Enhanced glucose detection using enzyme-immobilized ZnO/ZnS core/sheath nanowires

Sung, Yun Mo; Noh, Kyung-Min; Kwak, Woo Chul; Kim, Tae Geun

doi:10.1016/j.snb.2011.10.061

Cited by 40 publications

(26 citation statements)

References 29 publications

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“…10s) for glucose detection due to direct electron transfer between the active sites of immobilized GOx and the electrode surface. A variety of other GOx-based glucose biosensors have also been reported using tetragonal pyramid-shaped porous ZnO nanostructures fabricated on a glassy carbon electrode (GCE) [88], ZnO nanorod/Au nanocrystal matrix [89], ZnO nanoclusters doped with Co [90], carbon-decorated ZnO NW array [91], and vertically grown ZnO NW coated with a monolayer of ZnS NCs [92]. …”

Section: Biosensors Based On Zno Nanomaterialsmentioning

confidence: 99%

Biomedical Applications of Zinc Oxide Nanomaterials

Zhang¹,

Nayak²,

Hong³

et al. 2013

CMM

563

302

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Nanotechnology has witnessed tremendous advancement over the last several decades. Zinc oxide (ZnO), which can exhibit a wide variety of nanostructures, possesses unique semiconducting, optical, and piezoelectric properties hence has been investigated for a wide variety of applications. One of the most important features of ZnO nanomaterials is low toxicity and biodegradability. Zn2+ is an indispensable trace element for adults (~10 mg of Zn2+ per day is recommended) and it is involved in various aspects of metabolism. Chemically, the surface of ZnO is rich in -OH groups, which can be readily functionalized by various surface decorating molecules. In this review article, we summarized the current status of the use of ZnO nanomaterials for biomedical applications, such as biomedical imaging (which includes fluorescence, magnetic resonance, positron emission tomography, as well as dual-modality imaging), drug delivery, gene delivery, and biosensing of a wide array of molecules of interest. Research in biomedical applications of ZnO nanomaterials will continue to flourish over the next decade, and much research effort will be needed to develop biocompatible/biodegradable ZnO nanoplatforms for potential clinical translation.

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Section: Biosensors Based On Zno Nanomaterialsmentioning

confidence: 99%

Biomedical Applications of Zinc Oxide Nanomaterials

Zhang¹,

Nayak²,

Hong³

et al. 2013

CMM

563

302

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show abstract

“…The energy positions of the conduction and valence bands of ZnS are higher than those of ZnO. 2,3 This means that holes and electrons generated by ZnS and ZnO in a PEC experiment can be collected mainly in the valence band of ZnS and the conduction band of ZnO, respectively.…”

Section: Introductionmentioning

confidence: 99%

The structural and the photoelectrochemical properties of ZnO–ZnS/ITO 1D hetero-junctions prepared by tandem electrodeposition and surface sulfidation: on the material processing limits

et al. 2018

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ZnO-ZnS 1D hetero-nanostructures were prepared by an easy and scalable processing route. It consists of ZnO nanorod electrodeposition on ITO substrate and surface sulfidation by ion exchange in an aqueous Na 2 S solution. Increasing the treatment contact time (t c ) from 8 to 48 h involves different ZnS growth mechanisms leading to different structural and microstructural rod characteristics, even if the overall size does not change significantly. Grazing X-ray diffraction, high-resolution microscopy, energy-dispersive spectrometry and X-ray photoelectron spectroscopy describe the outer surface layer as a poly-and nanocrystalline ZnS blende shell whose thickness and roughness increase with t c . The ZnO wurtzite-ZnS blende interface goes from continuous and dense, at short t c , to discontinuous and porous at long t c , indicating that ZnS formation proceeds in a more complex way than a simple S 2À /O 2À ion exchange over the treatment time. This feature has significant consequences for the photoelectrochemical performance of these materials when they are used as photoanodes in a typical light-assisted water splitting experiment. A photocurrent (J p ) fluctuation of 45% for less than 5 min of operation is observed for the sample prepared with a long sulfidation time while it does not exceed 15% for that obtained with a short one, underlining the importance of the material processing conditions on the preparation of valuable photoanodes.

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“…By surface functionalizing with glucose oxidase (GOx), a ZnO NW‐based glucose sensor with Schottky contact is fabricated. ZnO nanostructures, due to their biocompatibility, stability, and high isoelectric point,13–14 have been widely reported in application of glucose sensing 14–16. Furthermore, as a member of the wurzite structure family, ZnO has piezoelectric properties, making it a good candidate for studying the piezotronic effect on the glucose sensor.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Performance of a ZnO Nanowire‐Based Self‐Powered Glucose Sensor by Piezotronic Effect

Pan

Zhu

et al. 2013

Adv Funct Materials

180

124

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A self-powered, piezotronic effect-enhanced glucose sensor based on metalsemiconductor-metal (M-S-M) structured single ZnO nanowire device is demonstrated. A triboelectrical nanogenerator (TENG) is integrated to build a self-powered glucose monitoring system (GMS) to realize the continuously monitoring of glucose concentrations. The performance of the glucose sensor is generally enhanced by the piezotronic effect when applying a -0.79% compressive strain on the device, and magnitude of the output signal is increased by more than 200%; the sensing resolution and sensitivity of sensors are improved by more than 200% and 300%, respectively. A theoretical model using energy band diagram is proposed to explain the observed results. This work demonstrates a promising approach to raise the sensitivity, improve the sensing resolution, and generally enhance the performance of glucose sensors, also providing a possible way to build up a self-powered GMS.

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Enhanced glucose detection using enzyme-immobilized ZnO/ZnS core/sheath nanowires

Cited by 40 publications

References 29 publications

Biomedical Applications of Zinc Oxide Nanomaterials

Biomedical Applications of Zinc Oxide Nanomaterials

The structural and the photoelectrochemical properties of ZnO–ZnS/ITO 1D hetero-junctions prepared by tandem electrodeposition and surface sulfidation: on the material processing limits

Enhanced Performance of a ZnO Nanowire‐Based Self‐Powered Glucose Sensor by Piezotronic Effect

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