Hydrothermal growth of flower-like ZnO nanostructures on porous silicon substrate

Eswar, Kevin Alvin; Rouhi, Jalal; Husairi, F.S.; Dalvand, Ramazanali; Alrokayan, Salman A.; Khan, Haseeb A.; Mahmood, Mohamad Rusop; Abdullah, Saifollah

doi:10.1016/j.molstruc.2014.05.067

Cited by 44 publications

(26 citation statements)

References 21 publications

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“…During the experiment the following were used: acetylcholinesterase (acetylcholine hydrolase, EC 3.1.1.7, acetylcholinesterase from human erythrocytes), acetylthiocholine iodide, 5,5 -dithio-bis(2-nitrobenzoic acid), neostigmine methyl sulfate and MgCl 2 , purchased from Sigma-Aldrich, NaCl (Daejung Chemical and Metals Co., Ltd), ethanol, water (Samchun Chemicals), HF (48 %, w/w; Merck) and boron-doped p-type silicon wafers with a resistivity of [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] cm and thickness 500-550 μm (obtained from Cree Co.). The photoluminescence spectra and relative photoluminescence intensities were measured on an FS-2 fluorescence spectrometer (Scinco) and LabRam HR-800 spectrometer (Horiba Jobin Yvon) with a He/Cd laser source (325 nm).…”

Section: Materials and Instrumentationmentioning

confidence: 99%

“…The silicon wafer (boron-doped p-type silicon wafers with resistivity [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] cm and thickness 500-550 μm) was cut into chips sized 1×1 cm 2 and degreased with an ultrasonic bath of acetone for 5 min, and then rinsed in deionized water. After drying with nitrogen gas, silver paste was simply sputtered on to the back of the wafer to provide a back ohmic contact for anodization.…”

Section: Preparation Of Porous Silicon Surfacementioning

confidence: 99%

“…The unique features of porous silicon make this material a frontline candidate for enzyme immobilization [3][4][5][6][7][8][9], drug delivery [10,11], energyharvesting devices [12][13][14][15][16][17] and biosensing [18,19], due to its large internal surface area, prodigious pore volume, biodegradability, and tunable pore geometry via variation of both porosity and crystallite size [20][21][22][23][24]. The biodegradation of porous silicon results in the formation of orthosilicic acid, which can easily be absorbed from the gastrointestinal tract and excreted from the body [25].…”

Section: Introductionmentioning

confidence: 99%

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Acetylcholinesterase immobilization and characterization, and comparison of the activity of the porous silicon-immobilized enzyme with its free counterpart

et al. 2016

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SynopsisA successful prescription is presented for acetylcholinesterase physically adsorbed on to a mesoporous silicon surface, with a promising hydrolytic response towards acetylthiocholine iodide. The catalytic behaviour of the immobilized enzyme was assessed by spectrophotometric bioassay using neostigmine methyl sulfate as a standard acetycholinesterase inhibitor. The surface modification was studied through field emission SEM, Fourier transform IR spectroscopy, energy-dispersive X-ray spectroscopy, cathode luminescence and X-ray photoelectron spectroscopy analysis, photoluminescence measurement and spectrophotometric bioassay. The porous silicon-immobilized enzyme not only yielded greater enzyme stability, but also significantly improved the native photoluminescence at room temperature of the bare porous silicon architecture. The results indicated the promising catalytic behaviour of immobilized enzyme compared with that of its free counterpart, with a greater stability, and that it aided reusability and easy separation from the reaction mixture. The porous silicon-immobilized enzyme was found to retain 50 % of its activity, promising thermal stability up to 90 • C, reusability for up to three cycles, pH stability over a broad pH of 4-9 and a shelf-life of 44 days, with an optimal hydrolytic response towards acetylthiocholine iodide at variable drug concentrations. On the basis of these findings, it was believed that the porous silicon-immobilized enzyme could be exploited as a reusable biocatalyst and for screening of acetylcholinesterase inhibitors from crude plant extracts and synthesized organic compounds. Moreover, the immobilized enzyme could offer a great deal as a viable biocatalyst in bioprocessing for the chemical and pharmaceutical industries, and bioremediation to enhance productivity and robustness.

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Section: Materials and Instrumentationmentioning

confidence: 99%

Section: Preparation Of Porous Silicon Surfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Acetylcholinesterase immobilization and characterization, and comparison of the activity of the porous silicon-immobilized enzyme with its free counterpart

et al. 2016

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“…There are various structures of ZnO have been produced such as nanoparticles, nanorods, nanowires, nano-flower and honey-comb [3][4][5][6]. The structure are highly depends on the methods applied such as hydrothermal, RF sputtering, sol-gel synthesis and pulsed laser ablation [7]. Among them, hydrothermal is the most practical for cost-effective method.…”

Section: Introductionmentioning

confidence: 99%

Structural Studies of Zno Nanostructures on Porous Silicon: Effect of Post-Annealing Temperature

Eswar

Suhaimi

Guliling

et al. 2018

IJET

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ZnO Nanostructures have been successfully deposited on of Porous silicon (PSi) via wet colloid chemical approach. PSi was prepared by electrochemical etching method. ZnO/PSi thin films were annealed in different temperature in the range of 300 °C to 700 °C. Surface morphology studies were conducted using field emission scanning microscopy (FESEM). Flower-like structures of ZnO were clearly seen at annealing temperature of 500 °C. The X-ray diffraction spectra (XRD) have been used to investigate the structural properties. There are three dominant peaks referred to plane (100), (002) and (101) indicates that ZnO has a polycrystalline hexagonal wurtzite structures. Plane (002) shows the highest intensities at annealing temperature of 500 °C. Based on plane (002) analysis, the sizes were in range of 30.78 nm to 55.18. In addition, it was found that the texture coefficient of plane (002) is stable compared to plane (100) and (101).

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“…In addition, Kim et al have proposed that the photoluminescence (PL) properties of ZnO nanostructures grown on PSi can be applied to white light emitting devices [3]. Several methods have been used to produce ZnO nanostructures including radio frequency (RF) magnetron sputtering, pulsed laser deposition, chemical vapour deposition, atomic layer deposition, sol-gel deposition and hydrothermal immersion deposition [4][5][6][7][8][9][10]. Among them, hydrothermal immersion method was very popular due to simplicity, low cost and can be conducted in low-temperature.…”

Section: Introductionmentioning

confidence: 99%

Seeded Porous Silicon Preparation as a Substrate in the Growth of ZnO Nanostructures

Eswar

Lepit²,

Rasmidi³

et al. 2015

AMM

Self Cite

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In this work, seeded porous silicon (PSi) was used as a substrate in the growth of ZnO nanostructures. PSi was prepared by electrochemical etching method. ZnO thin films as seeded were deposited via sol-gel spin coating method. ZnO nanostructures were grown on seeded PSi using hydrothermal immersion method. In order to study the effect of post-heat treatment on the substrate, post annealing temperature were varied in the range of 300 to 700 °C. The FESEM results shows ZnO thin film composed of nanoparticles were distributed over the PSi surface. Based on AFM characterization, the smoothest surface was produced at post annealing temperature of 500 °C. There are two different peaks appeared in PL characterization. The peak in near-UV range is belonging to ZnO thin films while a broad peak in visible range can be attributed to ZnO defects and PSi surface. In addition, FESEM, XRD and PL were used to characterize the ZnO nanostructures. The FESEM results revealed ZnO nano-flower were successfully grown on seeded PSi. Hexagonal wurtzite of ZnO with dominated by the plane (100), (002), and (101) was found by XRD characterization. Two different peaks in UV range and visible range can be attributed to ZnO nano-flower and various defects of ZnO, respectively.

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Hydrothermal growth of flower-like ZnO nanostructures on porous silicon substrate

Cited by 44 publications

References 21 publications

Acetylcholinesterase immobilization and characterization, and comparison of the activity of the porous silicon-immobilized enzyme with its free counterpart

Acetylcholinesterase immobilization and characterization, and comparison of the activity of the porous silicon-immobilized enzyme with its free counterpart

Structural Studies of Zno Nanostructures on Porous Silicon: Effect of Post-Annealing Temperature

Seeded Porous Silicon Preparation as a Substrate in the Growth of ZnO Nanostructures

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