SERS-active nanoaggregates observed with near-infrared laser excitation

Dustin J. Maxwell; Shuming Nie

doi:10.1117/12.430761

18 June 2001 SERS-active nanoaggregates observed with near-infrared laser excitation

Dustin J. Maxwell, Shuming Nie

Proceedings Volume 4258, Nanoparticles and Nanostructured Surfaces: Novel Reporters with Biological Applications; (2001) https://doi.org/10.1117/12.430761
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

Abstract

Using wide-field illumination, optically active 'hot' particles can be screened from a heterogeneous colloid using a near-IR excitation source. Atomic force microscopy (AFM) correlated with surface-enhanced Raman scattering (SERS) measurements reveal that the majority of these particles are small nanoparticle aggregates. This finding indicates a strong dependence between particle size and Raman enhancement. Furthermore, these 'hot' nanoaggregates display an intermittent on-off emission behavior similar to 'blinking' SERS exhibited at 488 nm and 514 nm laser excitation. This behavior, not observed in bulk SERS studies, can only be examined at the single particle level because of variations in particle size, shape, and surface defects. Further examination at the single particle level using a near-IR excitation source could led to new insights regarding the fundamental nature of 'hot' particles as well as the SERS mechanism.

Citation Download Citation

Dustin J. Maxwell and Shuming Nie "SERS-active nanoaggregates observed with near-infrared laser excitation", Proc. SPIE 4258, Nanoparticles and Nanostructured Surfaces: Novel Reporters with Biological Applications, (18 June 2001); https://doi.org/10.1117/12.430761

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available