Plasmonic MoO<sub>3−x</sub>@MoO<sub>3</sub> nanosheets for highly sensitive SERS detection through nanoshell-isolated electromagnetic enhancement

Tan, Xianjun; Wang, Lingzhi; Cheng, Chen; Yan, Xuefeng; Shen, Bin; Zhang, Jinlong

doi:10.1039/c5cc10020h

Cited by 175 publications

(183 citation statements)

References 36 publications

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“…The as‐grown MoO 3 nanobelts showed strong wideband optical absorption from UV to NIR wavelength range. As shown in Figure B (a curve), the absorbance was greater than 3.5 cm −1 , which was relatively high, in the NIR wavelengths greater than 800 nm due to the presence of the large amount of oxygen acancies, which is consistent with the previous report . In the visible range (420–800 nm), the absorbance varies from 0.5 to 3.5 cm −1 , whereas in the UV range the absorbance was between 0.5 and 2.2 cm −1 .…”

Section: Resultssupporting

confidence: 90%

Recyclable MoO₃ nanobelts for photocatalytic degradation of Rhodamine B by near infrared irradiation

Zhang

et al. 2018

Int J of Chemical Kinetics

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Molybdenum trioxide (MoO3) represented an excellent photocatalytic performance with many applications, including degradation of organic contaminants and splitting of water. This paper presented a new route to synthesize MoO3 nanobelts with high aspect ratios and crystallinity by a hydrothermal technique. This work showed that the as‐synthesized nanobelts exhibited strong photocatalytic activity to degrade an organic dye of Rhodamine B (RhB) in aqueous solution under the exposure of the light source in the near infrared wavelength range, significantly improving the photocatalytic activity of the nanobelts. The results also showed that for a small concentration of RhB at 7.5 mg/L a complete photodegradation (for a given MoO3 nanobelts quantity of 0.1 g) can be reached after exposing for 60 min. For all concentrations of the RhB solution, the photodegradation exhibited an exponential dependence on the exposure time followed by a sudden shutdown, but no complete photodegradation can be reached. Also, the residual quantity of RhB in solution after the photocatalytic reaction was determined by the initial RhB concentration. The photocatalytic degradation can be interpreted by the pseudo–first‐order equation for the absorption of liquid/solid based on solid capacity; thus, photocatalytic degradation can be attributed to the interaction between the photoexcited electrons in the substrate and the antibonding orbital of the RhB in solution. The sudden shutdown was due to the inability of the photoexcited electrons in the substrate hopping to the antibonding orbital of RhB in the presence of the RhB intermediate products from the degraded RhB. In addition, this work showed that the photocatalytic reaction can be recovered after a thermal treatment of postreacted MoO3 nanobelts, enhancing the utilization efficiency of the catalysis.

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Section: Resultssupporting

confidence: 90%

Recyclable MoO₃ nanobelts for photocatalytic degradation of Rhodamine B by near infrared irradiation

Zhang

et al. 2018

Int J of Chemical Kinetics

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“…From porous ZnO nanosheets, [15] TiO 2 photonic microarrays, [16] CuTe quantum dots, [17] chemically etched ZnSe, [18] and single Cu 2 O superstructure particles [19] to urchin-like W 18 O 49 , [20] MoO 3−x @MoO 3 nanosheets, [21] MoO 3−x quantum dots, [22] and oxygen-incorporating MoS x O y , [23] two types of methods are generally used to improve the SERS performance of semiconductor substrates: morphology design and element doping. As an increasing number of researchers are engaging in the study of semiconductor SERS substrates, research achievements regarding semiconductor SERS substrates have grown exponentially in recent years.…”

Section: Introductionmentioning

confidence: 99%

A Novel Ultra‐Sensitive Semiconductor SERS Substrate Boosted by the Coupled Resonance Effect

et al. 2019

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Recent achievements in semiconductor surface‐enhanced Raman scattering (SERS) substrates have greatly expanded the application of SERS technique in various fields. However, exploring novel ultra‐sensitive semiconductor SERS materials is a high‐priority task. Here, a new semiconductor SERS‐active substrate, Ta 2 O 5 , is developed and an important strategy, the “coupled resonance” effect, is presented, to optimize the SERS performance of semiconductor materials by energy band engineering. The optimized Mo‐doped Ta 2 O 5 substrate exhibits a remarkable SERS sensitivity with an enhancement factor of 2.2 × 10 7 and a very low detection limit of 9 × 10 −9 m for methyl violet (MV) molecules, demonstrating one of the highest sensitivities among those reported for semiconductor SERS substrates. This remarkable enhancement can be attributed to the synergistic resonance enhancement of three components under 532 nm laser excitation: i) MV molecular resonance, ii) photoinduced charge transfer resonance between MV molecules and Ta 2 O 5 nanorods, and iii) electromagnetic enhancement around the “gap” and “tip” of anisotropic Ta 2 O 5 nanorods. Furthermore, it is discovered that the concomitant photoinduced degradation of the probed molecules in the time‐scale of SERS detection is a non‐negligible factor that limits the SERS performance of semiconductors with photocatalytic activity.

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“…The bands appearing at BEs of 234.4 and 231.2 eV can be assigned to the Mo 5+ oxidation band. The presence of Mo 5+ implies increasing electron density, whereas at the same time it can be easily oxidized to higher oxidation states . Moreover, the lower energy level (BE=530.3 eV, Figure d) of O 1s suggests the existence of oxygen vacancies, as reported in other oxygen‐deficient TMOs .…”

Section: Figurementioning

confidence: 62%

Fabrication of a Single‐Atom Platinum Catalyst for the Hydrogen Evolution Reaction: A New Protocol by Utilization of H_xMoO_3−x with Plasmon Resonance

Liu

Yan

et al. 2018

ChemCatChem

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Single‐atom catalysts (SACs) play a key role in many chemical processes owing to highly desirable atom efficiency, but the challenging synthesis of these catalysts limits their commercialization and application on a large scale. Herein, we report a facile strategy to integrate atomic Pt into richly deficient MoO3−x. The core of the experimental strategy was the fabrication and utilization of HxMoO3−x with plasmon resonance that contained intercalated H+. The obtained catalyst was found to possess remarkable electrocatalytic activity toward the hydrogen evolution reaction that was even comparable to that of commercial Pt/C, whereas the amount of Pt used was reduced to only 10 % of the amount of commercial Pt/C used. Therefore, this work not only supplies a new synthesis route to SACs but also reveals the potential relation between plasmon resonance materials and the fabrication of single‐atom catalysts.

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Plasmonic MoO_3−x@MoO₃ nanosheets for highly sensitive SERS detection through nanoshell-isolated electromagnetic enhancement

Cited by 175 publications

References 36 publications

Recyclable MoO₃ nanobelts for photocatalytic degradation of Rhodamine B by near infrared irradiation

Recyclable MoO₃ nanobelts for photocatalytic degradation of Rhodamine B by near infrared irradiation

A Novel Ultra‐Sensitive Semiconductor SERS Substrate Boosted by the Coupled Resonance Effect

Fabrication of a Single‐Atom Platinum Catalyst for the Hydrogen Evolution Reaction: A New Protocol by Utilization of H_xMoO_3−x with Plasmon Resonance

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Plasmonic MoO3−x@MoO3 nanosheets for highly sensitive SERS detection through nanoshell-isolated electromagnetic enhancement

Cited by 175 publications

References 36 publications

Recyclable MoO3 nanobelts for photocatalytic degradation of Rhodamine B by near infrared irradiation

Recyclable MoO3 nanobelts for photocatalytic degradation of Rhodamine B by near infrared irradiation

A Novel Ultra‐Sensitive Semiconductor SERS Substrate Boosted by the Coupled Resonance Effect

Fabrication of a Single‐Atom Platinum Catalyst for the Hydrogen Evolution Reaction: A New Protocol by Utilization of HxMoO3−x with Plasmon Resonance

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Product

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Plasmonic MoO_3−x@MoO₃ nanosheets for highly sensitive SERS detection through nanoshell-isolated electromagnetic enhancement

Recyclable MoO₃ nanobelts for photocatalytic degradation of Rhodamine B by near infrared irradiation

Recyclable MoO₃ nanobelts for photocatalytic degradation of Rhodamine B by near infrared irradiation

Fabrication of a Single‐Atom Platinum Catalyst for the Hydrogen Evolution Reaction: A New Protocol by Utilization of H_xMoO_3−x with Plasmon Resonance