Hybrid plasmonic Au–TiN vertically aligned nanocomposites: a nanoscale platform towards tunable optical sensing

Wang, Xuejing; Jian, Jie; Díaz‐Amaya, Susana; Kumah, Cindy E.; Lu, Ping; Huang, Jijie; Lim, Daw Gen; Pol, Vilas G.; Youngblood, Jeffrey P.; Boltasseva, Alexandra; Stanciu, Lia; O’Carroll, Deirdre M.; Zhang, Xinghang; Wang, Haiyan

doi:10.1039/c8na00306h

Cited by 41 publications

(41 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that the PL intensity was collected from three points with comparable perovskite layer thicknesses. Such PL quenching effect was reported in a previous study 32. However, an enhanced PL signal in the nanohole film is observed which is highly correlated to a strong local field enhancement 41.…”

Section: Resultssupporting

confidence: 84%

“…This indicates that a high efficiency nanohole fabrication requires a high‐quality nanocomposite template with continuous and uniform nanopillars. Compared to the structure in our previous report,32 more thorough explorations and careful control of growth parameters have been conducted in this work to improve the ordering and homogeneity. Detailed explorations on growth mechanism and morphological control of two‐phase metal‐nitride nanocomposites are explained in refs.…”

Section: Resultsmentioning

confidence: 99%

“…Details for fabrication can be found in the Experimental Section. Our previous study on Au–TiN VAN serves as the premise for designing the plasmonic nanohole framework 32. Chemical etching was performed by placing droplets of acids on top of the film, parameters such as etchant ratio and condition, treatment time, liquid placement, as well as postcleaning play essential roles in achieving high quality nanoholes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Large‐Scale Plasmonic Hybrid Framework with Built‐In Nanohole Array as Multifunctional Optical Sensing Platforms

Wang

Shi

et al. 2020

Small

Self Cite

View full text Add to dashboard Cite

Light coupling with patterned subwavelength hole arrays induces enhanced transmission supported by the strong surface plasmon mode. In this work, a nanostructured plasmonic framework with vertically built‐in nanohole arrays at deep‐subwavelength scale (6 nm) is demonstrated using a two‐step fabrication method. The nanohole arrays are formed first by the growth of a high‐quality two‐phase (i.e., Au–TiN) vertically aligned nanocomposite template, followed by selective wet‐etching of the metal (Au). Such a plasmonic nanohole film owns high epitaxial quality with large surface coverage and the structure can be tailored as either fully etched or half‐way etched nanoholes via careful control of the etching process. The chemically inert and plasmonic TiN plays a role in maintaining sharp hole boundary and preventing lattice distortion. Optical properties such as enhanced transmittance and anisotropic dielectric function in the visible regime are demonstrated. Numerical simulation suggests an extended surface plasmon mode and strong field enhancement at the hole edges. Two demonstrations, including the enhanced and modulated photoluminescence by surface coupling with 2D perovskite nanoplates and the refractive index sensing by infiltrating immersion liquids, suggest the great potential of such plasmonic nanohole array for reusable surface plasmon‐enhanced sensing applications.

show abstract

Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Large‐Scale Plasmonic Hybrid Framework with Built‐In Nanohole Array as Multifunctional Optical Sensing Platforms

Wang

Shi

et al. 2020

Small

Self Cite

View full text Add to dashboard Cite

show abstract

“…According to Sugavaneshwar et al [12], increasing metallicity of TiN boosts carrier concentration to approximately 8 × 10 22 /cm 3 , and this would lead to plasmonic absorption at wavelengths in the 600 nm range. Metallic TiN has reportedly a higher Fermi level and lower work function than Au [23,24]. This should result in electron transfer from TiN to Au, as depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

A TiN@Au-NR Plasmonic Structure with Tunable Surface Plasmon Resonance Depending on TiN to Au Thickness Ratio

Laghrissi

Es‐Souni

2020

Plasmonics

View full text Add to dashboard Cite

TiN nanostructures have been shown to exhibit promising plasmonic properties and are potential candidates for various applications, including energy harvesting. However, these properties also show a strong dependence on the processing conditions which have been reported to affect metallicity of TiN. Herein, we report on layered TiN@Au-nanorods (NRs) nanostructures consisting of 20 nm TiN thin layer that is magnetron sputtered on Au-NRs of variable length, yielding different TiN/Au thickness ratios (R). While a 20 nm TiN layer sputtered on the same substrate on which the Au-NRs are grown shows a weak absorption peak in the near IR region, an intense and broad plasmonic peak that lies red from the transverse plasmonic peak of monolithic Au-NRs layer is observed for TiN@Au-NRs. The red-shift is shown to increase with increasing R, attaining 100 nm for R = 1, together with an intense tail in the IR region. These results are interpreted in terms of a strong coupling between TiN and Au that drastically affects the plasmonic behavior of the structure. The results are contrasted with those on Pd@Au-NRs where only a slight blue-shift of few nanometers from the Au peak is observed. Potential applications of the TiN@Au-NRs are mainly in energy harvesting such as water splitting and photocatalysis using electromagnetic radiation in a broad wavelength range, as well as medical applications. Pd@Au-NRs may be used as electrocatalysts with plasmonic enhancement, e.g., for the hydrogen evolution reaction.

show abstract

“…The preferred formation of nanocomposite structures instead of alloys is mainly contributed to the high thermal stability and high oxidation resistance of Au and Pt . Besides, the PLD gives high kinetic energy to the ad‐atoms, which allow the effective diffusion on the substrate . During depositions, the formation energy of separated phases could be lower than that of the alloys, thus the Au (or Pt) ad‐atoms will continue to nucleate on Au (or Pt) nucleus instead of the VO 2 matrix.…”

Section: Resultsmentioning

confidence: 99%

Broad Range Tuning of Phase Transition Property in VO₂ Through Metal‐Ceramic Nanocomposite Design

Jian

Wang

Misra

et al. 2019

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

Vanadium dioxide (VO 2 ) is a well-studied Mott-insulator because of the very abrupt physical property switching during its semiconductor-to-metal transition (SMT) around 341 K (68 °C). In this work, through novel oxide-metal nanocomposite designs (i.e., Au:VO 2 and Pt:VO 2 ), a very broad range of SMT temperature tuning from ≈323.5 to ≈366.7 K has been achieved by varying the metallic secondary phase in the nanocomposites (i.e., Au:VO 2 and Pt:VO 2 thin films, respectively). More surprisingly, the SMT T c can be further lowered to ≈301.8 K (near room temperature) by reducing the Au particle size from 11.7 to 1.7 nm. All the VO 2 nanocomposite thin films maintain superior phase transition performance, i.e., large transition amplitude, very sharp transition, and narrow width of thermal hysteresis. Correspondingly, a twofold variation of the complex dielectric function has been demonstrated in these metal-VO 2 nanocomposites. The wide range physical property tuning is attributed to the band structure reconstruction at the metal-VO 2 phase boundaries. This demonstration paved a novel approach for tuning the phase transition property of Mott-insulating materials to near room temperature transition, which is important for sensors, electrical switches, smart windows, and actuators.

show abstract

Hybrid plasmonic Au–TiN vertically aligned nanocomposites: a nanoscale platform towards tunable optical sensing

Abstract: A tailorable Au–TiN hybrid plasmonic nanocomposite with tunable optical functionality has been demonstrated.

Cited by 41 publications

References 51 publications

Large‐Scale Plasmonic Hybrid Framework with Built‐In Nanohole Array as Multifunctional Optical Sensing Platforms

Large‐Scale Plasmonic Hybrid Framework with Built‐In Nanohole Array as Multifunctional Optical Sensing Platforms

A TiN@Au-NR Plasmonic Structure with Tunable Surface Plasmon Resonance Depending on TiN to Au Thickness Ratio

Broad Range Tuning of Phase Transition Property in VO₂ Through Metal‐Ceramic Nanocomposite Design

Contact Info

Product

Resources

About

Hybrid plasmonic Au–TiN vertically aligned nanocomposites: a nanoscale platform towards tunable optical sensing

Abstract: A tailorable Au–TiN hybrid plasmonic nanocomposite with tunable optical functionality has been demonstrated.

Cited by 41 publications

References 51 publications

Large‐Scale Plasmonic Hybrid Framework with Built‐In Nanohole Array as Multifunctional Optical Sensing Platforms

Large‐Scale Plasmonic Hybrid Framework with Built‐In Nanohole Array as Multifunctional Optical Sensing Platforms

A TiN@Au-NR Plasmonic Structure with Tunable Surface Plasmon Resonance Depending on TiN to Au Thickness Ratio

Broad Range Tuning of Phase Transition Property in VO2 Through Metal‐Ceramic Nanocomposite Design

Contact Info

Product

Resources

About

Broad Range Tuning of Phase Transition Property in VO₂ Through Metal‐Ceramic Nanocomposite Design