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ABSTRACTNovel CuO nanoparticle-capped ZnO nanorods have been produced using a pulsed laser deposition (PLD) method. These nanorods are shown to grow by a CuO-nanoparticle-assisted vapour-solid-solid (V-S-S) mechanism. The photoluminescence (PL) accompanying ultraviolet illumination of these capped nanorod samples shows large variations upon exposure to trace qu… Show more
“…3d. In the figure, there are two peaks located at approximately 934.6 eV and 954.3 eV, corresponds to the Cu 2p 3/2 and Cu 2p 1/2 , respectively, that confirms the Cu 2+ presence on ZnO NRs surface 35, 36 . Additionally, two shake-up satellite peaks for Cu 2p 3/2 and Cu 2p 1/2 were observed at higher binding energy at around 943.2 eV and 962.8 eV, attributed to the partially filled d-block (3d9) of Cu 2+ and hence further confirms the formation of CuO over ZnO NRs surface 36 .Figure 3XPS analysis.…”
There is a major challenge to attach nanostructures on to the electrode surface while retaining their engineered morphology, high surface area, physiochemical features for promising sensing applications. In this study, we have grown vertically-aligned ZnO nanorods (NRs) on fluorine doped tin oxide (FTO) electrodes and decorated with CuO to achieve high-performance non-enzymatic glucose sensor. This unique CuO-ZnO NRs hybrid provides large surface area and an easy substrate penetrable structure facilitating enhanced electrochemical features towards glucose oxidation. As a result, fabricated electrodes exhibit high sensitivity (2961.7 μA mM−1 cm−2), linear range up to 8.45 mM, low limit of detection (0.40 μM), and short response time (<2 s), along with excellent reproducibility, repeatability, stability, selectivity, and applicability for glucose detection in human serum samples. Circumventing, the outstanding performance originating from CuO modified ZnO NRs acts as an efficient electrocatalyst for glucose detection and as well, provides new prospects to biomolecules detecting device fabrication.
“…3d. In the figure, there are two peaks located at approximately 934.6 eV and 954.3 eV, corresponds to the Cu 2p 3/2 and Cu 2p 1/2 , respectively, that confirms the Cu 2+ presence on ZnO NRs surface 35, 36 . Additionally, two shake-up satellite peaks for Cu 2p 3/2 and Cu 2p 1/2 were observed at higher binding energy at around 943.2 eV and 962.8 eV, attributed to the partially filled d-block (3d9) of Cu 2+ and hence further confirms the formation of CuO over ZnO NRs surface 36 .Figure 3XPS analysis.…”
There is a major challenge to attach nanostructures on to the electrode surface while retaining their engineered morphology, high surface area, physiochemical features for promising sensing applications. In this study, we have grown vertically-aligned ZnO nanorods (NRs) on fluorine doped tin oxide (FTO) electrodes and decorated with CuO to achieve high-performance non-enzymatic glucose sensor. This unique CuO-ZnO NRs hybrid provides large surface area and an easy substrate penetrable structure facilitating enhanced electrochemical features towards glucose oxidation. As a result, fabricated electrodes exhibit high sensitivity (2961.7 μA mM−1 cm−2), linear range up to 8.45 mM, low limit of detection (0.40 μM), and short response time (<2 s), along with excellent reproducibility, repeatability, stability, selectivity, and applicability for glucose detection in human serum samples. Circumventing, the outstanding performance originating from CuO modified ZnO NRs acts as an efficient electrocatalyst for glucose detection and as well, provides new prospects to biomolecules detecting device fabrication.
“…[27,38,41] The ordered growth provides obvious advantages over the random growth as demonstrated by the high degree of anisotropic optical properties, such as strong hyperbolic properties. Using the self-assembled Au-BTO film (with ≈10 nm Au pillar diameter) as the buffer layer helps overcome the resolution limitation of the conventional VLS mechanism, that relies on direct Au deposition to control the formation of equilibrium Au clusters or the optical lithography resolution by patterning the substrate with Au structures for ordered ZnO NW growth.…”
spintronics, [2] multiferroics, [3] and quantum systems. [4] Several two-phase nanocomposite systems, exhibiting multilayer or nanowire morphology, have been demonstrated for achieving enhanced physical properties, including ferroelectricity, [5] ferromagnetism, [6] magnetoresistance, [7] and exotic optical properties such as optical magnetism, [8] negative refraction, [9] and hyperbolic dispersion. [10] For example, hyperbolic metamaterials with ordered and anisotropic metal-dielectric nanocomposite designs support the propagation of high wavevectors. [11] Since very few hyperbolic materials exist naturally, this artificially engineered nanocomposite approach provides a multifunctional platform to realize such materials with applications in subdiffraction imaging, [12] sensing, [13] waveguiding, [14] and also offers an opportunity to achieve coupled electric, magnetic, and optical responses. However, due to the availability of a limited range of structures in terms of crystallinity and morphology, a greater design flexibility and a structural complexity along with versatile growth techniques are needed for developing next generation integrated photonic and electronic devices. This can be achieved by incorporating a third phase through the three-phase nanocomposite designs by judicious selection of materials and functionalities.Besides material selection, the spatial ordering of the phases has great impacts on the overall functionalities of nanocomposite materials. Previous efforts to grow ordered ceramicmetal nanocomposites have focused on applying patterning techniques such as anodized alumina oxide (AAO) templates, [15] e-beam lithography, [16] focused ion beam (FIB), [17] and substrate nanotemplate. [18] In contrast, a self-assembly approach for fabricating such ordered oxide-metal nanocomposites is costeffective and overcomes the resolution limitation and complex fabrication steps. Controlled synthesis of such self-assembled complex hybrid nanostructures with desired ordering and epitaxial quality remains a challenge. Specifically, large difference in surface energy, growth kinetics, and high tendency of oxidation and interdiffusion between vastly different phases remains as a major challenge and imposes difficulties in ordering control. Despite the recent success of the self-assembled epitaxial Complex multiphase nanocomposite designs present enormous opportunities for developing next-generation integrated photonic and electronic devices. Here, a unique three-phase nanostructure combining a ferroelectric BaTiO 3 , a wide-bandgap semiconductor of ZnO, and a plasmonic metal of Au toward multifunctionalities is demonstrated. By a novel two-step templated growth, a highly ordered Au-BaTiO 3 -ZnO nanocomposite in a unique "nanoman"-like form, i.e., self-assembled ZnO nanopillars and Au nanopillars in a BaTiO 3 matrix, is realized, and is very different from the random three-phase ones with randomly arranged Au nanoparticles and ZnO nanopillars in the BaTiO 3 matrix. The ordered three-phase "nanoman"-like structu...
“…More seriously, a vertically aligned CuO nanowire array-based sensor is not recoverable when the concentration of H 2 S is higher than 1 ppm [10]. There are some reports to reduce the response/recovery time by incorporating CuO with ZnO to form ZnO-CuO composites (ZnO nanofiber [17], nanowire [18], nanorod [19, 20], hollow sphere [21] decorated with CuO nanoparticles and CuO-ZnO micro/nanoporous film [22]), and ZnO is used as the transducing material in all these cases. Nevertheless, these composite structures could only achieve the detection of H 2 S with a concentration from 500 ppb to 7 ppm.…”
ZnO-CuO mesocrystal was prepared via topotactic transformation using one-step direct annealing of aqueous precursor solution and assembled into a H2S sensor. The ZnO-CuO mesocrystal-based sensor possesses good linearity and high sensitivity in the low-concentration range (10–200 ppb). Compared to pure CuO, the as-prepared ZnO-CuO mesocrystal sensor exhibited superior H2S sensing performance with a response ranging from 8.6 to 152 % towards H2S concentrations from 10 ppb to 10 ppm when applied at the optimized working temperature of 125 °C. The sensor showed excellent repeatability and good selectivity towards H2S gas even at a concentration four orders of magnitude lower than the interfering gases, such as H2, CO2, CO, NO2, acetone, and NH3. The improved sensitivity could be attributed partially to the effective diffusion of analyte gas through the mesocrystal surface and the abundant accessible active sites. Moreover, the nanoscale p-n junctions within the mesocrystal, which could effectively manipulate the local charge carrier concentration, are also beneficial to boost the sensing performance.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-016-1688-y) contains supplementary material, which is available to authorized users.
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