Synthesis and Optical Properties of Dithiol-Linked ZnO/Gold Nanoparticle Composites

Im, Jisun; Singh, Jagdeep; Soares, Jason W.; Steeves, Diane M.; Whitten, James E.

doi:10.1021/jp202461f

Cited by 53 publications

(53 citation statements)

References 52 publications

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“…Several possible reasons may be responsible for the improved performance of the sensor based on Au/F-ZnO. First, the highly distributed catalytic Au NPs on the flowerlike ZnO nanostructure could promote the ion adsorption of oxygen species (O À , O 2 À and O 2À ) due to the well-known spillover effect [28][29][30], which is beneficial for promoting the gas sensor performance. Second, the Au NPs possess a strong charge storage function and act as a strong acceptor of electrons [31][32][33], which can induce an enlarged surface space charge layer and further resulting in the depletion of electrons near the interface (shown in Fig.…”

Section: Gas Sensing Propertiesmentioning

confidence: 99%

Au nanoparticle modified flower-like ZnO structures with their enhanced properties for gas sensing

Tian

Guo

2014

Materials Science in Semiconductor Processing

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Section: Gas Sensing Propertiesmentioning

confidence: 99%

Au nanoparticle modified flower-like ZnO structures with their enhanced properties for gas sensing

Tian

Guo

2014

Materials Science in Semiconductor Processing

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“…Therefore, the synergetic combination with other materials has been intensively investigated due to the possibility of the modulation of their properties [21]. The research on the modification of semiconductors with noble metal ions, for instance, as is the case of silver or gold, has gained a significant interest in different areas like photocatalysis, sensing, surface-enhanced Raman or biomedicine, showing very remarkable prospects [21][22][23]. For instance, one of the most important limitations of the ZnO nanostructures in photocaltalytic or photovoltaic applications is the high recombination rate of photoinduced charge carriers.…”

Section: Introductionmentioning

confidence: 99%

One-step synthesis of ZnO decorated CNT buckypaper composites and their optical and electrical properties

Rodrigues

Mata

Pimentel

et al. 2015

Materials Science and Engineering: B

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a b s t r a c tZnO/CNT composites were prepared using ZnO nanoparticles and tetrapods synthesized by the Laser Assisted Flow Deposition method. The co-operative behaviour between these two materials may give rise to the production of advanced functional materials with a wide range of applications in electronics and optoelectronics. Despite some degree of aggregation in the case of the nanoparticles, scanning electron microscopy images evidence that the produced ZnO structures are well dispersed in the CNT buckypapers. Independent of the ZnO morphology the samples resistivity was shown to be of the order of ∼10 −1 cm while in the case of the electron mobility, the composite with tetrapods reveals a lower value than the ones obtained for the remaining samples. Well-structured ZnO luminescence was observed mainly in ultraviolet highlighting the high optical quality of the produced structures. The temperature dependence of the luminescence reveals a distinct trend for the composites with ZnO tetrapods and ZnO nanoparticles.

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“…However, Ag is considered to have a low solubility in ZnO at equilibrium conditions, since the Ag ion has a different valence state than ZnO and a larger ionic radius, so diffusion of the Ag to the surface of the ZnO is frequently observed 25 . The production of this type of ZnO/metal composites usually involves procedures as calcination, sputter or electrophoretic deposition of metals in the ZnO surfaces 18 . In most of these cases several steps are needed in order to produce the composites.…”

Section: Introductionmentioning

confidence: 99%

ZnO micro/nanocrystals grown by laser assisted flow deposition

et al. 2014

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Laser assisted flow deposition (LAFD) is a very high yield method based on a vapor-solid mechanism, allowing the production of ZnO crystals in a very short time. The LAFD was used in the growth of different morphologies (nanoparticles, tetrapods and microrods) of ZnO micro/nanocrystals and their microstructural characterization confirms the excellent crystallinity of the wurtzite structure. The optical properties of the as-grown ZnO crystals investigated by low temperature photoluminescence (PL) evidence a well-structured near band edge emission (NBE) due to the recombination of free (FX), surface (SX) and donor bound (D 0 X) excitons. Among the most representative emission lines, the 3.31 eV transition was found to occur in the stacking faults-free microrods. The luminescence behavior observed in H passivated samples suggests a closer relationship between this optical center and the presence of surface states.Besides the unintentionally doped micro/nanocrystals, ZnO/Ag and ZnO/carbon nanotubes (CNT) hybrid structures were processed by LAFD. The former aims at the incorporation of silver as a p-type dopant and the latter envisaging photovoltaic applications. Silver-related spherical particles were found to be inhomogeneously distributed at the microrods surface, accumulating at the rods tips and promoting the ZnO nanorods re-nucleation. Despite the fact that energy dispersive X-ray measurements suggest that a fraction of the silver could be incorporated in the ZnO rods, no new related luminescence lines or bands were observed when compared with the as-grown samples. For the case of the ZnO/CNT composites two main approaches were adopted: i) a direct deposition of ZnO particles on the surface of vertically aligned multi-walled carbon nanotubes (VACNTs) forests without employing any additional catalyst and ii) new ZnO/CNT hybrids were developed as buckypaper nanocomposites. The use of the LAFD technique in the first approach preserves the CNTs structure and alignment and avoids the collapse of the VACNTs array, which is a major advantage of this method. On the other hand, LAFD grown ZnO nanoparticles and tetrapods were used to produce ZnO/CNT buckypaper nanocomposites. When compared with the as-grown samples the PL spectra of the composites structures behave differently. For the case of the ZnO/VACNTs no changes on the peak position and spectral shape were observed. Only an enhancement of the overall luminescence was found to occur. On contrary, for the buckypaper nanocomposites notable changes on the spectral shape and peak position were observed, likely due to distinct surface band bending effects for the ZnO nanoparticles and tetrapods embedded in the CNTs.

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Synthesis and Optical Properties of Dithiol-Linked ZnO/Gold Nanoparticle Composites

Cited by 53 publications

References 52 publications

Au nanoparticle modified flower-like ZnO structures with their enhanced properties for gas sensing

Au nanoparticle modified flower-like ZnO structures with their enhanced properties for gas sensing

One-step synthesis of ZnO decorated CNT buckypaper composites and their optical and electrical properties

ZnO micro/nanocrystals grown by laser assisted flow deposition

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