Electrochemical Method for Analysis of Cholesterol Based on In Situ Synthesized Graphene Decorated with Zinc Oxide Nanoparticles

Watanabe, Elli; Spidle, Ryan T.; Caudle, Steven; Manani, Geoffrey; Wanekaya, Adam K.

doi:10.1149/2.001401ssl

Cited by 11 publications

(5 citation statements)

References 2 publications

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“…The hybridization of graphene and the TMDs with colloidal QDs can be achieved via assembly [19] or in situ methods [20]. The layer-by-layer (LbL) assembly method is most commonly used and relies on the electrostatic interaction of oppositely charged films [19].…”

Section: Fabrication Technologiesmentioning

confidence: 99%

High-response hybrid quantum dots- 2D conductor phototransistors: recent progress and perspectives

et al. 2017

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Abstract:Having been inspired by the tremendous progress in material nanoscience and device nanoengineering, hybrid phototransistors combine solution processed colloidal semiconductor quantum dots (QDs) with graphene or two-dimensional (2D) semiconductor materials. Novel detectors demonstrate ultrahigh photoconductive gain, high and selective photoresponse, low noise, and very high responsivity in visible-and near-infrared ranges. The outstanding performance of phototransistors is primarily due to the strong, selective, and size tunable absorption of QDs and fast charge transfer in 2D high mobility conductors. However, the relatively small mobility of QD nanomaterials was a technological barrier, which limited the operating rate of devices. Very recent innovations in detector design and significant progress in QD ligand engineering provide effective tools for further qualitative improvements. This article reviews the recent progress in material science, nanophysics, and device engineering related to hybrid phototransistors. Detectors based on various QD nanomaterials and several 2D conductors are compared, and advantages and disadvantages of various nanomaterials for applications in hybrid phototransistors are identified. We also benchmark the experimental characteristics with model results that establish interrelations and tradeoffs between detector characteristics, such as responsivity, dark and noise currents, the photocarrier lifetime, response, and noise bandwidths. We have shown that the most recent phototransistors demonstrate performance limited by the fundamental generation recombination noise in high gain devices. Interrelation between the dynamic range of the detector and the detector sensitivity is discussed. The review is concluded with a brief discussion of the remaining challenges and possible significant improvements in the performance of hybrid phototransistors.

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Section: Fabrication Technologiesmentioning

confidence: 99%

High-response hybrid quantum dots- 2D conductor phototransistors: recent progress and perspectives

et al. 2017

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“…GO shows only one predominant diffraction peak at ∼11.9° corresponding to the (001) reflection plane [22]. However, the diffraction peak of GO disappears in the spectrum of graphene/ZnO composite, and a weak diffraction peak centred at 2 θ = 25.02° appears which is corresponding to the graphene with crystal spacing of d 002 = 3.36 Å [23]. The weak peak of graphene in composite might be attributed to the factors that the strong diffraction peaks of ZnO cover up the weak peaks of graphene [24], or the content of the graphene is low and graphene is very thin which can only produce a particularly low diffraction peak [22, 25].…”

Section: Resultsmentioning

confidence: 99%

Enhancement of photocatalytic activity for fold‐like ZnO via hybridisation with graphene

Kong

Pan

2018

Micro & Nano Letters

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Fold-like ZnO nanoparticles were prepared by hydrothermal method, and followed by hybridisation with graphene to form graphene/ZnO composite. Photocatalytic properties of prepared samples were investigated by degrading methylene blue solution. It was found that the photocatalytic activity of ZnO has been much enhanced by hybridisation with graphene under either ultraviolet or visible irradiation. After four recycles of photocatalytic experiments, graphene/ZnO photocatalyst has not exhibited any great loss in photocatalytic activity. According to the photo-electrochemical experimental results, the possible mechanism of the enhanced photocatalytic activity could be attributed to the increased adsorption ability, the effective separation of electron-hole pairs and the excellent electron transport characteristics of graphene. Thus, this new and highly effective graphene/ZnO composite could be a perfect candidate in the field of photocatalysis, which provides a new idea for the construction of other photocatalysts based on graphene and semiconductor.

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“…As cholesterol has been linked to damaged arteries and leads to cardiovascular disease, ZnO nanoparticles were used as biosensors to detect cholesterol. It may be clearly inferred from previous findings in cholesterol sensing [30,67,68,69] that ZnO nanoparticles can be used as a hybrid material with other nanomaterials and electrodes.…”

Section: Biosensors With Different Zno Morphologiesmentioning

confidence: 97%

Electrochemical-Based Biosensors on Different Zinc Oxide Nanostructures: A Review

et al. 2019

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Electrochemical biosensors have shown great potential in the medical diagnosis field. The performance of electrochemical biosensors depends on the sensing materials used. ZnO nanostructures play important roles as the active sites where biological events occur, subsequently defining the sensitivity and stability of the device. ZnO nanostructures have been synthesized into four different dimensional formations, which are zero dimensional (nanoparticles and quantum dots), one dimensional (nanorods, nanotubes, nanofibers, and nanowires), two dimensional (nanosheets, nanoflakes, nanodiscs, and nanowalls) and three dimensional (hollow spheres and nanoflowers). The zero-dimensional nanostructures could be utilized for creating more active sites with a larger surface area. Meanwhile, one-dimensional nanostructures provide a direct and stable pathway for rapid electron transport. Two-dimensional nanostructures possess a unique polar surface for enhancing the immobilization process. Finally, three-dimensional nanostructures create extra surface area because of their geometric volume. The sensing performance of each of these morphologies toward the bio-analyte level makes ZnO nanostructures a suitable candidate to be applied as active sites in electrochemical biosensors for medical diagnostic purposes. This review highlights recent advances in various dimensions of ZnO nanostructures towards electrochemical biosensor applications.

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Electrochemical Method for Analysis of Cholesterol Based on In Situ Synthesized Graphene Decorated with Zinc Oxide Nanoparticles

Cited by 11 publications

References 2 publications

High-response hybrid quantum dots- 2D conductor phototransistors: recent progress and perspectives

High-response hybrid quantum dots- 2D conductor phototransistors: recent progress and perspectives

Enhancement of photocatalytic activity for fold‐like ZnO via hybridisation with graphene

Electrochemical-Based Biosensors on Different Zinc Oxide Nanostructures: A Review

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