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Heat Transfer from Optically Excited Gold Nanostructures into Water, Sugar, and Salt Solutions

Green, Andrew J.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1376498592

Abstract Details

2013, Doctor of Philosophy (PhD), Ohio University, Chemistry (Arts and Sciences).
Nanotechnology has introduced a wide variety of new behaviors to study and understand. Metal nanostructures are of particular interest due to their ability to generate large amounts of heat when irradiated at the plasmon resonance. Furthermore, heat dissipation at the nanoscale becomes exceedingly more complicated with respect to bulk behavior. What are the credentials for a heat carrier to move across an interface? Is it important for both materials to have similar vibrational density of states? What changes if one material is a liquid? All of these questions have open ended answers, each of which hold potential for new technologies to be exploited once understood. This dissertation will discuss topics exploring the transfer of heat from an optically excited gold nanoparticle into a surrounding liquid. Gold nanostructures are created using conventional electron beam lithography with lift-off. The nanostructures are deposited onto a thin film thermal sensor composed of AlGaN:Er3+. Erbium(III) has two thermally coupled excited states that can be excited with a 532nm laser. The relative photoluminescence from these excited states are related by a Boltzmann factor and are thusly temperature dependent. A scanning optical microscope collects an image of Er3+ photoluminescence while simultaneously exciting the gold nanostructure. The nanostructure temperature is imaged which is directly related to the surrounding's heat dissipation properties. The first of two topics discuss the heat dissipation and phase change properties of water. A gold nanostructure is submersed under water and subsequently heated with a 532 nm laser. The water immediately surrounding the nanodot is can be superheated beyond the boiling point up to the spinodal decomposition temperature at 594 ± 17 K. The spinodal decomposition has been confirmed with the observation of critical opalescence. We characterize the laser scattering that occurs in unison with spinodal decomposition due to an increased coherence length associated with the liquid-liquid transition. The second topic will measure the change in heat dissipation with respect to solute adhesion onto the nanoheater. A small amount of aqueous solute molecules (1 solute molecule in 550 water molecules) dramatically increases the heat dissipation from a nanoparticle into the surrounding liquid. This result is consistent with a thermal conductance that is limited by an interface interaction where minority aqueous components significantly alter the surface properties and heat transport through the interface. The increase in heat dissipation can be used to make an extremely sensitive molecular detector that can be scaled to give single molecule detection without amplification or utilizing fluorescence labels.
Hugh Richardson, Dr. (Advisor)
Jeffery Rack, Dr. (Committee Member)
Michael Jensen, Dr. (Committee Member)
Martin Kordesch, Dr. (Committee Member)
84 p.
Chemistry; Physical Chemistry; Physics; Solid State Physics
Gold Nanoparticle; Heat Transfer; Kapitza Resistance; Thermal Conductance; Lithography; Erbium

Recommended Citations

Citations

  • Green, A. J. (2013). Heat Transfer from Optically Excited Gold Nanostructures into Water, Sugar, and Salt Solutions [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1376498592

    APA Style (7th edition)

  • Green, Andrew. Heat Transfer from Optically Excited Gold Nanostructures into Water, Sugar, and Salt Solutions. 2013. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1376498592.

    MLA Style (8th edition)

  • Green, Andrew. "Heat Transfer from Optically Excited Gold Nanostructures into Water, Sugar, and Salt Solutions." Doctoral dissertation, Ohio University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1376498592

    Chicago Manual of Style (17th edition)

ohiou1376498592
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© 2013, some rights reserved.Creative Commons License Heat Transfer from Optically Excited Gold Nanostructures into Water, Sugar, and Salt Solutions by Andrew J. Green is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Ohio University and OhioLINK.
Release 3.2.12