Nazarudin, Nur Fatin Farhanah and Rizan, Nastaran and Periasamy, Vengadesh and Rahman, Saadah Abdul and Goh, Boon Tong (2019) Physical, optical and electrical studies on hybrid Ag NPs/NiSi NWs electrode as a DNA template for biosensor. Materials Research Express, 6 (9). 095039. ISSN 2053-1591, DOI https://doi.org/10.1088/2053-1591/ab2e88.
Full text not available from this repository.Abstract
By means of Chemical Vapor Deposition (CVD), Nickel silicide nanowires (NiSi NWs) were grown on silica substrate followed by a solid-diffusion controlled growth mechanism at different substrate temperatures ranging from 400 to 520 °C. The NWs were then subsequently decorated with Ag nanoparticles (Ag NPs) via a simple thermal evaporation technique. The morphologies of the NiSi NWs and Ag NPs/NiSi NWs showed noticeable dependence on the growth substrate temperatures. NiSi NWs grown at 470 °C exhibited the highest NW density with a uniform decoration of spherical Ag NPs of ∼13.7 ± 1.5 nm of diameter. The Ag NPs/NiSi NWs appeared to exhibit a better crystallinity compared to the as-grown NiSi NWs, which could be attributed to metal induced crystallization. Moreover, the decoration of Ag NPs on NiSi NWs showed a significant enhancement in Raman peak intensities mainly in the Ni2Si, NiSi, and NiSi2 phases. The Ag NPs/NiSi NWs demonstrated a well-defined surface plasmon resonance absorption bands centered at around 420 nm, which elucidate the effectiveness of the decoration of Ag NPs on NiSi NW surfaces with a thin amorphous dielectric barrier layer. Using current-voltage (I-V) measurement, Ag NPs/NiSi NWs and NiSi NWs shown to exhibit a surface type Schottky diode with rectifying behavior. The values of ideality factor for the NiSi NWs and Ag NPs/NiSi NWs Schottky diodes were calculated to be 6.992 and 2.559 respectively. Additionally, the values of series resistances were also calculated , where the series resistance obtained are 91.856 and 38.697 kΩ for NiSi NWs and Ag NPs/NiSi NWs DNA electrodes, respectively. © 2019 IOP Publishing Ltd.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Uncontrolled Keywords: | Amorphous dielectrics; Chemical vapor depositions (CVD); Current-voltage measurements; Different substrates; Metal-induced crystallization; Rectifying behaviors; Surface plasmon resonance absorption; Thermal evaporation technique |
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics |
| Divisions: | Faculty of Science > Department of Physics |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 20 Feb 2020 02:49 |
| Last Modified: | 20 Feb 2020 02:49 |
| URI: | http://eprints.um.edu.my/id/eprint/23869 |
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