Seed-Mediated Synthesis and Photoelectric Properties of Selenium Doped Zinc Oxide Nanorods

Abstract

Pristine ZnO and selenium doped ZnO (Se-ZnO) nanorods were successfully synthesized using seed-mediated hydrothermal method. The growth solution of both pure and Se-doped ZnO nanorods employed zinc nitrate hexahydrate (ZNH) and hexamethylenetetramine (HMT) as a precursor and surfactant, respectively. As a dopant source, selenium salt solution was obtained by reacting selenium powder with sodium borohydride at low temperature. The as-prepared pure ZnO and Se-doped ZnO nanorods were characterized using field effect scanning electron microscopy (FESEM), X-ray diffraction (XRD), UV-Visible spectroscopy (UV-Vis), and Photoluminescence (PL) spectroscopy. FESEM images show that the geometric shape of Se-ZnO nanoparticles is nanorods with a hexagonal cross-section. The XRD pattern shows the diffraction peak of the sample at the angles of 2θ: 34.44°, 36.25° and 47.54° which represents the hkl plane of (002), (101) and (102), respectively. The crystalline size calculated from XRD data is found to be in the range of 35-42 nm. The UV-Vis spectrum shows that Se-ZnO nanorods strong absorption peaks appeared in the range of 300-380 nm for all samples. Se doping has slightly altered the band gap energy of pure ZnO nanorods around 0.01 eV. The peak of the photoluminescence spectra of the sample at 470 nm indicates the blue emission band.

Annealing temperature effects on the size and band gap of ZnS quantum dots fabricated by co-precipitation technique without capping agent

“…Generally, the particles size, structural and optical properties of ZnS nanopowders were found to be sensitively dependent on the annealing temperature. Similar variations in E G was also observed on other nanoparticle systems such as ZnSe thin films 29 , ZnO nanorods 37 and ZnS doped Au, Mn and Ga 38 .

Figure 7 The optical band gap ( E G ) and particles size ( P ) calculated from E G for non-annealed and annealed ZnS QDs.

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Effect of Hexamethylenetetramine of Zinc Oxide Nanowires Using Chemical Bath Deposition Method

“…In Figure 3, the dominant peak is observed at 2 θ = 36.25°, indicating preferential growth along the (101) crystal plane. [ 24,25 ] Other prominent peaks are observed in the (100) and (002) crystal planes. XRD analysis confirmed that the ZnO nanorods are grown on substrates with different [Zn (NO 3 ) 2 ]: [HMTA] ratios promoted the growth of crystal structures with crystal plane orientations of (101) and (100), which belong to the hexagonal wurtzite structure.…”

Photocatalytic Studies on Zinc Oxide Nanoparticles Doped with Selenium and Silicon Dioxides for Photodegradation of Lasix Drug

“…The oxides of the p block elements were opted to dope so that the doping will activate the hole-pair movements during photo catalysis of ZnO [5][6][7][8][9] . ZnO doped with selenium also have photoelectronic properties and contribute to the crystallite size [10][11] . ZnO with dopants from pblock elements Selenium and Silicon were synthesised as nanoparticles and their photocatalytic activities were compared on degradation of furosemide drug.…”