Thermal conductivity of partially amorphous porous silicon by photoacoustic technique

Isaiev, Mykola; Newby, Pascal; Canut, B.; Tytarenko, Alona; Lishchuk, Pavlo; Andrusenko, D. A.; Gomès, Séverine; Bluet, Jean‐Marie; Fréchette, Luc; Lysenko, V.; Burbelo, R. M.

doi:10.1016/j.matlet.2014.04.105

Cited by 20 publications

(21 citation statements)

References 15 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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“…(1 − P) 3 λ Si Drost et al 1995Gesele et al 1997Benedetto et al 1997Boarino et al 1999Lysenko et al 1999Amato et al 2000Périchon et al 2000Bernini et al 2001Bernini et al 2005Lettieri et al 2005Kihara et al 2005Gomès et al 2007Fang et al 2008De Boor et al 2011Amin-Chalhoub et al 2011Siegert et al 2012Newby et al 2013Valalaki and Nassiopoulou 2013Isaiev et al 2014Lucklum et al 2014Andrusenko et al 2014 FIGURE 9.1 Experimental data from the literature for thermal conductivity as a function of porosity, for as-anodized nano-and meso-porous silicon. Full symbols correspond to mesoporous silicon, and hollow symbols to nanoporous Si.…”

Section: Overview Of Thermal Conductivity Measurementsmentioning

confidence: 99%

Structural and Electrophysical Properties of Porous Silicon

2016

Porous Silicon: From Formation to Application: Formation and Properties, Volume One

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“…The cross-sectional SEM images of samples 1 and 2 are shown, for example, in Fig. 1.http://arxiv.org/abs/1809.09692Investigation of thermal transport properties was performed by applying the PA technique in classical configuration[17,18], at room temperature. All samples placed in the PA cell were irradiated by a laser diode module with an output optical power of about 60 mW (seeFig.2) and a λ = 405 nm spectral wavelength.…”

mentioning

confidence: 99%

Interfacial thermal resistance between porous layers: Impact on thermal conductivity of a multilayered porous structure

Lishchuk

Dekret

Pastushenko

et al. 2018

International Journal of Thermal Sciences

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Features of thermal transport in multilayered porous silicon nanostructures are considered. Such nanostructures were fabricated by electrochemical etching of monocrystalline Si substrates by applying periodically changed current density.Hereby, the multilayered structures with specific phononic properties were formed. Photoacoustic (PA) technique in gas-microphone configuration was applied for thermal conductivity evaluation. Experimental amplitude-frequency dependencies were adjusted by temperature distribution simulation with thermal conductivity of the multilayered porous structure as a fitting parameter. The experimentally determined values of thermal conductivity were found to be significantly lower than theoretically calculated ones. Such difference was associated with the presence of thermal resistance at the interfaces between porous layers with different porosities arising because of elastic parameters mismatch (acoustical mismatch). Accordingly, the magnitude of this interfacial thermal resistance was experimentally evaluated for the first time.Furthermore, crucial impact of the resistance on thermal transport perturbation in a multilayered porous silicon structure was revealed.generations of integrated circuits (ICs), three-dimensional (3D) integration and ultrafast high-power density transistors has led to a steep increase in microprocessor chip heat flux and growing concern over the emergence of on-chip hot spots. Understanding thermal transport at the nanoscale is therefore crucial for a fundamental description of energy flow in nanomaterials, as well as a critical issue toward achieving optimal performance and reliability of modern electronic, optoelectronic, photonic devices and systems. Thermal transport at the nanoscale is fundamentally different from that at the macroscale and is determined by the distribution of carrier mean free paths and energy dispersion in a material, the dimension of the structure and the distance over which heat is propagated. The opportunity to shape new nanostructures that efficiently scatter phonons, reducing the thermal conductivity, without altering the electrical properties of the material enables the potential implementation of proficient thermoelectric devices to work as coolers or power generators from waste heat [1][2][3][4]. Recently, there has been much interest in the thermal conductivity of semiconductor superlattices (SLs) due to their promising applications in a variety of devices.Since important surface-to-volume fraction in nanostructured materials, heat conduction across solid-solid interface predominates thermal transport there.Particularly, in SLs, multiple interfaces between different materials play a critical role in the thermal conductivity reduction [5,6]. Cutting-edge experimental techniques have enabled the measurements of the in-plane [7] and cross-plane [8] thermal conductivity

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Thermal conductivity of partially amorphous porous silicon by photoacoustic technique

Cited by 20 publications

References 15 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 and Electrophysical Properties of Porous Silicon

Interfacial thermal resistance between porous layers: Impact on thermal conductivity of a multilayered porous structure

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