Facile hot spots assembly on molybdenum oxide nanosheets via in situ decoration with gold nanoparticles

Guo, Yanxian; Zhuang, Zhengfei; Liu, Zhiming; Fan, Wendong; Zhong, Huiqing; Zhang, Wen; Ni, Yirong; Guo, Zhouyi

doi:10.1016/j.apsusc.2019.02.047

Cited by 22 publications

(17 citation statements)

References 43 publications

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“…In Figure 5b, in addition to the two peaks of E 1 2g and A 1g , a tiny peak near 1580 cm −1 was found for the samples deposited at 375 • C and 450 • C, respectively. Combining previous literature [33][34][35] and the results of XRD and EDS (Figures 2 and 3), the appearance of this weak peak is considered to be related to the formation of Mo-O bonds in the films.…”

Section: Structure Of the Filmssupporting

confidence: 65%

Residual Oxygen Effects on the Properties of MoS2 Thin Films Deposited at Different Temperatures by Magnetron Sputtering

Wang

Tan

2021

Crystals

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Molybdenum disulfide (MoS2) thin films were deposited at different temperatures (150 °C, 225 °C, 300 °C, 375 °C, and 450 °C) on quartz glass substrates and silicon substrates using the RF magnetron sputtering method. The influence of deposition temperature on the structural, optical, electrical properties and deposition rate of the obtained thin films was investigated by X-ray diffraction (XRD), Energy Dispersive Spectrometer (EDS), Raman, absorption and transmission spectroscopies, a resistivity-measuring instrument with the four-probe method, and a step profiler. It was found that the MoS2 thin films deposited at the temperatures of 150 °C, 225 °C, and 300 °C were of polycrystalline with a (101) preferred orientation. With increasing deposition temperatures from 150 °C to 300 °C, the crystallization quality of the MoS2 thin films was improved, the Raman vibrational modes were strengthened, the deposition rate decreased, and the optical transmission and bandgap increased. When the deposition temperature increased to above 375 °C, the molecular atoms were partially combined with oxygen atoms to form MoO3 thin film, which caused significant changes in the structural, optical, and electrical properties of the obtained thin films. Therefore, it was necessary to control the deposition temperature and reduce the contamination of oxygen atoms throughout the magnetron sputtering process.

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Section: Structure Of the Filmssupporting

confidence: 65%

Residual Oxygen Effects on the Properties of MoS2 Thin Films Deposited at Different Temperatures by Magnetron Sputtering

Wang

Tan

2021

Crystals

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Section: Functionalization Of 2d Tmos Nanomaterialsmentioning

confidence: 99%

Surface Functionalization of 2D Transition Metal Oxides and Dichalcogenides via Covalent and Non-covalent Bonding for Sustainable Energy and Biomedical Applications

Azadmanjiri

Kumar

Srivastava

et al. 2020

ACS Appl. Nano Mater.

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The interest in two-dimensional (2D) nanomaterials has been increased rapidly after the discovery of graphene. The 2D graphene analogs (2DGAs) with ultrathin-layered feature exhibit a unique property which their bulk counterparts cannot possess. Among various 2D nanomaterials, the transition metal dichalcogenides (TMDs) and transition metal oxides (TMOs) have attracted considerable attention from scientific communities. The availability of various transition metals and their binding states in 2D TMDs and TMOs enable them to show a wide spectrum of properties such as metals to wide band gap semiconductors. Although properties of 2D TMDs and TMOs are excellent, further enhancement of their properties is still required for cutting-edge applications. The surface functionalization of 2DGAs is a potential route for enhancing their properties. The surfaces of 2D TMDs and TMOs could be functionalized with various types of organic or inorganic nanomaterials via covalent or non-covalent interactions. The functionalization may alter the Fermi level of 2D nanomaterials, also having this potential to add extra functionalities to the basis of the fabricated devices using them. In this review, we first introduce and specify the characteristics of 2D TMDs and TMOs as two important 2DGAs. Then, we discuss their limitations and how surface functionalization may enhance their performance. The covalent and non-covalent modes of surface functionalization with organic and inorganic nanomaterials on both 2D TMDs and TMOs are then considered. The current state and challenge of the functionalized 2D TMDs and TMOs are also discussed by their application point of view in energy storage and conversion, sensing, biomedical, catalytic combustion, and (opto)electronic devices.

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“…Effective combination of the electromagnetic and chemical SERS enhancements has been also reported for nanostructured molybdenum oxides decorated with gold nanoparticles [ 50 ]. Although, as mentioned above, nanostructured molybdenum oxides are already an effective SERS substrate, the deposition of gold nanoparticles leads to a further increase in the SERS enhancement factor generated by this material (in this case, by a factor of eight).…”

Section: Non-metallic Nanoparticles Covered By Plasmonic Metalsmentioning

confidence: 99%

Substrates for Surface-Enhanced Raman Scattering Formed on Nanostructured Non-Metallic Materials: Preparation and Characterization

2020

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The efficiency of the generation of Raman spectra by molecules adsorbed on some substrates (or placed at a very close distance to some substrates) may be many orders of magnitude larger than the efficiency of the generation of Raman spectra by molecules that are not adsorbed. This effect is called surface-enhanced Raman scattering (SERS). In the first SERS experiments, nanostructured plasmonic metals have been used as SERS-active materials. Later, other types of SERS-active materials have also been developed. In this review article, various SERS substrates formed on nanostructured non-metallic materials, including non-metallic nanostructured thin films or non-metallic nanoparticles covered by plasmonic metals and SERS-active nanomaterials that do not contain plasmonic metals, are described. Significant advances for many important applications of SERS spectroscopy of substrates based on nanostructured non-metallic materials allow us to predict a large increase in the significance of such nanomaterials in the near future. Some future perspectives on the application of SERS substrates utilizing nanostructured non-metallic materials are also presented.

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Facile hot spots assembly on molybdenum oxide nanosheets via in situ decoration with gold nanoparticles

Cited by 22 publications

References 43 publications

Residual Oxygen Effects on the Properties of MoS2 Thin Films Deposited at Different Temperatures by Magnetron Sputtering

Residual Oxygen Effects on the Properties of MoS2 Thin Films Deposited at Different Temperatures by Magnetron Sputtering

Surface Functionalization of 2D Transition Metal Oxides and Dichalcogenides via Covalent and Non-covalent Bonding for Sustainable Energy and Biomedical Applications

Substrates for Surface-Enhanced Raman Scattering Formed on Nanostructured Non-Metallic Materials: Preparation and Characterization

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