Vertically aligned ZnO nanorods and graphene hybrid architectures for high-sensitive flexible gas sensors

Yi, Jaeseok; Lee, Jung Min; Park, Won Il

doi:10.1016/j.snb.2010.12.033

Cited by 277 publications

(146 citation statements)

References 39 publications

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“…14 A suspended graphene contact on ZnO nanowires has been used to fabricate flexible and transparent gas sensors. 15 ZnO nanowire ensemble/graphene photodetector based on a Schottky diode operation principle has been reported recently with a responsivity around 100 A/W. 16 A higher responsivity can be achieved with a photoconductive device by taking advantage of a high photoconductive gain in nanowires.…”

Section: Introductionmentioning

confidence: 99%

Characterization and modeling of a ZnO nanowire ultraviolet photodetector with graphene transparent contact

Zhang

Babichev

Jacopin

et al. 2013

Journal of Applied Physics

108

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We report the demonstration of a ZnO nanowire ultraviolet photodetector with a top transparent electrode made of a few-layered graphene sheet. The nanowires have been synthesized using a lowcost electrodeposition method. The detector is shown to be visible-blind and to present a responsivity larger than 10 4 A/W in the near ultraviolet range thanks to a high photoconductive gain in ZnO nanowires. The device exhibits a peak responsivity at 370 nm wavelength and shows a sub bandgap response down to 415 nm explained by an Urbach tail with a characteristic energy of 83 meV. The temporal response of the detector and the power dependence are discussed. A model of the photoconductive mechanism is proposed showing that the main process responsible for the photoconductive gain is the modulation of the conducting surface due to the variation of the surface depletion layer and not the reduction of recombination efficiency stemming from the electron-hole spatial separation. The gain is predicted to decrease at high incident power due to the flattening of the lateral band bending in agreement with experimental data. V C 2013 AIP Publishing LLC.

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Section: Introductionmentioning

confidence: 99%

Characterization and modeling of a ZnO nanowire ultraviolet photodetector with graphene transparent contact

Zhang

Babichev

Jacopin

et al. 2013

Journal of Applied Physics

108

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“…Chemosensors 2016, 4, 15 7 of 10 Figure 9 shows the response plot as a function of the H2S concentration in ppm. These sensors are capable of detecting H2S concentrations as low as 6 ppm.…”

Section: Gas Sensor Characteristicsmentioning

confidence: 99%

“…These devices require new features such as low-power consumption, low-cost and low-weight in addition than good sensitivity, selectivity and stability. In particular, the use of substrates flexible for manufacturing gas sensors could be a potential alternative to the more expensive silicon technology [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

TiO2 Nanotubes Membrane Flexible Sensor for Low-Temperature H2S Detection

Perillo

Rodríguez

2016

Chemosensors

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This paper presents the fabrication and characterization of a flexible gas sensor based on TiO 2 nanotubes membrane, onto which array interdigitated gold electrodes in one side and a common heater in the backside were obtained using conventional microfabrication techniques. This was used to detect hydrogen sulphide within a concentration range of 6-38 ppm. The response to low concentrations of H 2 S at low temperature and good stability make the sensor a promising candidate for practical applications. These results support the proposal that the TiO 2 nanotubes membrane flexible sensors are promising in portable on-site detection based on low cost nanomaterials.

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“…One-dimensional (1-D) metal oxide (MO) nanostructures have attracted much attention in fabricating unique optoelectronic, electronic, and electrochemical devices such as UV sensors 1 , solar cells 2 , and gas sensors 3 . It pertains to those applications that nanorods possess relatively large aspect ratio and relatively large surface area to volume ratio ensuring high efficiency and sensitivity.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, ZnO is expected to exhibits faster electron transport with reduced recombination loss. Different types of ZnO nanostructures have been used as gas sensors to detect gases, vapors, and metal ions, such as ethanol 3,5 , NH 3 6 , O 2 7 , and Ca + 8 .…”

Section: Introductionmentioning

confidence: 99%

CuO/ZnO Nanocorals synthesis via hydrothermal technique: growth mechanism and their application as Humidity Sensor

et al. 2012

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We demonstrate hydrothermal synthesis of coral-like CuO nanostructures by selective growth on ZnO nanorods (NR) at low temperatures. During the hydrothermal processing the resultant hydroxylated and eroded surface of ZnO NR becomes favorable for the CuO nanostructures growth via oriented attachments. Heterojunction p-n diodes fabricated from the CuO/ZnO nanocorals (NC) reveal stable and high rectification diode properties with a turn-on voltage ~1.52 V and negligible reverse current. The humidity sensing characteristics of the CuO/ZnO NC diodes exhibit a remarkable linear (in a semilogarithmic scale) decrease in the DC resistance by more than three orders when the relative humidity is changed from 30 -90 %. The NC humidity sensor is also found to reveal the highest sensitivity factor ~6045 among available data for the constituent material's and a response and recovery time of 6 s and 7 s, respectively.

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Vertically aligned ZnO nanorods and graphene hybrid architectures for high-sensitive flexible gas sensors

Cited by 277 publications

References 39 publications

Characterization and modeling of a ZnO nanowire ultraviolet photodetector with graphene transparent contact

Characterization and modeling of a ZnO nanowire ultraviolet photodetector with graphene transparent contact

TiO2 Nanotubes Membrane Flexible Sensor for Low-Temperature H2S Detection

CuO/ZnO Nanocorals synthesis via hydrothermal technique: growth mechanism and their application as Humidity Sensor

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