CO2 detection with CNx thin films deposited on porous silicon

Zouadi, N.; Messaci, S.; Sam, S.; Bradai, Djamel; Gabouze, N.

doi:10.1016/j.mssp.2014.07.023

Cited by 15 publications

(5 citation statements)

References 35 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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“…15) Carbon nitride is also studied as humidity sensors 16) and CO 2 sensors. 17) According to these reports, the adsorbed molecules can change mainly C-H bonds. On the other hand, we have prepared hydrogen-free a-CN x films by sputtering a graphite target in N 2 gas atmosphere and studied the resistivity change following the adsorption of N 2 .…”

Section: Introductionmentioning

confidence: 99%

Electrical resistivity response of amorphous carbon nitride thin films in various gas atmospheres

Tamura¹,

Aono²,

Abe³

et al. 2015

Jpn. J. Appl. Phys.

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Electrical behaviors of amorphous carbon nitride (a-CNx) films following exposure to various gas species were investigated. The a-CNx film was prepared by reactive RF magnetron sputtering at 873 K. The resistivity of the film was measured in flowing He, N2, O2, Ar, and CO2. Regardless of gas species, the electrical resistivity of the a-CNx film dropped rapidly following gas injection and recovered in the evacuation process. This phenomenon is closely related to the changes in the film microstructure and electrical state. The response time in the adsorption process decreased with increasing gas pressure. The variation range of the electrical resistivity changed depending on the gas species.

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“…In many workplaces recommendations are there, for indoor carbon dioxide concentrations not exceeding 1000-3000 ppm and consequently the development of CO 2 sensor is of outmost importance today [24][25][26]. In this present work, in order to improve the CO 2 sensing property of CdO nanostructure, CdO has been doped with tin (Sn).…”

Section: Introductionmentioning

confidence: 99%