A highly sensitive ultraviolet sensor based on a facile in situ solution-grown ZnO nanorod/graphene heterostructure

Chang, Haixin; Sun, Zhenhua; Ho, Keith Yat Fung; Tao, Xiaoming; Yan, Feng; Kwok, Wai Ming; Zheng, Zijian

doi:10.1039/c0nr00588f

Cited by 269 publications

(187 citation statements)

References 44 publications

(51 reference statements)

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“…It is reported that monolayer graphene film15 and reduced graphene oxide16 have been introduced to combine with ZnO nanostructures to enhance performance ZnO‐based photodetectors. But as to our knowledge, there is no reported research that reveals the function of GNDA in photodetector 16, 17. In order to explore the application potential of GNDA in photodetector, GNDA was combined with ZnO nanofilm to fabricate ZnO/GNDA hybrids UV photodetector, of which the performance were compared with ZnO photodetector ( Scheme 2 ).…”

Section: Introductionmentioning

confidence: 99%

Size‐Controlled Graphene Nanodot Arrays/ZnO Hybrids for High‐Performance UV Photodetectors

et al. 2017

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Graphene nanodots (GNDs) are one of the most attractive graphene nanostructures due to their tunable optoelectronic properties. Fabricated by polystyrene‐nanosphere lithography, uniformly sized graphene nanodots array (GNDA) is constructed as an ultraviolet photodetector (PD) with ZnO nanofilm spin coated on it. The size of GNDA can be well controlled from 45 to 20 nm varying the etching time. It is revealed in the study that the photoelectric properties of ZnO/GNDA PD are highly GNDA size‐dependent. The highest responsivity (R) and external quantum efficiency of ZnO/GNDA (20 nm) PD are 22.55 mA W−1 and 9.32%, almost twofold of that of ZnO PD. Both ZnO/GNDA (20 nm) PD and ZnO/GNDA (30 nm) PD exhibit much faster response speed under on/off switching light and have shorter rise/decay time compared with ZnO PD. However, as the size of GNDA increase to 45 nm, the PD appears poor performance. The size‐dependent phenomenon can be explained by the energy band alignments in ZnO/GNDA hybrids. These efforts reveal the enhancement of GNDs on traditional photodetectors with tunable optoelectronic properties and hold great potential to pave a new way to explore the various remarkable photodetection performances by controlling the size of the nanostructures.

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Section: Introductionmentioning

confidence: 99%

Size‐Controlled Graphene Nanodot Arrays/ZnO Hybrids for High‐Performance UV Photodetectors

et al. 2017

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“…ZnO is an efficient UV light emitter (Tang et al 1998;Park et al 2002) among all other available semiconductor materials. Ultraviolet lasing from ZnO NRs at room temperature, ZnO NRs based dye-sensitized solar cells, photodetectors have been demonstrated (Huang et al 2001;Baxter et al 2006;Ahn et al 2004;Alvi et al 2010;Chang et al 2011). Earlier, metal nanoparticles, ZnO nanocrystals and various complex oxide nanoparticles have been synthesized by mechanochemical technique (Tsuzuki and McCormick 2001;Ao et al 2006;Tsuzuki and McCormick 2004;Pullar et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Quick single-step mechanosynthesis of ZnO nanorods and their optical characterization: milling time dependence

Dhara

Giri

2011

Appl Nanosci

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We report on the growth of ZnO nanorods (NRs) by a quick single-step mechanochemical process and investigated the milling time dependence on the structural and optical properties of the ZnO NRs. Mechanochemical reactions are carried out in a planetary ball mill for the time durations ranging from 30 min to 5 h. XRD and TEM studies revealed wurtzite structure of the as-grown ZnO NRs with length of several hundreds of nanometers to few micrometers after 30 min of reaction. Average diameter of the as-grown ZnO NRs decreases from 40 to 15 nm with increasing reaction time. Micro-Raman spectra show redshift in the characteristic Raman modes, indicating presence of milling induced strain. As-grown NRs show blueshift in the excitonic absorption peak with increasing milling time due to decrease in size and induced strain. Room temperature photoluminescence (PL) spectra show strong band-edge related UV emission and other three major emission peaks, two in the UV-blue region and one at the visible region. Post-growth annealing of the asgrown ZnO NRs completely eliminates the defect related visible PL band. Low-temperature PL studies show an additional sharp peak related to donor-bound excitonic transition, revealing the n-type nature of the as-grown NRs.

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“…[1][2][3][4][5][6] Recently, due to surging demand for flexible displays and wearable mobile devices, fabrication of high-performance electronics on large-scale non-crystalline substrates has become increasingly important. For such applications, polycrystalline or amorphous ZnO thin films have typically been deposited on amorphous substrates.…”

mentioning

confidence: 99%

Growth and optical characteristics of high-quality ZnO thin films on graphene layers

et al. 2015

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We report the growth of high-quality, smooth, and flat ZnO thin films on graphene layers and their photoluminescence (PL) characteristics. For the growth of high-quality ZnO thin films on graphene layers, ZnO nanowalls were grown using metal-organic vapor-phase epitaxy on oxygen-plasma treated graphene layers as an intermediate layer. PL measurements were conducted at low temperatures to examine strong near-band-edge emission peaks. The full-width-at-half-maximum value of the dominant PL emission peak was as narrow as 4 meV at T = 11 K, comparable to that of the best-quality films reported previously. Furthermore, the stimulated emission of ZnO thin films on the graphene layers was observed at the low excitation energy of 180 kW/cm2 at room temperature. Their structural and optical characteristics were investigated using X-ray diffraction, transmission electron microscopy, and PL spectroscopy.

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A highly sensitive ultraviolet sensor based on a facile in situ solution-grown ZnO nanorod/graphene heterostructure

Cited by 269 publications

References 44 publications

Size‐Controlled Graphene Nanodot Arrays/ZnO Hybrids for High‐Performance UV Photodetectors

Size‐Controlled Graphene Nanodot Arrays/ZnO Hybrids for High‐Performance UV Photodetectors

Quick single-step mechanosynthesis of ZnO nanorods and their optical characterization: milling time dependence

Growth and optical characteristics of high-quality ZnO thin films on graphene layers

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