Optical properties of materials based on oxidized porous silicon and their applications for UV protection

Pavlikov, A. V.; Lartsev, Arseniy V.; Gayduchenko, Igor; Timoshenko, V. Yu.

doi:10.1016/j.mee.2011.06.005

Cited by 32 publications

(14 citation statements)

References 13 publications

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“…In the past decade, porous silicon (pSi) has gained significant momentum within the biomedical field because of desirable traits such as favorable degradability, biocompatibility, and photoluminescence . These unique set of qualities allowed pSi to be applied to applications ranging from optics and biosensors to microelectronics and tissue engineering . Moreover, the flexible nature of pSi permits the adjustment of fabrication parameters to modify precise characteristics (e.g., size, shape, surface, pore size) and has made pSi particularly favorable for drug delivery applications.…”

Section: Introductionmentioning

confidence: 99%

Degradation and biocompatibility of multistage nanovectors in physiological systems

Martinez

Evangelopoulos

Chiappini

et al. 2013

J Biomedical Materials Res

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The careful scrutiny of drug delivery systems is essential to evaluate and justify their potential for the clinic. Among the various studies necessary for pre-clinical testing, the impact of degradation is commonly overlooked. In this paper, we investigate the effect of fabrication (porosity and nucleation layer) and environment (buffer and pH) factors on the degradation kinetics of multi-stage nanovectors (MSV) composed of porous silicon. The degradation by-products of MSV were exposed to endothelial cells and analyzed for detrimental effects on cellular internalization, architecture, proliferation, and cell cycle. Increases in porosity resulted in accelerated degradation exhibiting smaller sized particles at comparable times. Removal of the nucleation layer (thin layer of small pores formed during the initial steps of etching) triggered a premature collapse of the entire central porous region of MSV. Variations in buffers prompted a faster degradation rate yielding smaller MSV within faster time frames while increases in pH stimulated erosion of MSV and thus faster degradation. In addition, exposure to these degradation by-products provoked negligible impact on the proliferation and cell cycle phases on primary endothelial cells. Here, we propose methods that lay the foundation for future investigations towards understanding the impact of the degradation of drug delivery platforms.

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Section: Introductionmentioning

confidence: 99%

Degradation and biocompatibility of multistage nanovectors in physiological systems

Martinez

Evangelopoulos

Chiappini

et al. 2013

J Biomedical Materials Res

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“…The output signal from the untreated porous silicon sensor is a weak signal. The surface treatment of porous silicon with TiO 2 and SnO 2 will improve the output signal from the sensor and hence enhancing the sensing capabilities [4][5][6], There are several axes for scientific research and applications within the following chemical sensor [7][8][9], tissue engineering [10], cell culture [11], drug delivery [12], biotechnology, gas separation and microelectronics [13]. Series applications of PS in sensor technology have been based on the change of conductivity or capacity of a material upon adsorption of gas molecules [14].…”

Section: Introductionmentioning

confidence: 99%

Morphological and Electrical Properties of gold nanoparticles /macroPorous Silicon for CO2 Gas

2018

ijs

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In this work, the fine structure macro-porous silicon (macroPS) substrate was prepared by photo-electro-chemical etching of n-type silicon wafer. Ultraviolet illumination condition of wavelength 360nm wavelength and intensity of about 100mW/cm 2 with etching current density of about 50 mA/cm 2 and etching time 5 min was employed. The Hybrid device gold nanoparticles /macroPorous Silicon (AuNPs/macroPS) was fabricated by deposition AuNPs into mPS substrate Via immersion plating process of macroPS in the solution of HAuCl4 with the (10 -3 M) concentration and 2min immersion time. The characteristics of PS before and after immersion process were investigated by scanning electron microscopy (SEM), EDS, X-Ray diffraction (XRD), photoluminescence (PL) and Infrared spectroscopy (FTIR). The J-V characteristics of sandwich structure showed that the maximum sensitivity of the AuNPs/macro PS was about (90.5%)for compared with macro-PS substrate. The current-voltage characteristics were performed in primary vacuum with a base pressure of about 0.2mbar and CO2 with 1mbare concentrations. Significant enhancement was observed in sensitivity of the AuNPs/macroPS hybrid device and temporal response after deposition the AuNPs. Science, 2018, Vol. 59, No.1A, pp: 57- Keywords IntroductionAt present Silicon is the main material of micro-electronics; however it is not commonly used in opto-electronics. The reason is owing to the inherent nature of the indirect transition in the band-edge emission. When the visible photoluminescence (PL) of electrochemically etched porous silicon (PS) was reported by Canham in 1990, the material has been extensively studied to explain luminescence mechanism and to investigate its possible use as a new material for the optical device application [1]. The current devices have been proved not only to be individually low-cost and low-power devices, owing to the formation of electroless deposited low resistance [2,3]. A version process for coating the devices by the electroless deposition of metals provided enhanced sensitivity and selectivity to NO x , CO, and NH3. The carbon monoxide (CO 2 ) is normally classified as inert gas inters of an acid-base reaction. The output signal from the untreated porous silicon sensor is a weak signal. The surface treatment of porous silicon with TiO 2 and SnO 2 will improve the output signal from the sensor and hence enhancing the sensing capabilities [4-6], There are several axes for scientific research and applications within the following chemical sensor [7][8][9], tissue engineering [10], cell culture [11], drug delivery [12], biotechnology, gas separation and microelectronics [13]. Series applications of PS in sensor technology have been based on the change of conductivity or capacity of a material upon adsorption of gas molecules [14]. The gas detection can be carried out to a wide range of physical, chemical, electrochemical and optical principles [15]. Advantages of PS sensors are low cost, room temperature operation and possible integration with electr...

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“…Nanoporous silicon is widely used for separating gas or particle [1][2][3] and can be applied in biosensors [4], optics [5,6], tissue engineering [7] and radiotherapy [8]. For those applications, the integration with other components like micropump can produce one complete system.…”

Section: Introductionmentioning

confidence: 99%

Self-Adjusting Electrochemical Etching Technique for Producing Nanoporous Silicon Membrane

Burham¹,

Hamzah²,

YeopMajlis³

2017

New Research on Silicon - Structure, Properties, Technology

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This chapter presents the technique in producing the nanoporous silicon membrane using electrochemical etching technique. Electrochemical etching technique is a self-adjusting technique due to its ability to control transfer of ion to form pore by manipulating certain parameters. There are several parameters that have been manipulated to study the effect of each parameter to the pore formation by characterizing each component. The project starts with fabrication of silicon membrane and then continues with characterization of HF concentration, current density, doping and also alcohol diluents using field emission scanning electron microscopy (FESEM). The effect of each parameter is discussed in terms of pore size, pore formation and pore structure. Finally, the pore with size less than 100 nm and columnar structure has formed using this technique. The star-shaped structure is also formed through this experimental setup. Improved nanoporous silicon membrane can be applied for filtration and separating particles, especially in an artificial kidney.

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Optical properties of materials based on oxidized porous silicon and their applications for UV protection

Cited by 32 publications

References 13 publications

Degradation and biocompatibility of multistage nanovectors in physiological systems

Degradation and biocompatibility of multistage nanovectors in physiological systems

Morphological and Electrical Properties of gold nanoparticles /macroPorous Silicon for CO2 Gas

Self-Adjusting Electrochemical Etching Technique for Producing Nanoporous Silicon Membrane

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