slide-based Zn0.075Cu0.025O films. EDX analysis and Raman spectra of both samples confirmed the presence of defects in Cu:ZnO samples. ZnO seed layer-based sensors showed higher response (140%) and lower operating temperature (80°C) compared to glass slide-based sensors (87% response and 140°C operating temperature). The most important thing to note here is that the fabricated sensors exhibited high response at room temperature. The responses at room temperature was found as 46% and 23% for the ZnO seed layer-based and glass slide-based sensors, respectively. Sensors operating at room temperature are especially important for commercial applications.

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Section: H 2 Gas Sensing Propertiesmentioning

confidence: 99%

“…There is an exchange of electrons from the lower ZnO seed layer to the upper layer, thus increasing the number of free electrons in the structure which results in an n-n heterostructure. Studies in this form are also available in the literature [61].…”

Section: H 2 Gas Sensing Propertiesmentioning

confidence: 99%

Substrate critical effect on the structural and H₂Gas sensing characteristics of solution-processed Zn_0.075Cu_0.025O films

Özütok

Yakar

et al. 2021

Mater. Res. Express

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“…One interesting method is the hydrothermal synthesis under microwave radiation since it is a low-cost, low-temperature, and fast method, yet allowing a high yield production of hexagonal wurtzite structures [46,64]. Despite the advantages, ZnO NRs produced through this method have been essentially explored for UV sensors [46,51,65,66], gas sensors [67][68][69][70], and photocatalysis [49,71,72], yet not for NGs.…”

Section: Introductionmentioning

confidence: 99%

Optimization of ZnO Nanorods Concentration in a Micro-Structured Polymeric Composite for Nanogenerators

et al. 2021

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The growing use of wearable devices has been stimulating research efforts in the development of energy harvesters as more portable and practical energy sources alternatives. The field of piezoelectric nanogenerators (PENGs) and triboelectric nanogenerators (TENGs), especially employing zinc oxide (ZnO) nanowires (NWs), has greatly flourished in recent years. Despite its modest piezoelectric coefficient, ZnO is very attractive due to its sustainable raw materials and the facility to obtain distinct morphologies, which increases its multifunctionality. The integration of ZnO nanostructures into polymeric matrices to overcome their fragility has already been proven to be fruitful, nevertheless, their concentration in the composite should be optimized to maximize the harvesters’ output, an aspect that has not been properly addressed. This work studies a composite with variable concentrations of ZnO nanorods (NRs), grown by microwave radiation assisted hydrothermal synthesis, and polydimethylsiloxane (PDMS). With a 25 wt % ZnO NRs concentration in a composite that was further micro-structured through laser engraving for output enhancement, a nanogenerator (NG) was fabricated with an output of 6 V at a pushing force of 2.3 N. The energy generated by the NG could be stored and later employed to power small electronic devices, ultimately illustrating its potential as an energy harvesting device.

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“…Thin films and nanomaterials are suitable for gas sensors because the sensing properties are related to the material surface where the gases are adsorbed and surface reactions occur. Surface reactions change the concentration of charge carriers in the material, creating a depletion layer and surface dipole at the interface, which results in a change in electrical resistance [ 2 – 4 , 10 , 18 , 21 – 23 ]. The high sensitivity of ZnO thin film gas elements has been attributed to reactions at grain boundaries and the metal/ZnO interface, where the depletion of carriers modifies the material transport properties [ 2 – 4 , 18 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Embedded Pd Microstructures on the Flat-Band-Voltage Operation of Room Temperature ZnO-Based Liquid Petroleum Gas Sensors

Ali

Thompson

Jasim

et al. 2013

Sensors

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Three methods were used to fabricate ZnO-based room temperature liquid petroleum gas (LPG) sensors having interdigitated metal-semiconductor-metal (MSM) structures. Specifically, devices with Pd Schottky contacts were fabricated with: (1) un-doped ZnO active layers; (2) Pd-doped ZnO active layers; and (3) un-doped ZnO layers on top of Pd microstructure arrays. All ZnO films were grown on p-type Si(111) substrates by the sol-gel method. For devices incorporating a microstructure array, Pd islands were first grown on the substrate by thermal evaporation using a 100 μm mesh shadow mask. We have estimated the sensitivity of the sensors for applied voltage from –5 to 5 V in air ambient, as well as with exposure to LPG in concentrations from 500 to 3,500 ppm at room temperature (300 K). The current-voltage characteristics were studied and parameters such as leakage current, barrier height, reach-through voltage, and flat-band voltage were extracted. We include contributions due to the barrier height dependence on the electric field and tunneling through the barrier for the studied MSM devices. The Pd-enhanced devices demonstrated a maximum gas response at flat-band voltages. The study also revealed that active layers consisting of Pd microstructure embedded ZnO films resulted in devices exhibiting greater gas-response as compared to those using Pd-doped ZnO thin films or un-doped active layers.

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Room-temperature hydrogen gas sensor with ZnO nanorod arrays grown on a quartz substrate

Cited by 16 publications

References 30 publications

Substrate critical effect on the structural and H₂Gas sensing characteristics of solution-processed Zn_0.075Cu_0.025O films

Substrate critical effect on the structural and H₂Gas sensing characteristics of solution-processed Zn_0.075Cu_0.025O films

Optimization of ZnO Nanorods Concentration in a Micro-Structured Polymeric Composite for Nanogenerators

Effect of Embedded Pd Microstructures on the Flat-Band-Voltage Operation of Room Temperature ZnO-Based Liquid Petroleum Gas Sensors

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Room-temperature hydrogen gas sensor with ZnO nanorod arrays grown on a quartz substrate

Cited by 16 publications

References 30 publications

Substrate critical effect on the structural and H2Gas sensing characteristics of solution-processed Zn0.075Cu0.025O films

Substrate critical effect on the structural and H2Gas sensing characteristics of solution-processed Zn0.075Cu0.025O films

Optimization of ZnO Nanorods Concentration in a Micro-Structured Polymeric Composite for Nanogenerators

Effect of Embedded Pd Microstructures on the Flat-Band-Voltage Operation of Room Temperature ZnO-Based Liquid Petroleum Gas Sensors

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Product

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Substrate critical effect on the structural and H₂Gas sensing characteristics of solution-processed Zn_0.075Cu_0.025O films

Substrate critical effect on the structural and H₂Gas sensing characteristics of solution-processed Zn_0.075Cu_0.025O films