Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 20, Issue 44, Pages 9867-9876Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm01990a
Keywords
-
Funding
- NSF (NIRT) [BES 0507036]
- NIH [R01 GM076440]
- NSF
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM076440] Funding Source: NIH RePORTER
Ask authors/readers for more resources
Noble metal nanoparticles (NPs) possess size- and shape-dependent optical properties, suggesting the possibility of tuning desired optical properties of ensemble NPs at single NP resolution and underscoring the importance of probing the sizes and shapes of single NPs in situ and in real-time. In this study, we synthesized twelve colloids of Ag NPs. Each colloid contains various sizes and shapes of single NPs, showing rainbow colors with peak-wavelength of absorption spectra from 393 to 738 nm. We correlated the sizes and shapes of single NPs determined by high-resolution transmission electron microscopy (HRTEM) with scattering localized surface plasmon resonance (LSPR) spectra of single NPs characterized by dark-field optical microcopy and spectroscopy (DFOMS). Single spherical (2-39 nm in diameter), rod (2-47 nm in length with aspect ratios of 1.3-1.6), and triangular (4-84 nm in length with thickness of 2-27 nm) NPs show LSPR spectra (lambda(max)) at 476 +/- 5 or 533 +/- 12, 611 +/- 23, and 711 +/- 40 nm, respectively. Notably, we observed new cookie-shaped NPs, which exhibit LSPR spectra (lambda(max)) at 725 +/- 10 nm with a shoulder peak at 604 +/- 5 nm. Linear correlations of sizes of any given shape of single NPs with their LSPR spectra (lambda(max)) enable the creation of nano optical rulers (calibration curves) for identification of the sizes and shapes of single NPs in solution in real time using DFOMS, offering the feasibility of using single NPs as multicolored optical probes for study of dynamics events of interest in solutions and living organisms at nm scale in real time.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available