Electrical characterization and analysis of carbon nanotube-peptide nucleic acid conjugates

Krishna V. Singh, Alfredo Martinez-Morales, Xiaoye Jing, Mihrimah Ozkan, Cengiz S. Ozkan, Fie Liu, Kang L. Wang

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We report for the first time electron transport measurements of covalently functionalized single-walled-carbon-nanotubes (SWNT) with peptide-nucleic-acid (PNA). Individual SWNT-PNA-SWNT conjugates were tested by aligning them across pre-patterned gold microelectrodes. Corresponding analysis reveal that these conjugates exhibit negative differential resistance (NDR) that is characteristics of resonant tunneling diodes (RTD). The NDR behavior was observed only in SWNT-PNA conjugates and not individually in SWNTs or PNA alone, making them suitable candidates for future molecular electronics. This NDR behavior can be attributed to the type of molecular bonding between peptide and SWNT and alignment of their band energies.

Original languageEnglish
Pages (from-to)205-208
Number of pages4
JournalJournal of Nanoelectronics and Optoelectronics
Issue number2
Publication statusPublished - 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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