| AVS 58th Annual International Symposium and Exhibition | |
| Nanometer-scale Science and Technology Division | Tuesday Sessions |
| Session NS-TuP |
| Session: | Nanometer-scale Science and Technology Division Poster Session |
| Presenter: | Jinhee Heo, Korea Institute of Materials Science, South Korea |
| Authors: | J.H. Heo, Korea Institute of Materials Science, South Korea H.J. Kim, Sungkyunkwan University, South Korea |
| Correspondent: | Click to Email |
Recently, the Tin-oxide(SnO2) has been widely used in the fabrication of various gas(O2, CO, NOx) detecting sensor. Basically, the SnO2 is n-type semiconductor which has a wide band gap, about 3.99eV. Also, thin film of SnO2 has been known as a transparent electrode and it is applicable for a various electronic parts. Nowadays, research on SnO2 nano-wire characterization is very actively performed because it is able to realize a micro-sensor array with conventional Silicon processing. However, it isn’t easy to align a single SnO2 nano-wire on the specific site for the fabrication of integrated gas sensoer device. To achieve a high-performance gas-sensor with SnO2, we need to make integrated single SnO2 nano-wire 2 electrode devices. In this study, we employed DNA-templated alignment using a combination of molecular combing and surface-patterning techniques to form a Au nanoparticle chain as a catalyst. It is possible to obtain parallel and latticed nanostructures consisting of DNA molecules and thus DNA-templated Au nano-wires aligned at 400nm intervals.[1,2] After that, a single SnO2 nano-wire which had been synthesized on the Au nanoparticle by a thermal process.[3,4] By using the AFM probing technique, a Rh coated conducting cantilever can approach a single SnO2 nano-wire in nano scale and get the I-V curves with sweeping applied voltage between Au electrode and cantilever with a controlled concentration of Oxygen in measuring chamber to change the ionosorption rate. From the results of such experiments, we selectively grow SnO2 nano-wires and verified Oxygen detecting ability which would be necessary for the realization of micro-sensor array.
[1] Hyung Jin Kim, Yonghan Roh, Seong Kyu Kim and Byungyou Hong, “Fabrication and characterization of DNA-templated conductive gold nanoparticle chains”, J. of Applied Physics 105, 074302 (2009)
[2] Hyung Jin Kim, Yonghan Roh and Byungyou Hong, “Selective Formation of a Latticed Nanostructure with the Precise Alignment of DNA-Templated Gold Nanowires”, Langmuir article 26(23),18315-18319 (2010)
[3] R.S. Wagner and W.C. Ellis, “Vapor-liquid-solid mechanism of single crystal growth”, Appl. Phys. Lett. 4, 89 (1964)
[4] Y. Wu and P. Yang, “Direct Observation if Vapor-liquid-solid nano-wire growth”, J. Am. Chem. Soc. 123, 3165 (2001)