Spectral properties of bis-9-anthryl derivatives immobilised in silica xerogel

Kłonkowski, Andrzej M.; Ostaszewski, Ryszard; Widernik, Teresa

doi:10.1016/s0927-7757(02)00113-9

Cited by 8 publications

(6 citation statements)

References 19 publications

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“…[9][10][11][12][13][14][15][16][17][18] To prevent the dyes leaking out of the porous matrix, dyes have been covalently bound to the silica matrix. [ 12 , 14 , 19-24 ] One of the costs of such a strong bond is typically a decrease in quantum yield, and hence reduced fl uorescent brightness of the material.…”

Section: Introductionmentioning

confidence: 99%

Ultrabright Fluorescent Silica Mesoporous Silica Nanoparticles: Control of Particle Size and Dye Loading

Cho

Volkov

Sokolov

2011

Adv Funct Materials

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The synthesis of ultrabright fl uorescent mesoporous silica nanoparticles (UFSNPs) of various sizes loaded with different amounts of fl uorescent dye (Rhodamine 6G) is reported here. The dye is physically entrapped inside the nanochannels of the silica matrix created during templated sol-gel self assembly. Due to the specifi c nanoenvironment, the fl uorescence of the encapsulated dye molecules remains unquenched up to very high concentrations, which results in relatively high fl uorescence. The particle size (ranging from 20-50 nm) and dye loading (0.8-9.3 mg dye per g particles) are controlled by the timing of the synthesis and the concentration of several organotriethoxysilanes, which are coprecursors of silica. The quantum yields of the encapsulated dye range from 0.65 to 1.0. The relative brightness of a single particle is equivalent to the fl uorescence of 30-770 free nondimerized R6G dye molecules in water, or to that of 1.5-39 CdSe/ZnS quantum dots. Despite the presence of some hydrophobic groups on the particles' surfaces, colloidal suspensions of the particles are relatively stable (as monitored for 120 days).

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Section: Introductionmentioning

confidence: 99%

Ultrabright Fluorescent Silica Mesoporous Silica Nanoparticles: Control of Particle Size and Dye Loading

Cho

Volkov

Sokolov

2011

Adv Funct Materials

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“…Numerous attempts to embed organic dyes into silica xerogels and zeolites have been reported. [1][2][3][4][5][6][7][8][9] To prevent leakage of the dyes out of the porous matrix, dyes were typically covalently bound to the silica matrix. 4,6,[10][11][12][13][14][15] While photostability of such materials is higher than stability of pure dyes, it does not prevent bleaching substances, including oxygen, from penetration inside such a composite material.…”

Section: Introductionmentioning

confidence: 99%

Ultrabright fluorescent mesoporous silica particles

Sokolov

Volkov

2010

J. Mater. Chem.

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“…It seems that in general the silica acts as a catalyst in photodegradation processes of condensed aromatic systems (see our results in refs. [20,31,32]). …”

Section: Discussionmentioning

confidence: 99%