Influence of stress in ZnO thin films on its biosensing application

Saha, Shibu; Tomar, Monika; Gupta, Vinay

doi:10.1016/j.enzmictec.2015.07.008

Cited by 9 publications

(3 citation statements)

References 25 publications

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“…Few biosensors have been developed using ZnO films. For example, Saha et al [23,24] deposited ZnO by means of the sputtering system on ITO substrate on which he fixed GOx to detect glucose concentrations, an increment in the sensitivity from 1.02 to 1.27 μAcm -2 mM -1 of the biosensor is reported when the working pressure increases from 20 to 50 mTorr; in the other hand they reported that the electrodes based on ZnO thin films, which are under the influence of higher stress, show better sensitivity. However, these biosensors are dependent on the use of an enzyme.…”

Section: Introductionmentioning

confidence: 99%

ZnO thin film as non-enzymatic glucose sensor in an alkaline solution

Villasana-Ponce

Chalé-Lara

Villamizar

et al. 2019

Superficies y Vacio

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In this work, ZnO films were deposited on titanium substrates by the sputtering technique for non-enzymatic glucose detection in an alkaline solution. The samples were grown using pulsed D.C. sputtering using a ZnO target; we remain constant the power at 100 W and varied the deposition time in order of obtain films with different thickness. The properties of the samples were analyzed by X-ray diffraction (XRD), optical transmission, scanning electron microscopy (SEM), and electrochemical techniques. The results shown that the thickness of the samples varied with the deposition time. The electrochemical response studied by cyclic voltammetry revealed that the sensor response increased when the ZnO film thickness decreased. The electrochemical biosensing device showed a sensitivity of 7.65 ?A cm-2mM-1 with a linear response range of 3.3 mM to 11.0 mM.

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Section: Introductionmentioning

confidence: 99%

ZnO thin film as non-enzymatic glucose sensor in an alkaline solution

Villasana-Ponce

Chalé-Lara

Villamizar

et al. 2019

Superficies y Vacio

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“…As high aspect ratio leads to higher enzyme loading which holds key to improved biosensor performance. In literature rf-sputtered ZnO thin films have been reported where sensitivity was obtained around 0.5-1.3 mA-cm -2 -M -1 [19]. Unlike this, ZnO nanostructures have been found to have improved sensitivities around 12-15 mA-cm -2 -M -1 [20].…”

Section: Introductionmentioning

confidence: 99%

Effect of immobilization technique on performance ZnO nanorods based enzymatic electrochemical glucose biosensor

Shukla¹,

Pramila²,

Palani³

et al. 2017

J. Phys.: Conf. Ser.

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Abstract:In this paper, ZnO Nanorods (ZNR) have been synthesized over Platinum (Pt) coated glass substrate with in-situ addition KMnO 4 during hydrothermal growth process. Significant variation in ZnO nanostructures was observed by KMnO 4 addition during the growth. Glucose oxidase was later immobilized over ZNRs. The asprepared ZNRs were further utilized for glucose detection by employing amperometric electrochemical transduction method. In order to optimize the performance of the prepared biosensor two different immobilization techniques i.e. physical adsorption and cross linking have been employed and compared. Further investigations suggest that immobilization via cross linking method resulted in the improvement of the biosensor performance, thereby significantly affecting the sensitivity and linear range of the fabricated biosensor. Among the two types of biosensors fabricated using ZNR, the best performance was shown by cross linked electrodes. The sensitivity for the same was found to be 17.7 mA-cm -2 -M -1 , along with a wide linear range of 0.5-8.5 mM.

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“…They are usually prepared on glass substrates for opto-electrical devices because of its low resistivity, high optical transparency, good optical gap energy, as well as excellent adhesion to substrates and chemical stability. Due to the excellent structural and optical properties of doped films, ZnO has been used in a wide variety of applications such as transparent electrodes, ferromagnetism, semiconductors, piezoelectric, optoelectronic, solar cells, spintronics and nanodevices [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. ZnO is one of the most important binary II-VI semiconductor compounds is a natural n-type electrical conductor with a direct energy wide band gap of 3.37 eV at room temperature, a large exciton binding energy (60 meV) [17,18].…”

Section: Introductionmentioning

confidence: 99%

The calculation of the optical gap energy of ZnXO (X = Bi, Sn and Fe)

Benramache

Benhaoua

2016

Open Physics

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Abstract:In this paper, a new mathematical model has been developed to calculate the optical properties of nanomaterials a function of their size and structure. ZnO has good characterizatics in optical, electrical, and structural crystallisation; We will demonstrate that the direct optical gap energy of ZnO films grown by US and SP spray deposition can be calculated by investigating the correlation between solution molarity, doping levels of doped films and their Urbache energy. A simulation model has been developed to calculate the optical band gap energy of undoped and Bi, Sn and Fe doped ZnO thin films. The measurements by thus proposed models are in agreement with experimental data, with high correlation coefficients in the range 0.94-0.99. The maximum calculated enhancement of the optical gap energy of Sn doped ZnO thin films is always higher than the enhancement attainable with an Fe doped film, where the minimum error was found for Bi and Sn doped ZnO thin films to be 2,345 and 3,072%, respectively. The decrease in the relative errors from undoped to doped films can be explained by the good optical properties which can be observed in the fewer number of defects as well as less disorder.

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Influence of stress in ZnO thin films on its biosensing application

Cited by 9 publications

References 25 publications

ZnO thin film as non-enzymatic glucose sensor in an alkaline solution

ZnO thin film as non-enzymatic glucose sensor in an alkaline solution

Effect of immobilization technique on performance ZnO nanorods based enzymatic electrochemical glucose biosensor

The calculation of the optical gap energy of ZnXO (X = Bi, Sn and Fe)

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