Chiral Carbonaceous Nanotubes Modified with Titania Nanocrystals: Plasmon‐Free and Recyclable SERS Sensitivity

Qiu, Bocheng; Xing, Mingyang; Yi, Qiuying; Zhang, Jinlong

doi:10.1002/anie.201505319

Cited by 76 publications

(52 citation statements)

References 30 publications

(21 reference statements)

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“…Although the EM-based noble-metal substrates show superior enhancement factors (EFs) of 10 6 or higher, they inevitably suffer from poor biocompatibility, nearly immobilized band structure, excessive cost and so on. In addition to noble-metals, SERS has also been found in semiconductors [18][19][20][21][22], metal-organic frameworks (MOFs) [23] and amorphous materials [24,25], in which Raman enhancement is thought to be the chemical mechanism (CM) caused by the charge-transfer between the analytes and the substrates. Particularly interesting is the recent discovery of SERS activity in conductive polymer films [26].…”

Section: Introductionmentioning

confidence: 99%

Remarkable surface-enhanced Raman scattering of highly crystalline monolayer Ti3C2 nanosheets

Liu

et al. 2020

Sci. China Mater.

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As a powerful non-destructive and label-free detection technology, surface-enhanced Raman scattering (SERS) has been widely used in environmental-pollutant detection, biological-tissue sensing, molecular fingerprint analysis and so on. Different from the traditional SERS substrates represented by noble metals and semiconductors, herein, we report a new highly sensitive SERS substrate material with high stability, biocompatibility, and low cost, namely nucleusfree two-dimensional electron gas (2DEG) Ti 3 C 2 monolayer nanosheets. The highly crystalline monolayer Ti 3 C 2 nanosheets with clean surface are synthesized by an improved chemical exfoliation and microwave heating method. The unique structure of nucleus-free-2DEG in Ti 3 C 2 monolayer provides an ideal transport channel without nuclear scattering, which makes the highly crystalline monolayer Ti 3 C 2 nanosheets achieve a Raman enhanced factor of 3.82×10 8 and a 10 −11 level detection limit for typical environmental pollutants such as azo dyes, trichlorophenol, and bisphenol A. Singlemolecule imaging is also realized on the surface of the Ti 3 C 2 monolayers, which may be the first time that approximate single-molecule imaging has been achieved on a non-noblemetal SERS substrates. Preliminary toxicological experiments show that the cytotoxicity of this material is very low. Considering the facile synthesis, high biocompatibility, low cost and high chemical stability of carbide nanosheets, these Ti 3 C 2 monolayer nanosheets show significant promise for the design and fabrication of flexible SERS substrates for the sensing of trace substances with ultrahigh sensitivity.

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Section: Introductionmentioning

confidence: 99%

Remarkable surface-enhanced Raman scattering of highly crystalline monolayer Ti3C2 nanosheets

Liu

et al. 2020

Sci. China Mater.

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“…Based on the requirement of the increasing energy and environmental-related concerns, photocatalystic technology, which is a light-driven photochemical process over the surface of the photocatalysts and were firstly proposed to producing hydrogen from water, has attracted widely attentions due to its potential applications in the fields of waste water purification, water splitting to hydrogen, biological sensors, solar energy cell, etc 1 2 3 4 . Although the photocatalysis is over-exploited in the past decades, there are still some challenges in this field, such as increasing of the reaction efficiency, inhibiting of the recombination of the photo-generated electrons and holes, even the electrons and holes transport mechanism, etc.…”

mentioning

confidence: 99%

Hydrothermal etching fabrication of TiO2@graphene hollow structures: mutually independent exposed {001} and {101} facets nanocrystals and its synergistic photocaltalytic effects

Liu

Zhang

et al. 2016

Sci Rep

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Highly exposed facets TiO2 attracts enormous attention due to its excellent separation effect of photogenerated electron-hole pairs and induced high performance of photocatalytic activity. Herein, a novel hydrothermal etching reaction was used to synthesize graphene-wrapped TiO2 hollow core-shell structures. Different with the reported co-exposed facets TiO2 single crystal nanoparticles, the present TiO2 core layer is composed by the mutually independent exposed {001} and {101} facets nanocrystals. Combined with the reduced graphene oxide shell layer, this graphene-wrapped TiO2 hollow core-shell structures formed a Z-scheme photocatalytic system, which possess simultaneously the high charge-separation efficiency and strong redox ability. Additionally, the as-prepared samples show a higher absorption property for organic molecules and visible light due to the presence of graphene. All of these unique properties ensure the excellent photocatalytic activity for the graphene-wrapped TiO2 hollow structures in the synergistic photo-oxidation of organic molecules and photo-reduced of Cr(VI) process. The TiO2 core composed with mutually independent exposed {001} and {101} facets nanocrystals is propose to play an important role in the fabrication of this Z-scheme photocatalytic system. Fabrication of Z-scheme photocatalytic system based on this unique exposed facets TiO2 nanocrystals will provides a new insight into the design and fabrication of advanced photocatalytic materials.

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“…Similarly, we recently reported that chiral carbonaceous nanotube (CNT)–TiO 2 hybrids can be used as SERS‐active substrates. In the helical structure, the optical Kerr effect can take place and the birefringence phenomenon occurs under laser irradiation, affording more opportunities for Raman scattering, which can be responsible for the high SERS sensitivity (Figure c) . The introduction of TiO 2 nanoparticles provides a self‐cleaning platform due to their excellent photocatalytic activity.…”

Section: Design Strategies For Improving Sers Activity Of Noble‐metamentioning

confidence: 99%

Noble‐Metal‐Free Materials for Surface‐Enhanced Raman Spectroscopy Detection

Tan

Melkersson

et al. 2016

ChemPhysChem

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Surface-enhanced Raman spectroscopy (SERS) is an attractive tool for the sensing of molecules in the fields of chemical and biochemical analysis as it enables the sensitive detection of molecular fingerprint information even at the single-molecule level. In addition to traditional coinage metals in SERS analysis, recent research on noble-metal-free materials has also yielded highly sensitive SERS activity. This Minireview presents the recent development of noble-metal-free materials as SERS substrates and their potential applications, especially semiconductors and emerging graphene-based nanostructures. Rather than providing an exhaustive review of this field, possible contributions from semiconductor substrates, characteristics of graphene enhanced Raman scattering, as well as effect factors such as surface plasmon resonance, structure and defects of the nanostructures that are considered essential for SERS activity are emphasized. The intention is to illustrate, through these examples, that the promise of noble-metal-free materials for enhancing detection sensitivity can further fuel the development of SERS-related applications.

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Chiral Carbonaceous Nanotubes Modified with Titania Nanocrystals: Plasmon‐Free and Recyclable SERS Sensitivity

Cited by 76 publications

References 30 publications

Remarkable surface-enhanced Raman scattering of highly crystalline monolayer Ti3C2 nanosheets

Remarkable surface-enhanced Raman scattering of highly crystalline monolayer Ti3C2 nanosheets

Hydrothermal etching fabrication of TiO2@graphene hollow structures: mutually independent exposed {001} and {101} facets nanocrystals and its synergistic photocaltalytic effects

Noble‐Metal‐Free Materials for Surface‐Enhanced Raman Spectroscopy Detection

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