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Fabrication of DNA/NiSi NWs and Ag NPs-NiSi NWs-based Schottky diodes for DNA detection with fast response time

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Abstract

In this study, we fabricated deoxyribonucleic acid/nickel silicide nanowires (DNA/NiSi NWs) and DNA-silver nanoparticles decorated NiSi NWs (DNA/Ag NPs-NiSi NWs) Schottky diodes and generated current–voltage (I–V) measurements with response time of 0.08–40 min at room temperature. The results demonstrate significant morphological changes towards both NiSi NWs and Ag NPs-NiSi NWs back contact, attributing to the presence of DNA, which subsequently affected the optical properties of the NWs. On the other hand, the utilisation of Ag NPs decorated NiSi NWs as the back contact yielded a relatively significant Raman spectral fingerprint with an enhanced Raman scattering factor of 1018 when integrated with DNA due to its localised surface plasmon resonance (LSPR) effect in the visible region. The electrical properties for both NWs reacted to DNA against reaction time were calculated and DNA/Ag NPs-NiSi NWs showed better conductivity. The rectifying behaviour of DNA is reflected in the I–V profiles of the hybrid heterostructure DNA/Ag NPs-NiSi NWs diode. The fabricated device demonstrated rectifying behaviours with the turn-on voltage of 0.3 V, ideality factor of 1.4, reverse saturation current of 3.14 × 10−18 A/cm2, and series resistance of 22.47 kΩ. Additionally, the high rectification ratio of 789013.30 demonstrated the higher sensitivity of Ag NPs-NiSi NWs-based Schottky diodes towards DNA than the NiSi NWs diode.

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Acknowledgements

This work was supported by UM Faculty Research Grant (GPF034B-2018) and Fundamental Research Grant Scheme (FP038-2017A).

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  1. Department of Physics, Faculty of Science, Low Dimensional Materials Research Centre (LDMRC), University of Malaya, 50603, Kuala Lumpur, Malaysia

    Nur Fatin Farhanah binti Nazarudin, Nastaran Rizan, Noor Azrina Talik, Vengadesh Periasamy, Saadah Abdul Rahman & Boon Tong Goh

  2. Synchrotron Light Research Institute, Nakhon Ratchasima, 30000, Thailand

    Hideki Nakajima

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  1. Nur Fatin Farhanah binti Nazarudin
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  2. Nastaran Rizan
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  3. Noor Azrina Talik
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  6. Saadah Abdul Rahman
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Correspondence to Nur Fatin Farhanah binti Nazarudin or Boon Tong Goh.

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Nazarudin, N.F.F.b., Rizan, N., Talik, N.A. et al. Fabrication of DNA/NiSi NWs and Ag NPs-NiSi NWs-based Schottky diodes for DNA detection with fast response time. J Mater Sci: Mater Electron 32, 7889–7905 (2021). https://doi.org/10.1007/s10854-021-05513-5

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