Characterization of Ga-doped ZnO Nanorods Synthesized via Microemulsion Method

Lim, Sang Kyoo; Hong, Seong Hui; Hwang, Sung‐Ho; Kim, Soonhyun; Park, Hyunwoong

doi:10.1016/j.jmst.2012.11.005

Cited by 19 publications

(7 citation statements)

References 23 publications

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“…The energy difference between Zn 2p3/2 and Zn 2p1/2 is approximately 23.0 eV, which is close to the standard value of 22.97 eV (Figure S2). 36 However, the binding energy of Zn 2p3/2 was 0.2 eV greater for the plates (1023.0 eV) compared with the rods (1022.8 eV), indicating that in the plates there is a stronger interaction between zinc and oxygen likely due to >Zn−OH or Zn-(OH) 2 . 37 These differences in surface oxygen states affect the photoluminescence (PL) emission spectra of ZnO rods and plates.…”

Section: ■ Introductionmentioning

confidence: 95%

“…36−1451) and no trace of other phases was observed, indicating high phase purity. 35,36 The ZnO sample synthesized from zinc acetate exhibited a strong (101) peak and a relatively weak (002) peak, suggesting preferential growth orientation (i.e., rod type). The ZnO sample synthesized from zinc chloride displayed the same peak distribution, yet the peak intensities (e.g., (101) peak) were weak.…”

Section: ■ Introductionmentioning

confidence: 99%

“…This shape change with different precursors might be attributed to the different degrees of basicity of the precursors. Acetate is a 21,35,36 because of the large grain sizes obtained via the Ostwald ripening process.…”

Section: ■ Introductionmentioning

confidence: 99%

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Shape-Dependent Charge Transfers in Crystalline ZnO Photocatalysts: Rods versus Plates

et al. 2014

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ZnO particles with rod and plate configurations were synthesized using a solvothermal method using zinc acetate and zinc chloride, respectively. The surface of the as-synthesized ZnO rods and plates were characterized using various analysis tools (XRD, XPS, photoluminescence, FE-SEM, HR-TEM, BET, and UV− vis) and their photocatalytic activities were examined for six different redox reactions. The surface areas and bandgaps of the two ZnO samples were nearly identical; however, XPS and photoluminescence (PL) studies showed that the rods and the plates have relatively pronounced oxygen vacancy and oxygen interstitial contributions, respectively. ZnO rods were found to be active for the decomposition of methylene blue and phenol, the production of OH radicals, and the generation of photocurrents, all of which are associated with single-electron transfer reactions. On the other hand, ZnO plates were more effective for the production of molecular hydrogen and hydrogen peroxide, both of which are initiated by two-electron transfer reactions. These single versus multiple charge transfers are discussed with regard to the roles of oxygen vacancies and oxygen interstitials, which are located near the conduction and the valence bands, respectively.

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Section: ■ Introductionmentioning

confidence: 95%

Section: ■ Introductionmentioning

confidence: 99%

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Shape-Dependent Charge Transfers in Crystalline ZnO Photocatalysts: Rods versus Plates

et al. 2014

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“…The XPS results of the sample grown at 90°C are shown in Fig. 3(a), (b) and (c), in which strong signals of Zn 2p, O1s and Ga 2p3 were observed [11]. All XPS spectra were corrected by C 1s peak of carbon at 284.9 eV as reference.…”

Section: Methodsmentioning

confidence: 99%

UV Enhanced Emission Performance of Low Temperature Grown Ga-Doped ZnO Nanorods

Chang

Duan

Hsiao

et al. 2014

IEEE Photon. Technol. Lett.

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We report on hydrothermal growth and gallium doping of ZnO (GZO) nanorods for field emitters. The GZO nanorods grown at 90°C were structurally uniform and well oriented with pure wurtzite structure. It was also found that turn-on fields were 5.4 and 3.6 V/μm while field-enhancement factors β were 1711 and 9058, for the ZnO nanorods and GZO nanorods grown at 90°C, respectively. In addition, the turn-on electrical field was reduced from 3.6 to 3.15 V/μm and β of GZO nanorods was enhanced from 9058 to 13529 by UV illumination.Index Terms-GZO nanorod, field emitters, hydrothermal.

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“…Various techniques have been proposed for the synthesis of ZnO nanomaterials, such as sol-gel [14], hydrothermal [15], precipitation [16], microemulsion [17], electrospinning [18], spray pyrolysis [19], solution combustion synthesis [20][21]. Among these synthesis methods, the solution combustion synthesis (SCS), a redox reaction between an oxidant and a fuel, is self-sustained by its own exothermic reaction in solutions of metal nitrates and different fuels, which have proven to be very efficient and rapid for the synthesis of nanocrystalline ZnO powders.…”

Section: Introductionmentioning

confidence: 99%