Preparation and properties of ZnO loaded with uniform Ag nanoparticles

Zhang, Yunyan; Xu, Jian; Wang, Qiuling; Pan, Zhenzhu; Ma, Shiyu; Chen, Qiming

doi:10.1016/j.materresbull.2015.08.019

Cited by 17 publications

(6 citation statements)

References 24 publications

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“…The photocurrents were obtained by changing the source-drain voltages from −0.5 to 0.5 V. Both of the I−V curves of ZnO/(Cu:ZnO)-based photodetectors under those photon wavelengths exhibit linear I−V relations almost symmetrically under both forward and reverse bias, and that implies a good Ohmic contact behavior at the ZnO/ (Cu:ZnO) NRs/silver electrode junctions. 44,45 In addition, it is apparent that the photocurrent of the device increased as the light intensity increased, confirming our device's high responsiveness.…”

Section: ■ Introductionsupporting

confidence: 80%

Enhancing the Performance of ZnO-Based Photodetectors by Forming ZnO/(Cu:ZnO) Core/Shell Nanorods

Huynh,

Nguyen,

Dinh

et al. 2024

ACS Appl. Electron. Mater.

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ZnO nanomaterials are some of the most excellent candidates for low-cost but high-performance photodetectors, particularly in the UV region. Besides doping, architecting ZnO nanomaterials to extend their application is still attractive for developing low-cost optoelectronic devices. Thereby, this study introduces the innovation of ZnO nanorod-based photodetectors by combining two techniques, which are Cu doping and core/shell structuring. Particularly, the active material (ZnO/(Cu-doped ZnO) core/shell nanorods) was synthesized by a low-cost and easy fabrication process. Our device using the developed core/shell nanorods exhibits the maximum responsivity of ca. 4.5 mA W −1 at 395 nm light exposure, which is nearly 180% higher than that of a device based on Cu-doped ZnO NRs (formed with only the Cu-doping technique). This enhancement responsivity is attributed to the improved charge transport at the interface of the core/shell ZnO/(Cu-doped ZnO) NRs, which pertains to a process that reduces the electron−hole recombination probability, resulting in an improvement in the efficiency of the photodetectors. These outcomes reveal the essential role of core−shell structuring in improving the efficiency of ZnO-based photodetectors. In general, our study of ZnO/(Cu-doped ZnO) core/shell nanorods opens a potential approach for developing better photodetectors.

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Section: ■ Introductionsupporting

confidence: 80%

Enhancing the Performance of ZnO-Based Photodetectors by Forming ZnO/(Cu:ZnO) Core/Shell Nanorods

Huynh,

Nguyen,

Dinh

et al. 2024

ACS Appl. Electron. Mater.

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“…I-V characteristics of ZnO NRs/Ag NPs photodetector are shown in figure 3(a). Apparently, in both the dark and light conditions, the device illustrates the linear and symmetric I-V relations under the applied bias, which demonstrates a good Ohmic contact [26,27]. Besides, figure 3(b) shows timedepended photocurrent (I-t) curves of ZnO NRs and ZnO NRs/Ag NPs photodetectors, which provide a deep insight into the photodetector operation.…”

Section: Characteristics Of Zno Nrs/ag Nps Photodetectormentioning

confidence: 85%

Synthesis of ZnO nanorods decorating with Ag nanoparticles on flexible polyimide substrate for visible photodetector application

Nguyen,

Huynh,

Nguyen

et al. 2024

Adv. Nat. Sci: Nanosci. Nanotechnol.

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Polyimide (PI), which have many remarkable features such as excellent mechanical strength, outstanding thermal stability, exceptional electric properties, etc, is a potential carrier for optoelectronic devices due to its abundant applications. However, because of chemical inertness and smooth surface that led to the growth of materials on this substrate being more complex than that on rigid substrate, thus, this report aims to emphasise the synthesis of ZnO NRs decorated with the Ag NPs on flexible substrate for photodetector application. In this study, we successfully synthesise ZnO NRs/Ag NPs on a flexible PI substrate by the hydrothermal method. The performance of our photodetector in visible region (395 nm) exhibits via the responsivity of the device, which recorded value of ca. 40.16 mA W−1 at 1.66 mW cm−2. With obtained results, our research can pave the way for future studies based on flexible optoelectronic devices.

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“…A correlation between above electronic parameters and UV sensitivity of the ZnO and Ag/ZnO nanostructures have been confirmed [5,8]. Note, that the existence of the Schottky barriers in the ZnO grain boundary regions was not taken into account by the authors, who investigated UV sensors [9,11,20] or photocatalysts [12,[15][16][17][18] based on the nanocrystalline ZnO material. So, in this paper we present the results of studies that prove an important role of the symmetrical double Schottky barriers in the ZnO grain boundary regions in increasing of the photosensitivity of such objects.…”

Section: Introductionmentioning

confidence: 84%

“…According to [5], the pulsed electrodeposition ensures the best-controlled growth of ZnO nanostructured arrays with an antireflection effect and pronounced reversible hydrophobichydrophilic behavior, which can be managed by the ultraviolet irradiation. A combination of two promising nanomaterials, ZnO and silver (Ag), in fabricating of different Ag/ZnO heterostructure composites have been proposed recently in [5,[8][9][10][11][12] for the development of multifunctional nanosensors, including UV photosensors. In accordance with [5,8,13,14], the most hopeful approach for the increasing the sensitivity of ZnO nanostructures is the creation of Ag/ZnO nanocomposites by the deposition of silver nanoparticles on the zinc oxide surface.…”

Section: Introductionmentioning

confidence: 99%

“…Namely, due to adsorbed oxygen species (O2 − , O2 − , O − ), which are influenced by the near-surface and surface defects, that can act as charge carriers traps as well as adsorption sites. Similar to described in [7,20] for single-crystal ZnO nanostructures, the above mechanism of the UV photosensitivity is commonly used [9,15] for polycrystalline ZnO material, excluding an influence of the ZnO grain boundaries. However, the investigation of effect of the ZnO grain sizes on the UV sensitivity of the nanostructured ZnO arrays fabricated via pulsed electrodeposition and coated with Ag nanoparticles have approved unambiguously [5,8] the existence of symmetrical double Schottky barriers , which occur in the ZnO grain boundary regions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nanostructured ZnO Arrays Fabricated via Pulsed Electrodeposition and Coated with Ag Nanoparticles for Ultraviolet Photosensors

Klochko¹,

Klepikova²,

Petrushenko³

et al. 2018

J. Nano- Electron. Phys.

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Nanostructured one-dimensional (1-D) ZnO arrays fabricated via pulsed electrodeposition and coated with Ag nanoparticles are researched with the aim of their using in the ultraviolet (UV) photosensors. The results of the crystal structure investigations showed that the pulsed electrodeposited zinc oxide arrays are polycrystalline in nature and matching with hexagonal wurtzite modification of ZnO. To enhance its UV photosensitivity, the silver nanoparticles (AgNPs) with different shape and an average size of 60 nm, as well as 300-500 nm long Ag nanorods with ~30 nm diameter, are precipitated mainly on the (002), (101) and (100) ZnO planes. Study of electrical properties and electronic parameters of the 1-D ZnO and Ag/ZnO nanocomposites using a current-voltage and capacity-voltage characteristics identified the important role of the high double Schottky barriers at the ZnO intergrain boundaries for the creation of great UV photosensitivity. It is proved that through monitoring the amount of AgNPs on the ZnO surface the electrical properties and electronic parameters of the Ag/ZnO nanocomposites, and consequently, the output parameters of the UV photosensors can be controlled.

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Preparation and properties of ZnO loaded with uniform Ag nanoparticles

Cited by 17 publications

References 24 publications

Enhancing the Performance of ZnO-Based Photodetectors by Forming ZnO/(Cu:ZnO) Core/Shell Nanorods

Enhancing the Performance of ZnO-Based Photodetectors by Forming ZnO/(Cu:ZnO) Core/Shell Nanorods

Synthesis of ZnO nanorods decorating with Ag nanoparticles on flexible polyimide substrate for visible photodetector application

Nanostructured ZnO Arrays Fabricated via Pulsed Electrodeposition and Coated with Ag Nanoparticles for Ultraviolet Photosensors

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