An enhanced gas ionization sensor from Y-doped vertically aligned conductive ZnO nanorods

Lee, Wei Cheat; Fang, Yuanxing; Turner, John F.; Bedi, Jasbir Singh; Perry, Christopher C.; Qiu, Rong; Chen, Qiao

doi:10.1016/j.snb.2016.06.146

Cited by 36 publications

(33 citation statements)

References 56 publications

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“…The ZnO-sensing performance can be effectively improved by doping with transition metal elements. Vertically aligned yttrium-doped ZnO nanorod (YZO NR) arrays were synthesized by a one-pot hydrothermal method [30]. The Y doping concentration strongly influences the surface morphology of the NRs.…”

Section: Dopingmentioning

confidence: 99%

ZnO Nanorods for Gas Sensors

Wang¹

2020

Nanorods and Nanocomposites

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ZnO nanorods have been widely used to detect low-concentration gases due to its range of conductance variability, response toward both oxidative and reductive gases, and highly sensitive and selective properties. In this chapter, the fabrication methods of ZnO nanorods, their controllable growth, their different configurations, their modification for improving sensing property, and their composites for gas sensors are thoroughly introduced. The synthesis methods to fabricate ZnO nanorods consist of hydrothermal method, microemulsion synthesis, microwaveassisted hydrolysis preparation, gas-solution-solid method, spray pyrolysis, sonochemical route, simple solution route, and so on. The controllable fabrication of ZnO nanorods can be realized by control growth, selective growth, and diameter regulation. Different structures formed by ZnO nanorods include cross-linked configuration, flowerlike structure, and multishelled hollow spheres and hollow microsemispheres, as influence their sensing properties. ZnO nanorods can be modified by doping, functionalization, decoration, and sensitization for enhancing the sensing property. ZnO can be combined with graphene, carbon nanotubes, SnO 2 , In 2 O 3 , and Fe 2 O 3 to form core-shell composites for gas sensor.

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Section: Dopingmentioning

confidence: 99%

ZnO Nanorods for Gas Sensors

Wang¹

2020

Nanorods and Nanocomposites

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“…[11] This demonstration reveals the significance of an anostructured design for conjugated polymer photoanodes in solar-driven water-splitting applications by addressing the major issues of charge carrier generation and transport. Such photoelectrodes have the potential to boost the performance of polymeric solar devices,i ncluding photoelectrochemical devices, [12] photovoltaics, [13] sensors [14] and more. [15] Thesynthesis of the Y:ZnO@PCN core-shell photoanode is illustrated in Figure 1a.H ighly conductive 1D Y:ZnO NR arrays were achieved by the conventional hydrothermal approach, and PCN films were then coated on the charge collectors by in situ thermal vapor polymerization.…”

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confidence: 99%

Coating Polymeric Carbon Nitride Photoanodes on Conductive Y:ZnO Nanorod Arrays for Overall Water Splitting

Fang

et al. 2018

Angew Chem Int Ed

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121

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Polymeric carbon nitride (PCN) photosensitizers are proposed replacements for their inorganic counterparts in solar-to-fuel conversion via photoelectrochemical water splitting. However, intense charge recombination, primarily because of surface defects, limits the use of PCN in PEC systems. Now, photoanodes are designed by coating PCN films onto highly conductive yttrium-doped zinc oxide (Y:ZnO) nanorods (NRs) serving as charge collectors. The generation of charge carriers can therefore be promoted by this type II alignment. The charge collectors would be kept nearby for charge separation and transport to be used in the interfacial redox reactions. The photocurrent density of the polymer electrode is improved to 0.4 mA cm at 1.23 V vs. the reversible hydrogen electrode in a Na SO electrolyte solution under AM 1.5 illumination. The result reveals a more than 50-fold enhancement over the PCN films achieved by powder; the efficiency can be preserved at 95 % for 160 minutes.

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“…Therefore, the photoexcitation electron and hole can effectively migrate to the surface for water reduction and oxidation reactions, respectively. The conductive material is generally based on transparent conductive oxides (TCOs) for photo(electro)catalysis [16–18] . Their high conductivity and transparency also lead them to dominate the market for a variety of applications, including photovoltaics, photocatalytic devices, sensors, and others.…”

Section: Figurementioning

confidence: 99%

Coating Polymeric Carbon Nitride on Conductive Carbon Cloth to Promote Charge Separation for Photocatalytic Water Splitting

et al. 2021

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The use of polymeric carbon nitride (PCN) for photoredox catalysis is innovating and promoting toward sustainable energy economy. One of the drawbacks of this metal‐free photocatalyst is its insufficient charge separation and transfer. Herein, a metal‐free system was achieved by anchoring PCN on conductive carbon cloth (CCC). CCC in this system facilitated the charge separation and transport of the photoexcitation charges when PCN films were illuminated. Both photoelectrochemical water oxidation and photocatalytic overall water splitting were achieved, and the performances were improved two‐fold with respect to the powder PCN.

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An enhanced gas ionization sensor from Y-doped vertically aligned conductive ZnO nanorods

Cited by 36 publications

References 56 publications

ZnO Nanorods for Gas Sensors

ZnO Nanorods for Gas Sensors

Coating Polymeric Carbon Nitride Photoanodes on Conductive Y:ZnO Nanorod Arrays for Overall Water Splitting

Coating Polymeric Carbon Nitride on Conductive Carbon Cloth to Promote Charge Separation for Photocatalytic Water Splitting

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