| | | | | | | |
Indian Science Technology and Engineering facilities Map
Supplier Map
Service Map


Patent Details

Indian Institute of Technology (IIT) Roorkee 
Synthesis of highly NIR luminescent gold nanoparticles with high stokes shift 
Kalyan Kumar Sadhu and Meenaxi 
Indian Institute of Technology (IIT) Roorkee 
Application type:
Applied - 2016-06-30 
Application Number:
Applied at:
Entered by:
Indian Institute of Technology (IIT) Roorkee 
Gold nanoparticles are characterized by their Surface Plasmon Resonance (SPR) peaks, which vary with the size of gold nanoparticles. The particle size within the range 0.3 to 20 nm mainly pre dominates the luminescence properties of gold nanoparticles via surface coating with different types of ligands. Dissociation of polymeric Au(I) thiolates resulted in the formation of luminescent gold nanoparticles. Rigidification of Au(I) thiolate shell also enhanced the emission property. Enhancement of the NIR luminescence was possible due to the oxidation of thio-ligand by hydrogen peroxide at core-ligand interface. Recently, thiolate and sulfide binding units have been used to show very high luminescence up to 3.65% quantum yield. In case of citrate stabilization, CdSe core showed bright luminescence. However, citrate stabilized gold nanoparticles do not show any significant luminescence since its discovery more than fifty years back. In our attempt, we observed characteristic luminescent band from different citrate stabilized gold nanoparticles at 916 nm (Near Infra Red region, NIR) by excitation at 562 nm with Stokes shift greater than 350 nm in presence of controlled amount of aqua regia. Further addition of aqua regia reduced the luminescence intensity significantly. This material has potential in the imaging of cancer cells.  

It has always been the basic tenet of the Government of India, in generously funding R&D efforts at academic institutions over the years, that facilities established through such support be made available to those needing them and qualified to make use of them for their own research work

However, this was never easy or straightforward for, among other reasons, there was no ready source of information of what facility was available and where. Thanks to the Web, it is much easier today to have a national and regional “inventory of resources”, so as to match users with the resources they need, and to do all this in an efficient and transparent manner.

This can lead to a leap in R&D productivity and greatly enhance the effectiveness of public investment. This is the motivation behind I-STEM.
read less <<
Visitor Hit Counter
Toll Free Number : 1800 425 3281
Hosted at Indian Institute of Science
Copyright © 2019 I-STEM. All rights reserved    Audited by: STQC Bengaluru.