Fabrication of Au network by low-degree solid state dewetting: Continuous plasmon resonance over visible to infrared region

Liu, Jiliang; Chu, Lingling; Yao, Zhao; Sui, Mao; Zhu, Zhijun; Lee, Jihoon; Wang, Jiuxing; Belfiore, Laurence A.; Tang, Jianguo

doi:10.1016/j.actamat.2020.02.050

Cited by 24 publications

(12 citation statements)

References 38 publications

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“…More details of photo-FET fabrication was described in the previous photo-FET research. [46] Simulation by FDTD Method: FDTD method was employed to obtain the corresponding electrical-field distribution and absorption crosssections of Pd NPs via commercialized software FDTD solutions (Lumerical). In the FDTD model, a total field scattering field (TFSF) light source was engaged along z-axis with the polarization along yaxis.…”

Section: Methodsmentioning

confidence: 99%

Visible Light Driven Hot‐Electron Injection by Pd Nanoparticles: Fast Response in Metal–Semiconductor Photodetection

Chen

Sui

Wang

et al. 2020

Advanced Optical Materials

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multidisciplinary research interests. For instance, based on optical design, dimer NPs can obtain the enhancement factor over 10 14[1] therefore highly beneficial to the applications such as surface enhanced Raman spectroscopy (SERS) in which the detection accuracy is approaching to single molecular level. [2] Also, the intermittent photothermal effect of Au NPs that induced by pulsed laser has been demonstrated in ultrasonic wave generation [3,4] and utilized as laser-driven liquid pump via light-mechanical energy conversion, jetting the liquid with tunable characters. Whereas, in optoelectronic research, the important role of hot-electron generation by plasmon nonradiative decay has been gradually recognized and widely investigated in metal-semiconductor system with regards of the mechanism and dynamics. [5,6] According to the transparent spectral studies, hot-electron generated by LSPR decay can inject into the conductive band of neighbor semiconductor within 200 fs, [7,8,9] and via the recently proposed direct interfacial charge transfer transition mechanism, the injection can be further speeded up to even 30 fs, [10] presenting an encouraging mechanism to be applied in ultrafast photodetection. Meanwhile, the transparent injection efficiency was reported as high as 50%, [8,11] which is quite favorable for the energy conversion applications based on semiconductors including photo detection, photocatalysis, and photovoltaics. Although the transparent studies exhibit great potentiality for optoelectronics, in the applications at steady state, the actual efficiency was observed much lower. For example, Au/ TiO x system possess an injection efficiency over 40% according to the study based on pump-probe absorption spectrum, [8] however, the Au/TiO x plasmonic nanodiode can only achieve the IPCE of less than 3% [12] in sharp comparison. One of the important dynamic inducement lies on the material electronic structure. As the free electron of Au come from s-orbit, the plasmon resonance is mainly consisted of intraband transition absorption. [13,14] However, as the amount of s-electron is relatively small, the electron export can easily induce large decrease in Fermi energy level of electrons, therefore, result in a rising energy barrier and hinder the further electron injection. [8,15,16] Also, as the hot electrons originated by Au interband absorption Hot-electron injection induced by plasmon decay enables ultrafast electron transfer in femtosecond scale and therefore endows metallic nanoparticles (MNPs) promising potentials in high-speed optoelectronics. With much higher density of states next to its Fermi level, palladium (Pd) can more efficiently launch hot electrons according to the theoretical prediction, as compared to the conventional plasmonic NPs. In this work, the optical properties of Pd NPs as well as the plasmon induced hot-electron injection are investigated through confocal Kelvin probe force microscopy. Analysis based on surface potential redistribution suggests Pd NPs can initiate dense hot-electro...

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Section: Methodsmentioning

confidence: 99%

Visible Light Driven Hot‐Electron Injection by Pd Nanoparticles: Fast Response in Metal–Semiconductor Photodetection

Chen

Sui

Wang

et al. 2020

Advanced Optical Materials

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“…[54] The absorption bands of metal oxide nanocrystals (NCs) can be effectively managed by tuning their localized surface plasmon resonance (LSPR) via either aliovalent atom-doping or electrochemical doping at sufficient potentials. [54][55][56] LSPR is a phenomenon in which light absorption can be enhanced when the incident light frequency matches the natural resonance frequency of collective electron oscillations of the materials, [22,[57][58][59][60] and the LSPR frequency is positively correlated with the free carrier density. [61][62] LSPR occurs not only on the surface of plasmonic metals such as Au and Ag, but also in metal oxide semiconductors with extraordinary free carrier densities.…”

Section: Inorganic Ec Materialsmentioning

confidence: 99%

Recent Advances on Dual‐Band Electrochromic Materials and Devices

Zhai

Shen

et al. 2022

Adv Funct Materials

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117

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Dual-band electrochromism is a phenomenon where materials can independently regulate the transmittance of visible (VIS) and near-infrared (NIR) light. Owing to their bistability, low energy consumption, and independent control over VIS and NIR regions, dual-band electrochromic (EC) devices have been of great significance to fully harnessing VIS and NIR light and building an energy-saving society. The past several years have witnessed the efforts put in developing novel EC materials to improve their dual-band optical performance through altering their composition, structural, and physicochemical features, which determine the optical behavior of dual-band EC devices. In this review, the concept, significance, working principle, and key influence factors of dual-band electrochromism are briefly introduced. Next, the up-to-date progress of dual-band EC materials including inorganic, organic, and composites materials are summarized, with a focus on material design, device fabrication, and performance optimization. Finally, the challenges and perspectives of dual-band EC materials and devices are also presented.

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“…Au films (10 nm) were deposited on SiO 2 /Si substrates using thermal evaporation, where the thickness of films was controlled by the deposition time. The 10 nm Au films was annealed in a rapid thermal annealing (RTA) chamber at 800 • C for 120 s for the fabrication of core Au NPs arrays based on the solid-state dewetting [35,36]. Subsequently, the ultrathin dielectric layer-i.e., 3 nm Al 2 O 3 film-was deposited on the as-prepared core Au NPs via the ALD method.…”

Section: Hybrid Nanostructures Fabricationmentioning

confidence: 99%

Hierarchically Assembled Plasmonic Metal-Dielectric-Metal Hybrid Nano-Architectures for High-Sensitivity SERS Detection

et al. 2022

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In this work, we designed and prepared a hierarchically assembled 3D plasmonic metal-dielectric-metal (PMDM) hybrid nano-architecture for high-performance surface-enhanced Raman scattering (SERS) sensing. The fabrication of the PMDM hybrid nanostructure was achieved by the thermal evaporation of Au film followed by thermal dewetting and the atomic layer deposition (ALD) of the Al2O3 dielectric layer, which is crucial for creating numerous nanogaps between the core Au and the out-layered Au nanoparticles (NPs). The PMDM hybrid nanostructures exhibited strong SERS signals originating from highly enhanced electromagnetic (EM) hot spots at the 3 nm Al2O3 layer serving as the nanogap spacer, as confirmed by the finite-difference time-domain (FDTD) simulation. The PMDM SERS substrate achieved an outstanding SERS performance, including a high sensitivity (enhancement factor, EF of 1.3 × 108 and low detection limit 10−11 M) and excellent reproducibility (relative standard deviation (RSD) < 7.5%) for rhodamine 6G (R6G). This study opens a promising route for constructing multilayered plasmonic structures with abundant EM hotspots for the highly sensitive, rapid, and reproducible detection of biomolecules.

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Fabrication of Au network by low-degree solid state dewetting: Continuous plasmon resonance over visible to infrared region

Cited by 24 publications

References 38 publications

Visible Light Driven Hot‐Electron Injection by Pd Nanoparticles: Fast Response in Metal–Semiconductor Photodetection

Visible Light Driven Hot‐Electron Injection by Pd Nanoparticles: Fast Response in Metal–Semiconductor Photodetection

Recent Advances on Dual‐Band Electrochromic Materials and Devices

Hierarchically Assembled Plasmonic Metal-Dielectric-Metal Hybrid Nano-Architectures for High-Sensitivity SERS Detection

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