A Hybrid Electrochemical/Chemical Synthesis of Zinc Oxide Nanoparticles and Optically Intrinsic Thin Films

Nyffenegger, R.; Craft, B.; Shaaban, M. K.; Gorer, S.; Erley, Georg; Penner, Reginald M.

doi:10.1021/cm970718m

Cited by 132 publications

(88 citation statements)

References 35 publications

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“…However, mixtures of metal oxides are also known to have photocatalytic activity, which in some cases is enhanced, 58 and quantum effects in ZnO have not been observed for particles larger than a few nm. 59,60 In short, it is possible that surface segregation of photocatalysts, such as ZnO, upon exposure to HNO 3 , may contribute to the formation and degradation of important atmospheric species. However, further research is needed to fully understand the role of these semiconductors in such heterogeneous reactions.…”

Section: B Effect Of Nitric Acid On Surfacesmentioning

confidence: 99%

Interactions of gaseous nitric acid with surfaces of environmental interest

Dubowski

Sumner

Menke

et al. 2004

Phys. Chem. Chem. Phys.

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Gaseous nitric acid removal by surfaces in experimental systems and in the atmospheric boundary layer is rapid. However, neither the form of HNO 3 on surfaces nor its impact on the properties of the thin surface film are known. We report here studies of surfaces that have been exposed at room temperature (295 AE 2 K) to gaseous mixtures of water vapor with HNO 3 at concentrations from 46 ppb to 4 Â 10 3 ppm. The surfaces were probed using a combination of Fourier transform infrared spectrometry (FTIR), non-contact atomic force microscopy (AFM), time-of-flight secondary ion mass spectrometry (TOF-SIMS), and X-ray photoelectron spectroscopy (XPS). Exposure of borosilicate glass, quartz, and thin Teflon films to mixtures of gaseous HNO 3 and water vapor leads to the subsequent uptake of much larger amounts of water than occurs on the corresponding unexposed surfaces. Infrared spectra show evidence for the formation of nitric acid-water complexes on the surface that leads to this enhanced water uptake. On borosilicate glass, exposure to the nitric acid-water vapor mixture results in surface segregation of the trace metal oxides and their nitrates formed from reaction with HNO 3 . The majority of these oxides can be removed by rinsing with water; however, smaller, segregated regions of ZnO remain on the surface. The implications for heterogeneous reactions in thin films on surfaces in laboratory systems and in the atmosphere are discussed.

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Section: B Effect Of Nitric Acid On Surfacesmentioning

confidence: 99%

Interactions of gaseous nitric acid with surfaces of environmental interest

Dubowski

Sumner

Menke

et al. 2004

Phys. Chem. Chem. Phys.

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“…24 A PL spectrum for one of their ZnO films is shown in Figure 6a. 29 This spectrum is notable for two reasons.…”

Section: Photoluminescence Spectroscopy Of E/c-synthesized Materialsmentioning

confidence: 99%

Hybrid Electrochemical/Chemical Synthesis of Quantum Dots

Penner

2000

Acc. Chem. Res.

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115

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The "electrochemical/chemical method" (or "E/C method") is a new wet chemical method for synthesizing semiconductor quantum dots on graphite surfaces. The E/C synthesis of quantum dots composed of the generic semiconducting salt, MX, typically involves three steps: (1) electrochemical deposition of nanoparticles of the metal, M°, from a solution of metal ions, M n+ ; (2) electrochemical oxidation of these metal particles to MOn/2, and; (3) displacement of the oxygen from MOn/2 using HX (for example) to yield nanoparticles of MX. This conversion from metal to metal oxide to metal salt occurs on a particle-by-particle basis; that is, each metal nanoparticle is converted into a semiconductor nanoparticle. E/C-synthesized -CuI and CdS quantum dots possess many of the attributes of quantum dots synthesized using molecular beam epitaxy, including epitaxial orientation on the graphite surface, a narrow size dispersion, and strong, particle size-tunable photoluminescence. However, the E/C method is faster, cheaper, and applicable to a greater number of materials.

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“…Doped ZnO materials are of technological importance because of their great potential for applications in optoelectronic devices and luminescent materials [11,12]. Generally, ZnO exhibits two kinds of emissions: one is an ultraviolet (UV) near-band-edge emission at approximately 380 nm and the other a visible deep-level emission with a peak anywhere in the range from 450 to 730 nm [13,14]. The visible emissions are related to intrinsic defects or dopants in the ZnO crystal and depend greatly on the preparation methods and conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mn doping on the structural and optical properties of sol-gel derived ZnO nanoparticles

2012

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Abstract:Un-doped and Mn-doped ZnO nanoparticles were successfully synthesized in an ethanolic solution by using a sol-gel method. Material properties of the samples dependence on preparation conditions and Mn concentrations were investigated while other parameters were controlled to ensure reproducibility. It was observed that the structural properties, particle size, band gap, photoluminescence intensity and wavelength of maximum intensity were influenced by the amount of Mn ions present in the precursor. The XRD spectra for ZnO nanoparticles show the entire peaks corresponding to the various planes of wurtzite ZnO, indicating a single phase. The diffraction peaks of doped samples are slightly shifted to lower angles with an increase in the Mn ion concentration, signifying the expansion of the lattice constants and increase in the band gap of ZnO. All the samples show the absorption in the visible region. The absorbance spectra show that the excitonic absorption peak shifts towards the lower wavelength side with the Mn-doped ZnO nanoparticles. The PL spectra of undoped ZnO consist of UV emission at 388 nm and broad visible emission at 560 nm with varying relative peak intensities. The doping of ZnO with Mn quenches significantly the green emission while UV luminescence is slightly affected. 78.55.-m; 78.67.-n PACS (2008):

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A Hybrid Electrochemical/Chemical Synthesis of Zinc Oxide Nanoparticles and Optically Intrinsic Thin Films

Cited by 132 publications

References 35 publications

Interactions of gaseous nitric acid with surfaces of environmental interest

Interactions of gaseous nitric acid with surfaces of environmental interest

Hybrid Electrochemical/Chemical Synthesis of Quantum Dots

Effect of Mn doping on the structural and optical properties of sol-gel derived ZnO nanoparticles

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