Three-dimensional ordered macroporous nano-architecture and its enhancing effects on Raman detection sensitivity for Eosin Y molecules

Zhang, Wenyan; Jiang, Ziqiu; Lu, Hao; Lü, Gongxuan; Ni, Yaru; Lu, Chunhua; Xu, Zhongzi

doi:10.1016/j.matdes.2017.01.090

Cited by 11 publications

(7 citation statements)

References 43 publications

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“…Furthermore, the as-grown VG is also an effective quencher for other aromatic dyes (chemical structures can be seen in Figure S5) in acquiring their Raman features. As shown in Figure a, Raman features of different dyes, labeled with stars, are in accordance with previous reports. ,,, Similarly, under light irradiation, VG coated with different dyes also exhibits resistance variation (Figure b), which further confirms the quenching mechanism we proposed.…”

Section: Resultssupporting

confidence: 90%

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Vertically Oriented Graphene for the Fluorescence Quenching Raman Spectra of Aromatic Dyes

Huang

Zhang

et al. 2021

J. Phys. Chem. C

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Vertically oriented graphene (VG) is deposited on a wide range of substrates by plasma-enhanced chemical vapor deposition. Moreover, the growth mode of VG is proven to be bottom-up deposition using isotope labeling. The Raman characteristic features of rhodamine 6G (R6G), an aromatic dye, are acquired using VG as a universal fluorescence quencher. The fluorescence quenching mechanism is likely related to the transfer of energy and photon-excited electrons between dye molecules and VG because not only the fluorescence emission spectrum of R6G greatly overlaps with the UV–vis absorption spectrum of VG, but also the resistance of dye-coated VG decreases under light irradiation. In addition, the Raman features of other aromatic dyes, such as eosin Y, rhodamine B, methylene blue, and gallocyanine, are obtained by the same method.

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Section: Resultssupporting

confidence: 90%

“…As shown in Figure 4a, Raman features of different dyes, labeled with stars, are in accordance with previous reports. 1,2,27,28 Similarly, under light irradiation, VG coated with different dyes also exhibits resistance variation (Figure 4b), which further confirms the quenching mechanism we proposed.…”

Section: Resultssupporting

confidence: 83%

Vertically Oriented Graphene for the Fluorescence Quenching Raman Spectra of Aromatic Dyes

Huang

Zhang

et al. 2021

J. Phys. Chem. C

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“…Great efforts have been made to improve the stability of Ag nanostructures by coating an inert shell, such as gold, ,− SiO 2 , TiO 2 , HfO 2 , Al 2 O 3 , and polymers, onto their surface or doping stable element(s) into the Ag lattice. ,− The passivation layer approach normally requires precise control of the layer thickness in the coating process, which induces system complexity as well as a dramatic increase in cost. Additionally, doping of the Ag lattice with stable elements such as titanium and iron, which normally present low electrical conductivity and plasmonic efficiency, remarkably decreases the conductance and sensing sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Nanometer-Thick Al₂O₃ Layers on Ag–Al Nanostructures as Conductive Electrodes

Liu

Yin

Wang

et al. 2021

ACS Appl. Nano Mater.

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Silver (Ag) nanostructures are active functional platforms for catalysts, optical sensors, and transparent conductive networks with outstanding performance but present poor stability depending on their chemical, mechanical, or thermal surroundings. Doping with other elements and passivation with a chemically inert coating of a Ag nanostructure are proven to be efficient in enhancing the stability, while both methods have drawbacks such as cost and sacrifice of the on-demand properties. Here, we present a self-passivated Ag−Al nanostructure with a precisely controlled coating thickness, taking advantage of the intrinsic high conductivity and chemical reducibility of aluminum at the same time, fabricated by oblique angle codeposition of Ag−Al nanostructures followed by postannealing under mild conditions. With the nanometer-thick coating confirmed by transmission electron microscope (TEM) observations, surface-enhanced Raman scattering (SERS) measurements were successfully utilized to further demonstrate the quality of the in situ grown aluminum oxide (Al 2 O 3 ) layer, including the thickness, coating integrity, and chemical stability. In addition, a mechanically robust nanostructure as well as an ultrathin conductive electrode ∼10 nm in thickness was enabled by dilute doping of Al into the Ag matrix. Interestingly, a bipolar change in the Ag−Al/MoS 2 /Ag−Al device after annealing was achieved. Further observation revealed that the Al 2 O 3 layer grew on top of the Ag−Al alloys. The methods we developed require dilute doping of Al into a Ag matrix and mild processing conditions, yet precise interface thickness control and pronounced property enhancement are achieved, all of which pave the way for the practical application of Ag nanostructures in optical sensors and integrated circuits. KEYWORDS: Ag−Al alloy, low-temperature annealing, in situ grown Al 2 O 3 layer, oblique angle deposition, ultrathin conductive electrode

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“…A small peak of rutile phase was also observed at 2θ = 27.44 corresponding to (110) plane due to the high calcination temperature. The diffraction peaks of Ag were not very obvious because the (111) plane of Ag at 2θ = 37.80 were overlapped to the diffraction peaks of biomorphic TiO 2 (004) planes 49 . The diffraction peaks of biomorphic TiO 2 were not disturbed by the deposition of Ag nanoparticles as shown in Fig.…”

Section: Resultsmentioning

confidence: 98%

“…The lower surface area of the biomorphic Ag-TiO 2 was due to the deposition of Ag nano-particles onto the surface of biomorphic TiO 2 . It has been previously shown that lower surface area of the three dimensional Ag-TiO 2 nano-architecture was due to the deposition of Ag nano-particles which covered some mesopores and interstitial space of the TiO 2 network 49 . The average pore diameters and the average pore volumes from the Barrett-Joyner-Halenda (BJH) desorption analysis for biomorphic TiO 2 and Ag-TiO 2 were 7.44 nm, 10.82 nm and 0.070231 cm³/g, 0.076065 cm³/g respectively.…”

Section: Resultsmentioning

confidence: 99%

The highly efficient photocatalytic and light harvesting property of Ag-TiO2 with negative nano-holes structure inspired from cicada wings

Imran

Zhang

Zheng

et al. 2017

Sci Rep

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The negative replica of biomorphic TiO2 with nano-holes structure has been effectively fabricated directly from nano-nipple arrays structure of cicada wings by using a simple, low-cost and highly effective sol-gel ultrasonic method. The nano-holes array structure was well maintained after calcination in air at 500 °C. The Ag nanoparticles (10 nm–25 nm) were homogeneously decorated on the surface and to the side wall of nano-holes structure. It was observed that the biomorphic Ag-TiO2 showed remarkable photocatalytic activity by degradation of methyl blue (MB) under UV-vis light irradiation. The biomorphic Ag-TiO2 with nano-holes structure showed superior photocatalytic activity compared to the biomorphic TiO2 and commercial Degussa P25. This high-performance photocatalytic activity of the biomorphic Ag-TiO2 may be attributed to the nano-holes structure, localized surface plasmon resonance (LSPR) property of the Ag nanoparticles, and enhanced electron-hole separation. Moreover, the biomorphic Ag-TiO2 showed more absorption capability in the visible wavelength range. This work provides a new insight to design such a structure which may lead to a range of novel applications.

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Three-dimensional ordered macroporous nano-architecture and its enhancing effects on Raman detection sensitivity for Eosin Y molecules

Cited by 11 publications

References 43 publications

Vertically Oriented Graphene for the Fluorescence Quenching Raman Spectra of Aromatic Dyes

Vertically Oriented Graphene for the Fluorescence Quenching Raman Spectra of Aromatic Dyes

Nanometer-Thick Al₂O₃ Layers on Ag–Al Nanostructures as Conductive Electrodes

The highly efficient photocatalytic and light harvesting property of Ag-TiO2 with negative nano-holes structure inspired from cicada wings

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Three-dimensional ordered macroporous nano-architecture and its enhancing effects on Raman detection sensitivity for Eosin Y molecules

Cited by 11 publications

References 43 publications

Vertically Oriented Graphene for the Fluorescence Quenching Raman Spectra of Aromatic Dyes

Vertically Oriented Graphene for the Fluorescence Quenching Raman Spectra of Aromatic Dyes

Nanometer-Thick Al2O3 Layers on Ag–Al Nanostructures as Conductive Electrodes

The highly efficient photocatalytic and light harvesting property of Ag-TiO2 with negative nano-holes structure inspired from cicada wings

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Nanometer-Thick Al₂O₃ Layers on Ag–Al Nanostructures as Conductive Electrodes