I am trying to modify optical fiber with gold nanoparticles for particle plasmon resonance applications.
I am using 2% 3-Mercaptopropyl)dimethoxysilane (MPDMS)/Toluene as silanization.
I tried different time of fiber immersion in MPDMS (2 to 20h) and gold nanoparticle solution(2-16h). But no gold particles(AuNPs) stick to the optical fiber.
Can anyone give me some suggestions how to do this?
You can also suggest some other easy ways to modify fiber with AuNPs.
Gold salts can be solubilized in water, fiber should be immersed in the solution and very low dose of sodium borohydride solution can be dropped to this solution under stirring. AuNP is expected to get deposited on the fiber. The adhesion of the AuNP can be checked and method may need modification (pretreatment of fiber) in the case of less adhesion.
What is the material of your optical fibre and if there are any coatings or treatments it may have for optical brilliance you should know that?
Chandra K Dixit Optical fiber is made of glass and there is no coating on it.
Khalil Ur Rehman If it is glass, dip it in an Alkali (NaOH or KOH) followed by silanization. Also, be aware, if you decide to use mercaptosilanes then thiol ends would be reduces and it will be hard to attach to gold NPs. Instead activate your surface with an alkali and then wash extensively with water followed by dip coating in APTES and then curing it under heat. This will give you a good coating. After that you can choose to either directly deposit gold NPs on ther APTES modified surface or you can modify gold NPs with a linker having SH at one end and COOH at the other followed by using EDC/NHS chemistry. Try reading through some of my papers -
1. https://www.nature.com/articles/nprot.2011.304
2. Article Label-Free Optical Characterization Methods for Detecting Am...
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