Nitrogen-doped graphene quantum dot decorated ultra-thin ZnO nanosheets for NO2 sensing at low temperatures

Zhang, Yonghui; Wang, Chao-Nan; Yue, Lijuan; Chen, Junli; Gong, Feilong; Fang, Shaoming

doi:10.1016/j.physe.2021.114807

Cited by 19 publications

(12 citation statements)

References 53 publications

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“…More specifically, a combination of both materials enables designing high-performance sensors for the detection of different substances including H 2 O 2 , 3 CO 2 , 4 ammonia, 5 ethanol, 6 hydroquinone, 7 zearalenone in mildewing cereal crops, 8 acetone, 9,10 H 2 S, 11 acetic acid, 12 chemo-therapeutic agent (6-mercaptopurine), 13 and NO 2 . 14,15 Apart from various sensing principles that have been applied for quantification of gas or liquid molecules, it should be emphasized that in most cases sensitive hybrid materials were constructed through functionalization or decoration of host ZnO matrix with undoped or doped GQDs. 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.…”

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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“…Bottom-up Pyrolysis GQDs Citric acid heated at 200 • C for 30 min [69,84,86] Hydrothermal synthesis GQDs Citric acid hydrothermal treatment, 180 • C, 5 h [110,111] N-GQDs Citric acid + urea hydrothermal treatment, 160 • C, 4 h [112][113][114][115] Citric acid + urea hydrothermal treatment, 180 • C, 8 h [116,117] Citric acid + dopamine hydrochloride hydrothermal treatment, 180 (2) ZnO/GQDs: GQDs dropped onto ZnO p-n heterojunction NH 3 [106] 10 GQDs/ZnO…”

Section: Gqdsmentioning

confidence: 99%

“…Chu et al [110,111] synthesized GQDs through onestep hydrothermal treatment with citric acid. Using urea [112][113][114][115][116][117] and dopamine hydrochloride [118] as N source, thiourea as S and N source [67,120] respectively, N-doped GQDs (N-GQDs), and S, N co-doped GQDs (S, N-GQDs) were obtained in the presence Precursor molecules treated by hydrothermal methods had been demonstrated to be another effective method for producing GQDs, indicating that heteroatoms were easily doped during the synthesis process. Chu et al [110,111] synthesized GQDs through one-step hydrothermal treatment with citric acid.…”

Section: Bottom-up Approachesmentioning

confidence: 99%

“…Chu et al [110,111] synthesized GQDs through one-step hydrothermal treatment with citric acid. Using urea [112][113][114][115][116][117] and dopamine hydrochloride [118] as N source, thiourea as S and N source [67,120] respectively, N-doped GQDs (N-GQDs), and S, N co-doped GQDs (S, N-GQDs) were obtained in the presence of CA (Figure 3b-d). In our group, cobalt (Co) and N co-doped GQDs [119] had been successfully prepared by using CA, urea, and CoCl 2 •6H 2 O as precursors (Figure 3e).…”

Section: Bottom-up Approachesmentioning

confidence: 99%

“…GQDs/ZnO composites with different GQDs contents were synthesized using a hydrothermal method, which demonstrated that the content of GQDs in the composite had a major impact on the gas-sensitive response and selectivity of acetic acid gas [110] and NO 2 (Figure 4c) [114]. GQDs were successfully modified onto ZnO surface to form heterojunctions, which showed an improved ammonia sensing at room temperature [106].…”

Section: Synthesis Ofmentioning

confidence: 99%

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Graphene quantum dots (GQDs), as 0D graphene nanomaterials, have aroused increasing interest in chemiresistive gas sensors owing to their remarkable physicochemical properties and tunable electronic structures. Research on GQDs has been booming over the past decades, and a number of excellent review articles have been provided on various other sensing principles of GQDs, such as fluorescence-based ion-sensing, bio-sensing, bio-imaging, and electrochemical, photoelectrochemical, and electrochemiluminescence sensing, and therapeutic, energy and catalysis applications. However, so far, there is no single review article on the application of GQDs in the field of chemiresistive gas sensing. This is our primary inspiration for writing this review, with a focus on the chemiresistive gas sensors reported using GQD-based composites. In this review, the various synthesized strategies of GQDs and its composites, gas sensing enhancement mechanisms, and the resulting sensing characteristics are presented. Finally, the current challenges and future prospects of GQDs in the abovementioned application filed have been discussed for the more rational design of advanced GQDs-based gas-sensing materials and innovative gas sensors with novel functionalities.

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et al. 2024

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Hybrid nanocomposites integrating nanostructured zinc oxide (ZnO) and carbon quantum dots (CQDs) with designed heterostructures possess exceptional optical and electronic properties. These properties hold immense potential for advancements across diverse scientific and technological fields. This review article investigates the synthesis, properties, and applications of ZnO‐CQD heterostructure nanocomposites. Recent breakthroughs in fabrication methods are examined, including hydrothermal, microwave‐assisted, and eco‐friendly techniques. Key preparation methods such as sol‐gel, co‐precipitation, and electrochemical deposition are discussed, emphasizing their role in controlling heterostructure formation. This review analyses the impact of heterostructures on optical and electronic properties, such as fluorescence, photoluminescence, and photocatalytic activity. Synergistic interactions between ZnO and CQDs within heterostructures are highlighted, demonstrating how they lead to substantial performance improvements. Applications of ZnO‐CQD heterostructures span solar cells, LEDs, photodetectors, water purification, antimicrobial treatments, gas sensing, catalysis, biomedical imaging, drug delivery, environmental sensing, and energy storage. Insights are provided into refining synthesis methods, enhancing characterisation techniques, and broadening the application landscape. Challenges like stability are addressed, along with strategies for optimised performance and practical implementation.

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Nitrogen-doped graphene quantum dot decorated ultra-thin ZnO nanosheets for NO2 sensing at low temperatures

Cited by 19 publications

References 53 publications

Nature of photoexcited states in ZnO-embedded graphene quantum dots

Nature of photoexcited states in ZnO-embedded graphene quantum dots

Recent Advances of Graphene Quantum Dots in Chemiresistive Gas Sensors

Nanostructured ZnO‐CQD Hybrid Heterostructure Nanocomposites: Synergistic Engineering for Sustainable Design, Functional Properties, and High‐Performance Applications

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