“…Silver was deposited for SERS studies using thermal evaporation from a helical coil onto the CuO nanostructure for a deposition time of 2 min. The film was annealed at 200°C and silver were again deposited; the desired parameter was chosen from the previous publication and resulted in the formation of silver decorated nanoflower like structure [3,20]. The thickness of the deposited silver film was recorded using a quartz crystal thickness monitor.…”
“…Silver was deposited for SERS studies using thermal evaporation from a helical coil onto the CuO nanostructure for a deposition time of 2 min. The film was annealed at 200°C and silver were again deposited; the desired parameter was chosen from the previous publication and resulted in the formation of silver decorated nanoflower like structure [3,20]. The thickness of the deposited silver film was recorded using a quartz crystal thickness monitor.…”
“…ZnO film can be grown by this method using ZnO powder as the evaporation source. Naidu Dhanpal Jayram et al [ 97 ] designed a vertical furnace to synthesize a worm-like Ag@ZnO thin film on a glass substrate through a similar thermal evaporation process. The substrate was at the top of the furnace, the ZnO powder and Ag wires in tungsten coil were at the bottom of the furnace as the evaporation source, and the evaporation was performed by setting up a current.…”
Section: Synthesis Of Zno Nanostructures As Sers Substratesmentioning
confidence: 99%
“…Apart from the photocatalytic performance, the super-hydrophobicity can also be integrated with SERS activity on the ZnO nanostructures. Naidu Dhanpal Jayram et al [ 97 ] successfully prepared super-hydrophobic and high-sensitive worm-like silver-coated ZnO NWs with a contact angle of 163° and an enhancement of 3.082 × 10 7 for detecting 10 −10 M rhodamine 6G (R6G). The super-hydrophobicity was derived from the great increase of the air/water interface when the large fraction of air was entrapped in the interstices of the rough ZnO NWs.…”
Section: Zno Nanostructures For Versatile Sers Applicationmentioning
Since the initial discovery of surface-enhanced Raman scattering (SERS) in the 1970s, it has exhibited a huge potential application in many fields due to its outstanding advantages. Since the ultra-sensitive noble metallic nanostructures have increasingly exposed themselves as having some problems during application, semiconductors have been gradually exploited as one of the critical SERS substrate materials due to their distinctive advantages when compared with noble metals. ZnO is one of the most representative metallic oxide semiconductors with an abundant reserve, various and cost-effective fabrication techniques, as well as special physical and chemical properties. Thanks to the varied morphologies, size-dependent exciton, good chemical stability, a tunable band gap, carrier concentration, and stoichiometry, ZnO nanostructures have the potential to be exploited as SERS substrates. Moreover, other distinctive properties possessed by ZnO such as biocompatibility, photocatcalysis and self-cleaning, and gas- and chemo-sensitivity can be synergistically integrated and exerted with SERS activity to realize the multifunctional potential of ZnO substrates. In this review, we discuss the inevitable development trend of exploiting the potential semiconductor ZnO as a SERS substrate. After clarifying the root cause of the great disparity between the enhancement factor (EF) of noble metals and that of ZnO nanostructures, two specific methods are put forward to improve the SERS activity of ZnO, namely: elemental doping and combination of ZnO with noble metals. Then, we introduce a distinctive advantage of ZnO as SERS substrate and illustrate the necessity of reporting a meaningful average EF. We also summarize some fabrication methods for ZnO nanostructures with varied dimensions (0–3 dimensions). Finally, we present an overview of ZnO nanostructures for the versatile SERS application.
“…Metallic properties of our samples were confirmed by the doublet Ag3d 5/2 and Ag3d 3/2 located at 368.1 eV and 374.1 eV(Fig. 1d), respectively 32, 33 All these results proves that the Ag@Al 2 O 3 nanorods possess the excellent SERS sensitivity and outstanding stability.Figure 1( a ) Top-view SEM image of Ag@Al 2 O 3 nanorods; inset is a corresponding side-view SEM image. ( b ) HRTEM image of the Ag@Al 2 O3 nanorods.…”
Surface-enhanced Raman scattering (SERS) technology combines with chemometric method of principal component analysis (PCA) was used to calculate the composition of chemical mixtures in solution. We reported here that there exists composition discrepancy between molecules in solution and molecules adsorbed on Ag@Al2O3 nanorods substrates due to difference in adsorption kinetics of each component. We proposed here a way to calculate the adsorption kinetics factor for each component using a standard sample as the reference, with which one could correct the predictions given by PCA. We demonstrate the validity of this approach in estimating the compositions of mixtures with two, three and four components of 1, 4-Benzenedithiol, 2-Naphthalenethiol, 4-Mercaptobenzoic acid, and 4-Mercaptopyridine molecules, with acceptable errors. Furthermore, a general formula applied to more complex mixtures was proposed to calculate compositions in solution.
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