Multi-peak behavior of photoluminescence of silica particles heat-treated in hydrogen at elevated temperature

Xu, Guangqing; Zheng, Zongkun; Tang, Wei; Wu, Yijian

doi:10.1016/j.jlumin.2006.05.001

Cited by 19 publications

(8 citation statements)

References 11 publications

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“…The absorption bands at ∼3420 and ∼1620 cm −1 are attributed to the extension and flexural vibrations of O-H bonds in adsorbed water. The absorption bands at ∼3635 and ∼954 cm −1 are due to the vibration of Si-OH bonds [ 20 , 44 – 46 ].…”

Section: Resultsmentioning

confidence: 99%

A Large Response Range Reflectometric Urea Biosensor Made from Silica-Gel Nanoparticles

Alqasaimeh

Heng

Ahmad

et al. 2014

Sensors

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A new silica-gel nanospheres (SiO2NPs) composition was formulated, followed by biochemical surface functionalization to examine its potential in urea biosensor development. The SiO2NPs were basically synthesized based on sol–gel chemistry using a modified Stober method. The SiO2NPs surfaces were modified with amine (-NH2) functional groups for urease immobilization in the presence of glutaric acid (GA) cross-linker. The chromoionophore pH-sensitive dye ETH 5294 was physically adsorbed on the functionalized SiO2NPs as pH transducer. The immobilized urease determined urea concentration reflectometrically based on the colour change of the immobilized chromoionophore as a result of the enzymatic hydrolysis of urea. The pH changes on the biosensor due to the catalytic enzyme reaction of immobilized urease were found to correlate with the urea concentrations over a linear response range of 50–500 mM (R2 = 0.96) with a detection limit of 10 mM urea. The biosensor response time was 9 min with reproducibility of less than 10% relative standard deviation (RSD). This optical urea biosensor did not show interferences by Na+, K+, Mg2+ and NH4+ ions. The biosensor performance has been validated using urine samples in comparison with a non-enzymatic method based on the use of p-dimethylaminobenzaldehyde (DMAB) reagent and demonstrated a good correlation between the two different methods (R2 = 0.996 and regression slope of 1.0307). The SiO2NPs-based reflectometric urea biosensor showed improved dynamic linear response range when compared to other nanoparticle-based optical urea biosensors.

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Section: Resultsmentioning

confidence: 99%

A Large Response Range Reflectometric Urea Biosensor Made from Silica-Gel Nanoparticles

Alqasaimeh

Heng

Ahmad

et al. 2014

Sensors

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“…These nanometer-sized inorganic materials can represent an extensive range of optical and electrical properties [4,5]. Zinc silicate (Zn 2 SiO 4 ), as one of the most important family of functional inorganic materials, have wide applications in the fields of phosphors [6,7], lithium-ion batteries [8,9], paints [10], adsorbents [11] and electronic insulators [12] as well as rubber mixtures [13].…”

Section: Introductionmentioning

confidence: 99%

A simple sonochemical approach for synthesis and characterization of Zn2SiO4 nanostructures

Masjedi-Arani

Salavati‐Niasari

2016

Ultrasonics Sonochemistry

171

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Zn2SiO4 nanoparticles have been successfully prepared via a simple sonochemical method, for the first time. The effect of various parameters including ultrasonic power, ultrasonic irradiation time and different surfactants were investigated to reach optimum condition. The as-prepared nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmittance electron microscopy (TEM), Fourier transform infrared (FT-IR) spectra and energy dispersive X-ray microanalysis (EDX). The photocatalytic activity of Zn2SiO4 nano and bulk structures were compared by degradation of anionic dye methyl orange in aqueous solution under UV-light irradiation. Moreover, the cyclic voltammetry analysis of Zn2SiO4 nano and bulk structures were investigated.

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“…These nanometer-sized inorganic materials can exhibit a wide range of optical and electrical properties [4,5]. Novel properties would be obtained while the crystal structure of host materials was changed.…”

Section: Introductionmentioning

confidence: 99%

Multi-peak behavior of photoluminescence of silica particles heat-treated in hydrogen at elevated temperature

Cited by 19 publications

References 11 publications

A Large Response Range Reflectometric Urea Biosensor Made from Silica-Gel Nanoparticles

A Large Response Range Reflectometric Urea Biosensor Made from Silica-Gel Nanoparticles

A simple sonochemical approach for synthesis and characterization of Zn2SiO4 nanostructures

Preparation and characterization of Zn2SiO4: Mn phosphors with hydrothermal methods

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