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. 2012;12(3):3578-3586.
doi: 10.3390/s120303578. Epub 2012 Mar 14.

Electrical characterization of gold-DNA-gold structures in presence of an external magnetic field by means of I-V curve analysis

Nadia Mahmoudi Khatir  1 , Seyedeh Maryam Banihashemian  1 , Vengadesh Periasamy  1 , Richard Ritikos  1 , Wan Haliza Abd Majid  1 , Saadah Abdul Rahman  1
Affiliations

Electrical characterization of gold-DNA-gold structures in presence of an external magnetic field by means of I-V curve analysis

Nadia Mahmoudi Khatir et al. Sensors (Basel). 2012.

Abstract

This work presents an experimental study of gold-DNA-gold structures in the presence and absence of external magnetic fields with strengths less than 1,200.00 mT. The DNA strands, extracted by standard method were used to fabricate a Metal-DNA-Metal (MDM) structure. Its electric behavior when subjected to a magnetic field was studied through its current-voltage (I-V) curve. Acquisition of the I-V curve demonstrated that DNA as a semiconductor exhibits diode behavior in the MDM structure. The current versus magnetic field strength followed a decreasing trend because of a diminished mobility in the presence of a low magnetic field. This made clear that an externally imposed magnetic field would boost resistance of the MDM structure up to 1,000.00 mT and for higher magnetic field strengths we can observe an increase in potential barrier in MDM junction. The magnetic sensitivity indicates the promise of using MDM structures as potential magnetic sensors.

Keywords: Metal-DNA-Metal (MDM); Schottky diode; magnetic field; magnetic sensor.

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Figures

Figure 1.
Figure 1.
Schematic diagram showing the sample preparation. (a) The sample preparation. (RCA); (b) The photoresist deposition and UV-exposure through the mask; (c) Chorumum deposition; (d) Gold deposition; (e) Lift off process.
Figure 2.
Figure 2.
Two electrodes L and R (L = left, R = right) with an insulator gap in the gold-DNA-gold structure in the presence of external magnetic field is placed inside cryostat connected to temperature controller, semiconductor analyzer. (a) MDM; (b) Electromagnet; (c) Cryostat; (d) Temperature controller; (e) Semiconductor analyzer.
Figure 3.
Figure 3.
The I–V curve for gold-DNA-gold structure in presence of various magnetic fields at room temperature. The subfigure shows I–V curve of the junction between the two electrodes in absence of DNA molecules.
Figure 4.
Figure 4.
The magnitude of current in constant voltages of in several magnetic fields.
Figure 5.
Figure 5.
I(B=0)-I(B) via voltage in the presence of various magnetic field for gold-DNA-gold structure.
Figure 6.
Figure 6.
Saturation current versus magnetic field in gold-DNA-gold structure.
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