Fabrication of Ag nanostructures with remarkable narrow plasmonic resonances by glancing angle deposition

Abbasian, Sara; Moshaii, Ahmad; Vayghan, Nader Sobhkhiz; Nikkhah, Maryam

doi:10.1016/j.apsusc.2018.02.072

Cited by 16 publications

(13 citation statements)

References 32 publications

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“…Past efforts include using dielectric spacers, made with SiO 2 [9,10] and Al 2 O 3 [11] of con trolled thickness, as well as graphene. [5,[12][13][14] The existing fabrication techniques to realize these strategies often involves multi step microfabrication processes involving expensive patterning techniques such as ebeam lithography, [15,16] nanosphere lithography, [17] nanoimprint lithography [18] or vacuum based deposition [19] techniques.Among various spacer layers, single layer graphene provides an attractive platform due to its atomic layer thickness, broadband photo responsivity and ease of integration over large areas. This was recently demonstrated by Paria et al, [5] who used a graphene monolayer as a separator between 70 nm Ag spheres.…”

mentioning

confidence: 99%

Directed Microwave‐Assisted Self‐Assembly of Au–Graphene–Au Plasmonic Dimers for SERS Applications

Ghosh

Paria

Balasubramanian

et al. 2019

Adv Materials Inter

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photodetection [5,6] and photocatalysis. [7] While random aggregates of silver nano particles can result in very high enhance ment, thereby facilitating the detection of single molecules through Raman scat tering; [8] for technological applications, a greater control and reproducibility over the junction dimensions and therefore enhancements will be necessary. Past efforts include using dielectric spacers, made with SiO 2 [9,10] and Al 2 O 3 [11] of con trolled thickness, as well as graphene. [5,[12][13][14] The existing fabrication techniques to realize these strategies often involves multi step microfabrication processes involving expensive patterning techniques such as ebeam lithography, [15,16] nanosphere lithography, [17] nanoimprint lithography [18] or vacuum based deposition [19] techniques.Among various spacer layers, single layer graphene provides an attractive platform due to its atomic layer thickness, broadband photo responsivity and ease of integration over large areas. This was recently demonstrated by Paria et al., [5] who used a graphene monolayer as a separator between 70 nm Ag spheres. The field enhancement at the junction was calculated to be very large, and this was confirmed through Raman measurements of the graphene layer. In addition, the graphene photoresponsivity was found to be significantly enhanced, and found to be much larger than other plasmonically sensitized graphene photo detectors. [5,6,20,21] Li et al. have developed Cu NPs-graphene-Cu film system by directly depositing Cu nanoparticles on the CVD grown graphene which showed strong nearfield coupling between Cu NPs and Cu films. [22] Enhancement dependence on the laser incident angle was demonstrated and an optimum incident angle of 60° was identified for maximum enhance ment. Similarly, there have been other efforts to use graphene as separators between nanowires, [14] nanodimers, [12,23] photonic nanocrystals, and nanocavities for a multitude of applications. These graphenebased hybrids [13,18,22,24] show excellent Raman signal enhancement and hence have created a new pathway in the field of biosensing through surfaceenhanced Raman spectroscopy.In this paper, we report a new fabrication strategy involving selfassembly that exploits selective heterogenous nucleation to create graphene separated Au dimers. The most important observation is the existence of a window in the growth condi tions that yields preferential heterogeneous nucleation of a Noble metal dimers with sub-nanometer separation support strong electromagnetic field enhancement which has practical applications in surface enhanced Raman scattering (SERS), photodetection, and photocatalysis. Monolayer graphene is an excellent spacer material to practically realize uniform separation between the dimers. Here, directed microwave-assisted self-assembly of Au nanoparticle dimers is reported, separated by graphene monolayer over 1 cm 2 substrates. Detailed analytical models of Au particle formation kinetics explain the experimentally observed control of the density and sel...

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confidence: 99%

Directed Microwave‐Assisted Self‐Assembly of Au–Graphene–Au Plasmonic Dimers for SERS Applications

Ghosh

Paria

Balasubramanian

et al. 2019

Adv Materials Inter

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“…There is also considerable empirical evidence for the cooperation of geometrical structure and wettability gradient in the literature. ,, Various methods such as mask-based, ink-jet printing, and direct deposition have been used to fabricate superhydrophobic/superhydrophilic multigradient surfaces . Among different fabrication methods, direct deposition methods such as physical vapor deposition (PVD) and chemical vapor deposition (CVD) are more interesting due to their simplicity, repeatability, and controllable and homogeneous deposition abilities. , Here, a fast and efficient fog collection system is introduced by incorporating multigradient and multistructure mechanisms inspired by Namib Desert beetles and cactus (Figure ). A wettability gradient has been formed along the acupuncture needle’s azimuthal direction by depositing copper nanocolumns using glancing angle deposition (GLAD).…”

Section: Introductionmentioning

confidence: 99%

“…(a) Setup of the GLAD fabrication system used in this work. , (b) Various segments of an acupuncture needle including tip, body, and tail, in addition to the SEM images of the tip and body of the needle. (c) Schematic of the growth of nanocolumns on the tip of the needle by the GLAD method and cross-sectional field emission SEM (FESEM) images of the Cu nanocolumns on two different points of the needle.…”

Section: Introductionmentioning

confidence: 99%

“…29 Among different fabrication methods, direct deposition methods such as physical vapor deposition (PVD) and chemical vapor deposition (CVD) are more interesting due to their simplicity, repeatability, and controllable and homogeneous deposition abilities. 38,39 Here, a fast and efficient fog collection system is introduced by incorporating multigradient and multistructure mechanisms inspired by Namib Desert beetles and cactus (Figure 1). A wettability gradient has been formed along the acupuncture needle's azimuthal direction by depositing copper nanocolumns using glancing angle deposition (GLAD).…”

Section: Introductionmentioning

confidence: 99%

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Bioinspired Azimuthally Varying Nanoscale Cu Columns on Acupuncture Needles for Fog Collection

Aliabadi

Zarkesh

Siampour

et al. 2021

ACS Appl. Nano Mater.

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Inspired by the natural fog collection of the Namib beetles and desert cacti, a bioinspired design (BID) needle with a remarkable wettability gradient is introduced. Previous studies about directional water transport have rarely investigated wettability gradients along the azimuthal direction of a needle. Here, we have reported on the fast droplet transportation on a BID needle improved by azimuthally varying Cu nanocolumns on a steel acupuncture needle. We have employed glancing angle deposition (GLAD) to produce gradient porous Cu nanocolumns directly on the curved surface of an acupuncture needle. Due to the engineered gradient on such a surface, a high-speed fog collection of V = 134.8 mm·s–1 and a remarkable acceleration of a = 848.3 mm·s–2 were observed for the droplets on the needle surface. All periodically created droplets were easily swept along the 40 mm needle path in less than 0.5 s. Such efficient fog collection and fast droplet transportation in the proposed azimuthally nonuniform structure have many potential applications, from fog collection in low water regions to water transportation in microsystems.

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“…On the other hand, fabrication of nanoparticles by physical vapor deposition (PVD) provides a cost-effective and excellent reproducible method to produce nanoparticles directly on the substrate 31,32 . However, percolation of nanoparticles to form a thin film by increasing deposition thickness and limitation in shape diversity have restricted widespread application of PVD in biosensing 33 .…”

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confidence: 99%

Seed-mediated Electrochemically Developed Au Nanostructures with Boosted Sensing Properties: An Implication for Non-enzymatic Glucose Detection

Siampour

Abbasian

Moshaii

et al. 2020

Sci Rep

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A new approach has been developed to improve sensing performances of electrochemically grown Au nanostructures (AuNSs) based on the pre-seeding of the electrode. The pre-seeding modification is simply carried out by vacuum thermal deposition of 5 nm thin film of Au on the substrate followed by thermal annealing at 500 °C. The electrochemical growth of AuNSs on the pre-seeded substrates leads to impressive electrochemical responses of the electrode owing to the seeding modification. The dependence of the morphology and the electrochemical properties of the AunSs on various deposition potentials and times have been investigated. for the positive potentials, the pre-seeding leads to the growth of porous and hole-possess networks of AunSs on the surface. for the negative potentials, AunSs with carved stone ball shapes are produced. the superior electrode was achieved from AunSs developed at 0.1 V for 900 s with pre-seeding modification. The sensing properties of the superior electrode toward glucose detection show a high sensitivity of 184.9 µA mM −1 cm −2 , with a remarkable detection limit of 0.32 µM and a wide range of linearity. the excellent selectivity and reproducibility of the sensors propose the current approach as a large-scale production route for non-enzymatic glucose detection. During past decades, electrochemical sensing has attracted many attentions due to their considerable advantages such as high sensitivity, low cost, fast response time, wide linear range and portability and widespread applications 1-9. Up to now various types of nanomaterial such as carbon nanotubes 10 , graphene 11,12 , noble metals 13,14 , metal oxides 15 , hybrid 16 and composite nanostructures 17,18 have been developed for electrochemical sensing. Among different nanomaterials, gold nanostructures (AuNSs) have attracted significant interests because of their remarkable electrical and catalytic properties, easy functionalization and excellent biocompatibility. Since the electron transfer and catalytic activity of AuNSs strongly depend on their morphology and their size, extensive researches have been proposed in literatures to develop optimized AuNSs for sensing applications 19,20. The notable approaches between them are based on the electrodeposition 19 , direct electrostatic self-assembly 21 , self-assembly with polymer 22-24 and seed-mediated growth 25-28. In the cases of self-assembly and seed-mediated strategies, the electron transfer and catalytic activity of AuNSs are hindered due to the existence of surfactant and linker molecules surrounding the nanostructures. The electrodeposition is the most reliable approach for shape and size controlled construction of AuNSs due to the possibility of controlling the nucleation and the growth processes. However, in this method the well control of morphology is provided by using template, surfactant or pre-treatment of the substrate that limit the applicability of the method 20,29,30 .

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Fabrication of Ag nanostructures with remarkable narrow plasmonic resonances by glancing angle deposition

Cited by 16 publications

References 32 publications

Directed Microwave‐Assisted Self‐Assembly of Au–Graphene–Au Plasmonic Dimers for SERS Applications

Directed Microwave‐Assisted Self‐Assembly of Au–Graphene–Au Plasmonic Dimers for SERS Applications

Bioinspired Azimuthally Varying Nanoscale Cu Columns on Acupuncture Needles for Fog Collection

Seed-mediated Electrochemically Developed Au Nanostructures with Boosted Sensing Properties: An Implication for Non-enzymatic Glucose Detection

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