Hostname: page-component-7c8c6479df-hgkh8 Total loading time: 0 Render date: 2024-03-27T11:46:56.926Z Has data issue: false hasContentIssue false

Thermo-optical Properties of Nanoparticles and Nanoparticle Complexes Embedded in Ice: Characterization of Heat Generation and Actuation of Larger-scale Effects

Published online by Cambridge University Press:  26 February 2011

Hugh H. Richardson
Affiliation:
richards@helios.phy.ohiou.edu, Ohio University, Chemistry and Biochemistry, 231 Clippinger Laboratories, Ohio Univeristy, Dept. of Chemistry and Biochemistry, Athens, OH, 45701, United States, (740) 517-8488
Zachary N. Hickman
Affiliation:
zh349103@ohio.edu, Ohio University, Chemistry and Biochemistry, Athens, OH, 45701, United States
Alyssa C. Thomas
Affiliation:
at137999@ohio.edu, Ohio University, Chemistry and Biochemistry, Athens, OH, 45701, United States
Martin E. Kordesch
Affiliation:
kordesch@ohio.edu, Ohio University, Physics and Astronomy, Athens, OH, 45701, United States
Alexander O. Govorov
Affiliation:
govorov@helios.phy.ohiou.edu, Ohio University, Physics and Astronomy, Athens, OH, 45701, United States
Get access

Abstract

We have investigated the thermo-optical properties of gold NPs embedded in an ice matrix [1]. Resonant laser light of relatively weak intensity is able to melt ice with embedded Au NPs, whereas even a very intense laser beam does not melt ice alone. This comes from strong absorption in Au NPs in the regime of plasmon resonance. By recording time-resolved Raman signals, we observe the melting process and determine the threshold melting power , where is the background temperature. We also observe relatively large scattering in the threshold laser intensity that leads to melting of the ice because of the mesoscopic nature of the sample. We can understand this observation using the TEM images of NPs, showing that geometry of NP complexes varies greatly. In our recent theoretical paper we showed that the local temperature inside and around a NP complex depends strongly on its geometry, and this leads to large scattering for the measured as a function of the reduced temperature, for different complexes [2].

We recently discovered that NPs immobilized on glass surfaces can be characterized by single particle spectroscopy. Single and small NP clusters can be discriminated using the integrated intensity of the plasmon emission band. A cluster of four gold NPs has ∼ 4 times the intensity of a single gold NP. When the NPs are aggregated into a cluster then broadening of the intensity profile plot is not observed Gold NPs that are not clustered together but are found within the excitation volume will lead to a broadening of a cross sectional slice. We will use these principles to determine the amount of heat generation from single and clustered gold NPs.

[1] H. H. Richardson, Z. N. Hickman, A. O. Govorov, A. C. Thomas, W. Zhang, M. E. Kordesch, Nano Lett. (2006); DOI: 10.1021/nl060105l.

[2] A. O. Govorov, H. H. Richardson, W. Zhang, and T. Skeini, Nanoscale Res. Lett. 1, 100101 (2005).

Type
Research Article
Copyright
Copyright © Materials Research Society 2007

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Murray, C. B., Norris, D. J., and Bawendi, M. G., J. Am. Chem. Soc. 115, 8706 (1993).Google Scholar
2. Yu, S. H., Yoshimura, M., Moreno, J. M. C., Fujiwara, T., Fujino, T., and Teranishi, R., Langmuir 17, 1700 (2001).Google Scholar
3. Jiang, J., Bosnick, K., Maillard, M., and Brus, L., J. Phys. Chem. B 107, 9964 (2003).Google Scholar
4. Richardson, H. H., Hickman, Z. N., Govorov, A. O., Thomas, A. C., Zhang, W., and Kordesch, M. E., Nano Letters 6, 783 (2006).Google Scholar
5. Elghanian, R., Storhoff, J. J., Mucic, R. C., Letsinger, R. L., and Mirkin, C. A., Science 277, 1078 (1997).Google Scholar
6. Huang, X. H., El-Sayed, I. H., Qian, W., and El-Sayed, M. A., J. Am. Chem. Soc. 128, 2115 (2006).Google Scholar
7. Gobin, A. M., O'Neal, D. P., Watkins, D. M., Halas, N. J., Drezek, R. A., and West, J. L., Lasers in Surgery and Medicine 37, 123 (2005).Google Scholar
8. Lee, J., Govorov, A. O., and Kotov, N. A., Angewandte Chemie-International Edition 44, 7439 (2005).Google Scholar
9. Govorov, A. O., Wei, Z., Skeini, T. Richardson, H. H. Lee, J., and Kotov, N. A., Nanoscale Res. Lett., DOI 10.1007/s11671 (2006).Google Scholar