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Diamondoid-functionalized nanogaps: from small molecules to electronic biosensing

Journal Article · · European Physical Journal. Special Topics
 [1];  [1];  [1];  [2];  [1]
  1. Univ. of Stuttgart, Stuttgart (Germany)
  2. Univ. of Stuttgart, Stuttgart (Germany); Argonne National Lab. (ANL), Argonne, IL (United States)
The potential of reading-out DNA molecules using functionalized electrodes embedded in nanopores is discussed here. Focus is given on functionalization using tiny diamond-like hydrogenated cages, the diamondoids. A derivative known as memantine of the smallest diamondoid is taken. This offers hydrogen bonding possibilities. Based on quantum-mechanical calculations, we first assess the interaction details of memantine with DNA units, the nucleotides. At a next step, nucleotides are placed within the nanogap formed by the diamondoid-functionalized electrodes. Quantum transport calculations are performed and show the high sensitivity of the electrodes in distinguishing among the different nucleotide types. We proceed by qualitatively revealing the influence of the DNA molecules by simply rotating the nucleotide within the nanogap. The effect of an aqueous environment is also included and the dynamic behavior of the conductance across the functionalized electrodes is addressed. Lastly, we discuss the relevance of our results in detecting DNA sequences.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
Deutsche Forschungsgemeinschaft (DFG); USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1559456
Journal Information:
European Physical Journal. Special Topics, Journal Name: European Physical Journal. Special Topics Journal Issue: 14 Vol. 227; ISSN 1951-6355
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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