AVS 52nd International Symposium
    Electronic Materials and Processing Tuesday Sessions
       Session EM-TuP

Paper EM-TuP11
Oxygen Doping of DNA Molecules Using Rapid Thermal Processor at Low Temperature

Tuesday, November 1, 2005, 4:00 pm, Room Exhibit Hall C&D

Session: Electronic Materials and Processing Poster Session
Presenter: M.W. Yoon, Sungkyunkwan University, Korea
Authors: M.W. Yoon, Sungkyunkwan University, Korea
J.M. Lee, Sungkyunkwan University, Korea
K.-S. Kim, Sungkyunkwan University, Korea
Y.-H. Roh, Sungkyunkwan University, Korea
Correspondent: Click to Email
Recent studies on the electrical conduction of the deoxyribonucleic acid (DNA) strands reveal that they may act as semiconductor materials, suggesting that they might be used for the nano-electronic devices in the future. Furthermore, semiconducting properties can be controlled by gas (e.g., O@sub 2@) doping the DNA molecules. For example, it has been reported that O@sub 2@ doping of poly(dG)-poly(dC) DNA molecules at room temperature results in p-type semiconductor-like DNA molecules. In this work, we investigated the possibility of carrier doping of various types of DNA molecules including poly(dG)-poly(dC), DNA poly(dA)-poly(dT) and lambda DNA molecules at low temperature (e.g., room temperature, 90, 100, 130 °C) using a rapid thermal processor. Doping gases used in this work were N@sub 2@ and O@sub 2@. Annealing at low temperature in vacuum (i.e., without gas doping) was also performed to clarify the roles of both gas sources and heat treatment. Results obtained in this work show that both O@sub 2@ doping and heat treatment have certain roles to change the conduction properties of DNA molecules. Specifically, the conductivity of poly(dG)-poly(dC) molecules increases as annealing temperature raises regardless of the gas types. However, the highest value of conductivity at given annealing temperature was always obtained from the samples annealed at O@sub 2@ ambient, suggesting that O@sub 2@ doping is more effective to make p-type semiconductor-like poly(dG)-poly(dC) molecules. On the contrary, O@sub 2@ doping of poly(dA)-poly(dT) and lambda DNA molecules results in the reduction of conductivity. This phenomenon suggests that poly(dA)-poly(dT) and lambda DNA molecules behave like a n-type semiconductor due to O@sub 2@ doping.