28 Jun 2013

Brief introduction to local surface plasmons (LSPRs) for nanoparticle color

Five Slides About

Submitted by Sarah K. St. Angelo, Dickinson College
Categories
Description: 

This is a very brief introduction to the origin of color in nanoparticle systems.  A link to a video is included in the slides that shows the addition of the reducing agent to the gold precursor solution.  The link is also available as a Web Resourse (below).

Learning Goals: 

A student should be able to explain the basic ideas of how color arises from metal nanoparticles.

Implementation Notes: 

This 5-slides would be good for a very brief introduction to nanoparticles and color.  I use similar presentations before my freshmen students make nanoparticles for the first time. 

Time Required: 
10 minutes or more depending on added discussion
Evaluation
Evaluation Methods: 

If students do a basic experiment making and/or aggregating nanoparticles, they should be able to explain some of the basic relationships they observe between color and likely relative sizes of particles/aggregates.

Creative Commons License: 
Creative Commons Licence

Comments

 

I think the past ppt could have been better explained. You might consider adding after "Longer wavelengths of light are able to excite the LSPR of larger nanoparticles"

Therefore, larger nanopartciles absorb longer wavelengths of light (for example red) and they appear purplish (based on artist's wheel),... or something of this sort.

Thank you for the comment!  I added a few more words to the final slide to make the point more strongly.  If it is "wordy" for some, the text box can be trimmed, depending on the needs of anyone using the ppt.

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