Luminescence properties of Eu3+ or Dy3+/Au co-doped SiO2 nanoparticles

Petit, Laëticia; Griffin, Jelani; Carlie, Nathan; Jubera, Véronique; Garcia, Maurie E.; Hernández, Florencio E.; Richardson, Kathleen

doi:10.1016/j.matlet.2007.01.072

Cited by 22 publications

(11 citation statements)

References 15 publications

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“…SiO 2 NP surface modification was carried out based on methods reported in the literature [18,19,21,23,24] with some modifications. The SiO 2 NPs obtained in Section 2.3.1 were treated with an appropriate amount of APS modifier under vigorous stirring to functionalize the SiO 2 NPs with -NH 2 functional groups.…”

Section: Methodsmentioning

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: Methodsmentioning

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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“…In this regard, the use of noble nanostructures in solid phase as fluorescence enhancers is an attractive challenge and has been studied [34][35][36][37][50][51][52]. A nanometer size of noble colloids in solution was incorporated into a borosilicate amorphous network of 10B 2 O 3 -90SiO 2 , TeO 2 -PbO-GeO 2 and SiO 2 together with Eu ions via a sol-gel route.…”

Section: (5) the Effect Of Solid Phasementioning

confidence: 99%

“…Moreover, Selvan et al [34][35][36][37] has studied noble nanoparticle/Eu ion doped SiO 2 gels, and they also found that the fluorescence intensity of Eu ion was enhanced by the intensified electromagnetic field around Eu ion, which prove the potential application values of SEF in the optical materials.…”

Section: Introductionmentioning

confidence: 95%

“…Several points contribute to these lacks. Firstly, the distance between noble nanoparticles and Eu ion are difficult to be controlled according to the previous works [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. Secondly, the absorption of noble nanoparticles is few discussions on improving fluorescence efficiency and intensity of Eu complexes.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Noble Metal Nanoparticles on the Luminescent Properties of Europium Complex

Sun¹,

Guo²,

Liu³

et al. 2010

CNANO

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Recent theoretical progress in understanding the effect of noble metal nanoparticles on the luminescent properties of europium complex was reviewed. The observed enhancement fluorescence results from surface-enhanced fluorescence (SEF) based on the surface plasmon resonance (SPR) of noble metal nanoparticles. And the observed quenching fluorescence is attributed to the re-absorption of surface plasmon resonance and noble metal nanoparticles scattering. And then the enhancing and quenching effects strongly depend on size, shape, concentration, surrounding medium of noble metal nanoparticle and the structure of europium complex. Furthermore, the mechanism of surface-enhanced fluorescence, and physical process between noble metal nanoparticles and europium complex were also discussed in detail. These discussions are very important to further improve enhancement factor, which is key to application in optical materials for the surface-enhanced fluorescence phenomenon of noble metal nanoparticles.

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“…Currently, the modification of nanosilica is focused on stoichiometric amorphous nanosilica doped with the rare earth elements [6][7][8]. As is well known, rare earth elements have been widely applied in various materials as effective doping agents [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Study on Ce‐Doped Nonstoichiometric Nanosilica for Promoting Properties of Polysulfone Membranes

Zhang

et al. 2010

Chem Eng & Technol

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Using the sol-gel method a series of nonstoichiometric nanosilica doped with the rare earth element Ce (Ce x Si 1-x O 2-d , x = 0.0-0.14) were prepared in order to modify the physicochemical properties of the nanosilica surface and to enhance the strength of the Ce-nanosilica/polysulfone composite membranes. The Ce xSi 1-x O 2-d samples were characterized by Fourier transform infrared spectra, X-ray diffraction and X-ray photoelectron spectra. The observations from these characterizations suggest that most Ce atoms enter the silica framework to form a Ce-O-Si solid solution while the cubic CeO 2 phase is segregated when x >0.08. Transmission electron microscopy images show that Ce x Si 1-x O 2-d particles are spherical with a uniform size distribution in the range of 30-50 nm and contain some inner pores with sizes up to a few nanometers. Specifically, Ce 0.08 Si 0.92 O 2-d -700 calcined at 700°C shows the biggest surface area, the smallest pore size and the highest hydrophilicity, which makes the Ce 0.08 Si 0.92 O 2-d /polysulfone composite membranes (8.0 wt %) exhibit the strongest mechanical strength (3.223 MPa), which is enhanced by more than 100% in comparison with the pure polymer membrane.

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Luminescence properties of Eu3+ or Dy3+/Au co-doped SiO2 nanoparticles

Cited by 22 publications

References 15 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

Effects of Noble Metal Nanoparticles on the Luminescent Properties of Europium Complex

Study on Ce‐Doped Nonstoichiometric Nanosilica for Promoting Properties of Polysulfone Membranes

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