Fast response ZnO/PVA nanocomposite-based photodiodes modified by graphene quantum dots

Mousavi, Seyedeh Soraya; Sajad, Batool; Majlesara, M. H.

doi:10.1016/j.matdes.2018.11.037

Cited by 60 publications

(16 citation statements)

References 34 publications

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“…Another example of a beneficial synergy between GQDs and ZnO features concerns a high promise of related nanohybrids for design of next-generation ultraviolet (UV) photodetectors. [16][17][18][19][20][21][22][23][24][25][26][27][28][29] On one hand, the presence of GQDs may favor separation and transport of the photogenerated carriers, thus reducing both the electron-hole recombination and the photoresponse time. Since GQDs have a good response to UV light, sensitization with GQDs may, on the other hand, enhance the overall UV absorption in ZnO and hence the photoconductivity of ZnO-based photodetector.…”

Section: Introductionmentioning

confidence: 99%

Nature of photoexcited states in ZnO-embedded graphene quantum dots

Shtepliuk

Yakimova

2023

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 99%

Nature of photoexcited states in ZnO-embedded graphene quantum dots

Shtepliuk

Yakimova

2023

Phys. Chem. Chem. Phys.

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“…Since the discovery of ZnO and its usefulness in varieties of applications, it has attracted increasing attention as promising semiconducting material [1][2][3][4][5]. Apart from gas sensing, ZnO has attracted high technological applications, like photodetectors, photodiodes, surface acoustic wave filters, solar cells, photonic crystals, LEDs, optical waveguides, due to its wide direct band gap (3.3 eV) and large excitation binding energy (60 meV) [6][7][8][9][10][11][12]. In the state of the art, doping of noble metals like gold (Au), platinum (Pt), ruthenium (Ru), nickel (Ni), palladium (Pd), gallium (Ga), silver (Ag) and their combinations showed significant improvement in ZnO-based gas sensor [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Development of Ag/ZnO nanorods and nanoplates at low hydrothermal temperature and time for acetone sensing application: an insight into spillover mechanism

et al. 2019

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Nanostructure synthesis at low temperature with high purity and yield has a great potential in the present competitive research and development of nanomaterials for varieties of application. Here, we demonstrate the facile hydrothermal synthesis of ZnO nanocomposites at low hydrothermal temperature and time. With barely 80 °C hydrothermal temperature and 2 h of reaction time, ZnO nanorods were successfully synthesized, while by slightly increasing the reaction time (6 h-and-on), nanoplates of the same material were developed. Both the obtained nanostructures were analyzed using physio-chemical characterizing tools and examined for practical relevance as gas sensing material. The optimized sample was further treated to Ag loading (1-5 mol%) for lowering the operating temperature of the sensor. ZnO sample with 3 mol% Ag loading showed excellent sensitivity of 92.7% for 1000 ppm of acetone concentration with a drop in the operating temperature from 325 °C (Pristine ZnO) to 250 °C (Ag-loaded ZnO). The morphological correlation with reaction time and thereby sensitivity and spillover mechanism are discussed. Graphic abstractKeywords Composite materials · Hydrothermal process · Ag/ZnO · Sensors · Acetone However, in the present industrial scenario, chemical synthesis of these nanomaterials is facing enormous challenges in terms of trimming the overall process span and production at low temperature. Though hydrothermal synthesis route offers decent advantages over conventional synthesis routes, its high reaction temperature (hence high pressure) and longer reaction time are the major concerns at pilot/industrial-scale production. However, by effective tuning of reaction temperature in combination with the reaction time, one can get the same nanomaterial in the desired morphology. Here, the problem addressed in the paper is to ease the high temperature and time-consuming process for synthesizing ZnO-based nanostructures. The efforts were made to custom tailor the ZnO nanostructures at lower hydrothermal temperature (80 °C) and shorter reaction time (2-10 h). With barely 80 °C hydrothermal temperature and 2 h of reaction time, ZnO nanorods were successfully synthesized, while by slightly increasing the reaction time (6 h-and-on), nanoplates of the same material were developed. The obtained nanostructures are Compliance with ethical standardsConflict of interest The authors declare that there is no competing interest whatsoever.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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“…Interfacial interactions between the ller and the matrix improve dielectric, optical and electrical properties of composites. 8 Metal NPs (Cu, Ag, Co.), oxides (CuO, ZnO. ), graphene are incorporated into PVA polymer forming nanocomposites for nanophotonic, biomedical and optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%