Silica Nanoparticles Coated with Smaller Au Nanoparticles for the Enhancement of Optical Oxygen Sensing

2021 ◽  
Author(s):  
Wenwen Yin ◽  
Jiajie Sui ◽  
Guozhong Cao ◽  
Dana Dabiri
Keyword(s):  
Silica Nanoparticles ◽  
Au Nanoparticles ◽  
Oxygen Sensing

SERS-BASED AQUEOUS IMMUNOASSAY REALIZED WITH SILICA NANOPARTICLES

2011 ◽  
Vol 20 (01) ◽  
pp. 63-73
Author(s):  
C. Y. SONG ◽  
Z. Y. WANG ◽  
J. YANG ◽  
R. H. ZHANG ◽  
H. WU ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Gold Nanoparticles ◽  
Detection Limit ◽  
Silica Nanoparticles ◽  
Hot Spots ◽  
Au Nanoparticles

A simple, sensitive SERS-based immunoassay realized in aqueous solution is demonstrated with a sandwich immune protocol. In such an immunoassay, antibodies-immobilized silica nanoparticles served as the immune substrate while 4MBA-labeled immuno-Au nanoparticles are used as the immune sensors. According to the TEM images, it is clear that the immune gold nanoparticles are embedded onto the surfaces of the silica nanoparticles specifically after the immunoreaction. As a result, the aggregations of gold nanoparticles have been formed with SERS-active "hot spots" on the dimers or multimers. The SERS results confirm that the method proposed in this paper is an effective way for SERS-based aqueous immunoassay and that the detection limit is as low as 0.1 ng/mL.

scholarly journals Oxygen Sensing with Perfluorocarbon-Loaded Ultraporous Mesostructured Silica Nanoparticles

ACS Nano ◽  
2017 ◽  
Vol 11 (6) ◽  
pp. 5623-5632 ◽  
Author(s):  
Amani L. Lee ◽  
Clifford T. Gee ◽  
Bradley P. Weegman ◽  
Samuel A. Einstein ◽  
Adam R. Juelfs ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Oxygen Sensing ◽  
Mesostructured Silica

A Facile Method to Synthesis Hollow Silica Ellipsoids and Their Derivatives

2012 ◽  
Vol 1453 ◽  
Author(s):  
Henan Zhang ◽  
Daniel L. Akins
Keyword(s):  
Silica Nanoparticles ◽  
Chemical Etching ◽  
Au Nanoparticles ◽  
Silica Surface ◽  
Hollow Silica ◽  
Synthesis Conditions ◽  
Wet Chemical ◽  
Wet Chemical Etching

ABSTRACTWe have utilized wet-chemical etching of ellipsoidal silica nanoparticles to form silica nanoshells of a range of elliptical morphologies. The thicknesses of the silica ellipsoidal nanoshells are controlled through variation of synthesis conditions. A mechanism has been proposed to explain how the nanoshells are formed, and we have demonstrated that the porosity of the silica ellipsoid plays a role in the dissolution-regrowth process. We have also, via appropriate functionalization of the silica surface, coated the ellipsoidal nanoshells with Au nanoparticles.

scholarly journals A redox responsive controlled release system using mesoporous silica nanoparticles capped with Au nanoparticles

RSC Advances ◽  
2017 ◽  
Vol 7 (57) ◽  
pp. 35704-35710 ◽  
Author(s):  
Hongnan Qu ◽  
Liangrong Yang ◽  
Jiemiao Yu ◽  
Tingting Dong ◽  
Meng Rong ◽  
...  
Keyword(s):  
Controlled Release ◽  
Mesoporous Silica ◽  
Sustained Release ◽  
Silica Nanoparticles ◽  
Au Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Release System ◽  
Redox Responsive ◽  
Controlled Release System

A redox responsive controlled and sustained release system based on the host–guest interaction between ferrocene and β-cyclodextrin was developed.

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