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'Nanosculpture' Could Enable New Types Of Heat Pumps And Energy Converters

Date:
July 24, 2008
Source:
Rensselaer Polytechnic Institute
Summary:
Researchers have discovered a new technique for growing single-crystal nanorods and controlling their shape using biomolecules. The research could enable the development of smaller, more powerful heat pumps and devices that harvest electricity from heat.

Researchers at Rensselaer discovered a new method to create “branched” nanorods, as seen in this scanning electron microscope image. Such nanorods could one day enable new nanoscale thermoelectric devices for power generation, as well as nanoscale heat pumps for cooling hot spots in nanoelectronics devices.
Credit: Rensselaer/Ramanath

A new technique for growing single-crystal nanorods and controlling their shape using biomolecules could enable the development of smaller, more powerful heat pumps and devices that harvest electricity from heat. 

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Researchers at Rensselaer Polytechnic Institute have discovered how to direct the growth of nanorods made up of two single crystals using a biomolecular surfactant. The researchers were also able to create “branched” structures by carefully controlling the temperature, time, and amount of surfactant used during synthesis. 

“Our work is the first to demonstrate the synthesis of composite nanorods with branching, wherein each nanorod consists of two materials — a single-crystal bismuth telluride nanorod core encased in a hollow cylindrical shell of single-crystal bismuth sulfide,” said G. Ramanath, professor of materials science and engineering at Rensselaer and director of the university’s Center for Future Energy Systems, who led the research project. “Branching and core-shell architectures have been independently demonstrated, but this is the first time that both features have been simultaneously realized through the use of a biomolecular surfactant.”

Most nanostructures comprised of a core and a shell generally require more than one step to synthesize, but these new research results demonstrate how to synthesize such nanorods in only one step.

“Our single-step synthesis is an important development toward realizing large-scale synthesis of composite nanomaterials in general,” said Arup Purkayastha, who worked on the project as a postdoctoral researcher at Rensselaer and is now a scientist with Laird Technologies in Bangalore, India. 

Because of their attractive properties, core-shell nanorods are expected to one day enable the development of new nanoscale thermoelectric devices for power generation, as well as nanoscale heat pumps for cooling hot spots in nanoelectronics devices. 

“Our discovery enables the realization of two very important attributes for heat dissipation and power generation from heat,” Ramanath said. “First, the core-shell junctions in the nanorods are conducive for heat removal upon application of an electrical voltage, or generating electrical power from heat. Second, the branched structures open up the possibility of fabricating miniaturized conduits for heat removal alongside nanowire interconnects in future device architectures.”

The researchers discovered that synthesis at high temperatures or with low amounts of the biomolecular surfactant L-glutathonic acid (LGTA) yields branched nanorod structures in highly regulated patterns. In contrast, synthesis at low temperatures or with high levels of LGTA results in straight nanorods without any branching. It is interesting to note that at the point of branching, atoms in the branch resemble a mirror image of the parent crystal – a finding that reinforces Ramanath’s conclusion that LGTA is able to induce branching through atomic-level sculpture. 

“Since LGTA is similar to biological molecules, our discovery could be conceivably used as a starting point to explore the use of proteins and enzymes to atomically sculpt such nanorod architectures through biological processes,” said Ramanath.


Story Source:

The above story is based on materials provided by Rensselaer Polytechnic Institute. Note: Materials may be edited for content and length.


Journal Reference:

  1. Purkayastha et al. Surfactant-Directed Synthesis of Branched Bismuth Telluride/Sulfide Core/Shell Nanorods. Advanced Materials, 2008; DOI: 10.1002/adma.200702572

Cite This Page:

Rensselaer Polytechnic Institute. "'Nanosculpture' Could Enable New Types Of Heat Pumps And Energy Converters." ScienceDaily. ScienceDaily, 24 July 2008. <www.sciencedaily.com/releases/2008/07/080717145054.htm>.
Rensselaer Polytechnic Institute. (2008, July 24). 'Nanosculpture' Could Enable New Types Of Heat Pumps And Energy Converters. ScienceDaily. Retrieved October 30, 2014 from www.sciencedaily.com/releases/2008/07/080717145054.htm
Rensselaer Polytechnic Institute. "'Nanosculpture' Could Enable New Types Of Heat Pumps And Energy Converters." ScienceDaily. www.sciencedaily.com/releases/2008/07/080717145054.htm (accessed October 30, 2014).

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