Electronic properties of electrospun undoped and antimony-doped tin oxide nanofibers

CHED 64

Idalia Ramos, iramos@mate.uprh.edu1, Yu Wang, wangyu@seas.upenn.edu1, Neliza Leon-Brito, nelizne@gmail.com1, Anamaris Melendez, anamarismel@gmail.com1, Glendalys Figueroa, glendalysff@hotmail.com1, Nicholas J. Pinto, nj_pinto@uprh.edu2, and Jorge J. Santiago-Aviles, santiago@seas.upenn.edu3. (1) Department of Physics and Electronics, University of Puerto Rico at Humacao, CUH Station, Humacao, PR 00791, (2) Department of Physics and Electronics, University of Puerto Rico - Humacao, 100 Road#908, Humacao, PR 00791, (3) Department of Electrical and Systems Engineering, University of Pennsylvania, 200 South 33rd Street, Philadelphia, 19104
Tin oxide is a binary semiconducting oxide with wide applications in sensors and optoelectronic devices. The recent advance in tin oxide nanofibers fabrication has stimulated expectations for their applications due to their quasi-one dimensional morphology. The expectations may be limited by our ability to modulate the electronic properties of the fibers. Based on our previous synthesis and characterization of electrospun tin oxide nanofibers, the authors continued investigating the electronic transport properties of single undoped and antimony-doped fibers. The conductivity of the fibers was studied at low temperatures from 300 to 15K. Results show that the conductivity of the undoped fibers decreases monotonically as the temperature decreases as well as the appearance of an anomalous peak at 260K that may be attributed to the chemi-absorbed molecules on the surface of the fiber. Conductivity measurements for the antimony-doped fibers suggest that the dominant conduction mechanism is three-dimensional variable-range hopping.
 

NSF Partnership for Research and Education in Materials
1:30 PM-4:40 PM, Sunday, 10 September 2006 San Francisco Marriott -- Salon 11, Oral

Division of Chemical Education

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006