| Title | Elucidation of the unsymmetrical effect on the piezoelectric and semiconducting properties of Cd-doped 1D-ZnO nanorods |
| Author | Yuvasree Purusothaman,a Nagamalleswara Rao Alluri,b Arunkumar Chandrasekhara and Sang-Jae Kim*a |
| Affiliation(s) | a Nanomaterials and System Lab, Department of Mechatronics Engineering, Jeju National University, Jeju 690-756, Republic of Korea E-mail: kimsangj@jejunu.ac.kr Fax: +82-64-756-3886
Tel: +82-64-754-3715
b Faculty of Applied Energy System, Department of Mechanical Engineering, Jeju National University, Jeju 690-756, Republic of Korea |
| Published | J. Mater. Chem 06 Dec 2016 DOI: 10.1039/C6TC04592H |
| Keyword | multi-wavelength LED |
| Snippet | ... The photo-responsive IV measurements were recorded using a semiconductor device parameter
analyzer (Agilent-B1500A) with the help of a Prizmatix multi-wavelength LED light source operated
at wavelengths of 365 nm, 405 nm and 535 nm at different intensities. ... |
| Abstract | Herein, we report the unsymmetric effect on the functional (piezoelectric and semiconducting) properties of cadmium-doped 1D-ZnO nanorods (NRs), which have a higher ionic radius (0.97 Å). The growth of Cd-ZnO NRs, which have a hexagonal wurtzite structure without any secondary CdO phases, along the c-axis was confirmed by the XRD patterns, and oxidation states observed from XPS analyses verified the diffusion of Cd2+ into ZnO NRs. A one-fold reduction in the piezoelectric properties was determined by the fabrication of a nanogenerator, and enhancement in the semiconducting properties was studied using an Ag/Cd-ZnO NRs/Ag device with various wt% of Cd doped into the ZnO NRs lattice. Cd-ZnO NRs improve the photogenerated charge carriers (Iph ∼ 330 μA) compared to pure ZnO NRs (Iph ∼ 213 μA), obtained at a bias voltage of 10 V, a wavelength of 365 nm and a light intensity of 8 mW cm−2. The Cd-ZnO NRs (1 wt%) based sensor shows good photoresponse with a detectivity (D*) limit of 1 × 1011 cm H1/2 W−1 compared to that of pure ZnO NRs (D* = 5.4 × 1010 cm H1/2 W−1). We also demonstrate a self-powered UV sensor (SPUV-S) connected parallel to the ZnO NRs based nanogenerator as an independent power source to drive the Cd-ZnO NRs UV sensor. The low-temperature hydrothermal synthesis of Cd-ZnO NRs is simple, cost-effective, and scalable for industrial applications. |
