Dr. Joshua Martin

• Develop advanced metrology techniques and apparatus to characterize the physical properties of thermoelectric and other energy conversion materials

• Investigate the structure-property relationships of novel energy conversion materials
• Inorganic materials of interest: functional nanocomposites, oxides, open-structured frameworks, and combinatorial films

Figure 1: Power conversion diagram for a thermoelectric device, where a temperature gradient is converted into electrical energy.

Figure 2(left): Temperature dependent power factor for polycrystalline type I clathrate materials in comparison to single crystal data (dashed line). Appl. Phys. Lett. 92, (2008).; Figure 3(right): Seebeck coefficient and power factor vs. carrier concentration demonstrating an enhancement in nanocomposite PbTe (filled circles) in comparison to bulk PbTe (dashed line). Phys. Rev. B 79, (2009).

Awards and Honors

• Summer Research Fellowship, Department of Physics, USF, 2007

• Graduate Publication Award, College of Arts and Sciences, USF, 2007

• Fred L. and Helen M. Tharp Physics Graduate Scholarship, USF, 2006

• General Motors R&D Internship, Warren, MI, 2005

• Student Poster Award, Symposium S, Materials Research Society Fall 2003 Meeting, Boston, MA, 2003

Publications Prior to Joining NIST:

• J. Martin, G. S. Nolas, H. Wang, Optimization of the thermoelectric properties of Ba8Ga16Ge30, Appl. Phys. Lett., 92, 222110 (2008).
  
• J. Martin, G. S. Nolas, H. Wang, J. Yang, Thermoelectric Properties of Silicon-Germanium Type I Clathrates, J. Appl. Phys. 102, 103719 (2007).
  
• J. Martin, G. S. Nolas, W. Zhang, and L. Chen, PbTe nanocomposites synthesized from PbTe nanocrystals, Appl. Phys. Lett. 90, 222112 (2007).