Hydrophilicity Reinforced Adhesion of Anodic Alumina Oxide Template Films to Conducting Substrates for Facile Fabrication of Highly Ordered Nanorod Arrays

Wang, Chuanju; Wang, Guiqiang; Yang, Rui; Sun, Xianwen; Ma, Hui; Sun, Shuqing

doi:10.1021/acs.langmuir.6b03999

Cited by 20 publications

(21 citation statements)

References 46 publications

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“…These interstitial plasmon gaps less than ±2.14 (±0.679) nm can act as hot sites for the protrusion of probe molecules to exhibit enhanced vibrational signatures in the SERS spectra. In this connection, it may be emphasized that such small and controlled interstitial gap plasmons are unique in nature and are not achievable from any other soft lithographic techniques or even with the aid of anodic aluminum oxide (AAO) templates . This can only be accomplished through the LB technique.…”

Section: Resultsmentioning

confidence: 99%

Infused self‐assembly on Langmuir–Blodgett Film: Fabrication of highly efficient SERS active substrates with controlled plasmonic aggregates

Saha

Ghosh

Chowdhury

2018

J Raman Spectroscopy

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A facile procedure towards the fabrication of highly reproducible, large area surface-enhanced Raman scattering (SERS) active substrates through integration of Langmuir-Blodgett and self-assembly technique has been reported. The plasmonic architectures of the substrates can be tuned at will to control the hot spots and hence the overall enhancements of SERS signal. The asprepared substrates of classes "A" and "B" incubated in gold nanocolloids show their respective efficacies as efficient SERS sensing scaffolds for detecting 4-MPy molecule at ultrasensitive concentrations. Moreover, these substrates are unique in their kinds, where explicit or concomitant presence of protonated and deprotonated forms of 4-MPy can be detected at trace concentrations. The substrates also exhibit remarkable spectral reproducibility and show early promise to overcome the "SERS uncertainty principle". To our knowledge, this genre of SERS active substrates with facile control over plasmonics, is the first report of its kind and are expected to provide new direction towards successful fabrication of the next generation SERS sensing platforms.

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Section: Resultsmentioning

confidence: 99%

Infused self‐assembly on Langmuir–Blodgett Film: Fabrication of highly efficient SERS active substrates with controlled plasmonic aggregates

Saha

Ghosh

Chowdhury

2018

J Raman Spectroscopy

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“…The lateral etching process was performed using a two-electrode cell with the GaN sample as the anode and a platinum sheet as the cathode, anodized at 10 V for 120 min. The details can be found elsewhere. , After the removal of the SiO 2 layer (Figure b), a 300 nm thick anodic aluminum oxide (AAO) membrane was transferred onto the laterally porous GaN , as a dry etching mask (Figure c). During the AAO transfer process, a polymethyl methacrylate film was used as a flexible holder to support the AAO membrane, and it was dissolved in an acetone bath after transferring.…”

Section: Methodsmentioning

confidence: 99%

Light Modulation and Water Splitting Enhancement Using a Composite Porous GaN Structure

Yang

et al. 2018

ACS Appl. Mater. Interfaces

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On the basis of the laterally porous GaN, we designed and fabricated a composite porous GaN structure with both well-ordered lateral and vertical holes. Compared to the plane GaN, the composite porous GaN structure with the combination of the vertical holes can help to reduce UV reflectance and increase the saturation photocurrent during water splitting by a factor of ∼4.5. Furthermore, we investigated the underlying mechanism for the enhancement of the water splitting performance using a finite-difference time-domain method. The results show that the well-ordered vertical holes can not only help to open the embedded pore channels to the electrolyte at both sides and reduce the migration distance of the gas bubbles during the water splitting reactions but also help to modulate the light field. Using this composite porous GaN structure, most of the incident light can be modulated and trapped into the nanoholes, and thus the electric fields localized in the lateral pores can increase dramatically as a result of the strong optical coupling. Our findings pave a new way to develop GaN photoelectrodes for highly efficient solar water splitting.

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“…Comparatively, electrochemical growth of nanodots or metal nanowires require much less time duration, hence, these structures are the one that are being often reported in the literatures till date. 28,35,39,58 In the current work, dense hyperbranching observed in the electrochemically grown CdTe through the non-uniform PA template can provide a complete new aspect toward optoelectronic applications. Moreover, the overall duration for fabrication of 3D CdTe structures is only 2.5 hours (including the fabrication time of PA template), as compared to more than 32 hours reported elsewhere.…”

Section: Discussionmentioning

confidence: 87%

“…Some major modifications and thus significant improvements have been incorporated in comparison to the already reported literatures on transfer and adhesion of PA membrane to enable the growth of high aspect ratio, vertically standing CdTe nanowires on FTO coated glass. 33,35,39 …”

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confidence: 99%

Controlled and Selective Growth of 1D and 3D CdTe Nanostructures through a Structurally Engineered Porous Alumina Template for Enhanced Optical Applications

Bindra

John

Roy

et al. 2017

J. Electrochem. Soc.

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Current manuscript describes porous alumina (PA) template assisted electrodeposition of high aspect ratio nanowires and dense hierarchical structures of CdTe. We demonstrate here for the first time that simple structural engineering of a PA template can lead to electrochemical growth of diverse shapes of CdTe nanostructures. Facile and cost-effective modifications have been implemented for the fabrication of self-organized through-hole PA membrane and its transfer onto any rough substrate. These modifications have facilitated extended duration (30 minute to 1 hour) electrodeposition of CdTe nanostructures at high bath temperature of 60 • C without delaminating the PA membrane. High aspect ratio nanowires of 60 nm diameter and 2.8 μm length were growth through the self-ordered PA membrane without any underlying metal coating i.e. without altering its optical properties. An average of 56% optical absorption (within 350 nm -1400 nm wavelength) and a moderate photoluminescence was observed for the CdTe nanowires. Minor variation in the anodization process resulted into a non-uniform/branched PA template that enabled the formation of dense 3D hierarchical structures of CdTe using similar electrodeposition conditions as that used for CdTe nanowires. The hierarchical CdTe nanostructures exhibited very high total optical absorption of ∼90% within 350 nm -1400 nm wavelength and a strong photoluminescence was also demonstrated that was almost 10 fold more intense than the CdTe nanowires. CdTe, CdS, CdSe are well established II-VI periodic group optically active chalcogenide semiconductor materials with immense applications in optoelectronic, photonics and bio-labelling applications. Intervention of Nanoscience and Nanotechnology has enabled realization of low dimensional nanostructures of Cadmium chalcogenides (CdS, CdSe, or CdTe) with enhanced surface area to volume ratio that have attracted major appreciation with their unique and enhanced electronic and optical properties.1-3 Specifically, 1D Cadmium chalcogenide nanowires/nanorods have demonstrated highperformance optoelectronic applications such as optical waveguides, lasers, photoluminescence, photodetectors (visible, NIR), solar cells, etc. [4][5][6][7][8][9][10][11][12][13][14][15] It is realized that a precise control over the size and the structure of nanostructures enables vast tuning of the energy band gaps and generates unique optical properties.16 Unlike 2D structures, nanowires can accommodate large amount of mismatch related strain via radial expansion or contraction. It is known that nanowires with high aspect ratio can provide efficient absorption even with smaller depth that can increase the efficacy of photovoltaic devices.17 Especially, CdTe nanowires holds potential for low-cost photovoltaic due to its high absorption coefficient, with a capability of absorbing significant amount of sunlight in a layer thickness of only ∼1 μm, as compared to ∼10 μm for Si. Overall, it is apparent that there has been a major focus onto controlling the structural param...

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Hydrophilicity Reinforced Adhesion of Anodic Alumina Oxide Template Films to Conducting Substrates for Facile Fabrication of Highly Ordered Nanorod Arrays

Cited by 20 publications

References 46 publications

Infused self‐assembly on Langmuir–Blodgett Film: Fabrication of highly efficient SERS active substrates with controlled plasmonic aggregates

Infused self‐assembly on Langmuir–Blodgett Film: Fabrication of highly efficient SERS active substrates with controlled plasmonic aggregates

Light Modulation and Water Splitting Enhancement Using a Composite Porous GaN Structure

Controlled and Selective Growth of 1D and 3D CdTe Nanostructures through a Structurally Engineered Porous Alumina Template for Enhanced Optical Applications

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