Directional fluorescence emission from a compact plasmonic‐diamond hybrid nanostructure

Shen, Hongming; Chou, R. Yuanying; Hui, Yuen Yung; He, Yu; Cheng, Yuqing; Chang, Huan‐Cheng; Tong, Limin; Gong, Qihuang; Lü, Guowei

doi:10.1002/lpor.201600021

Cited by 36 publications

(32 citation statements)

References 43 publications

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“…In this study, we proposed to perform in situ single particle measurements to circumvent previous experimental limitation. We combined atomic force microscope (AFM) nanomanipulation technique with single particle spectroscopy method . We directly measured and compared the scattering and PL spectra of the same single GNR before and after coupling with monolayer graphene.…”

Section: Introductionmentioning

confidence: 99%

In situ Optical Study of Gold Nanorod Coupling with Graphene

Zhao

Cao

Cheng

et al. 2018

Advanced Optical Materials

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been demonstrated to create photodetectors, photovoltaic devices, and plasmonenhanced infrared spectroscopy. [10][11][12] To optimize the performance of hybrids system, a central question is to understand the electron or energy transfer between 2D material and metallic nanostructures. [13][14][15] Optical method is a versatile way to characterize the time scales for this process. In general, the transfer process is an additional decay channel for surface plasmon resonance of the gold nanoparticles. That would lead to a broadened linewidth and decreased amplitude of localized surface plasmon (LSP) resonances. [16] However, most early optical investigations of the hybrid structures rely on the ensemble measurements. [17,18] The hybrids have been proposed for SERS substrate to increase signal-to-noise ratio [19][20][21][22][23][24] since it can suppress continuum background (i.e., photoluminescence (PL) from the gold nanostructures). [25,26] The decreased background is attributed to the electron or energy transferring from gold to graphene [27,28] but ensemble measurement method cannot quantify the time scale of the transfer because of size and shape inhomogeneity of nanoparticles. [17] By contrast, single particle method enables measurement of homogeneous plasmon linewidth to determinate the transfer time scale. [16] Recently, Hoggard et al. employed single particle spectroscopy to investigate the interaction between gold nanorods (GNRs) and monolayer graphene. They statistically analyzed and compared the scattering spectra of hundreds of individual GNRs on quartz or on graphene substrates. [29] A time scale of ≈160 fs and a transfer efficiency of ≈10% were obtained. However, they did not observe intensity suppression of the scattering and PL spectra with comparison to previous ensemble measurements. That should be explained as the scattering intensity of individual nanoparticles vary more dramatically rather than the linewidth varying despite minor differences in the size. [30] At single particle level, this property hinders the statistical analysis method to determinate the changes of scattering and PL intensity. So far, previous reports about the scattering and PL of the hybrids were not always consistent each other. [17,29] This controversy is due to the limitation of measurement methods.In this study, we proposed to perform in situ single particle measurements to circumvent previous experimental limitation. We combined atomic force microscope (AFM) nanomanipulation technique with single particle spectroscopy method. [31,32] We directly measured and compared the scattering and PL spectra of Electron or energy transfer process is critical to understand the interaction between graphene and metal nanostructures. Combining atomic force microscope nanomanipulation with single-particle spectroscopy enables in situ investigation of the interaction between single gold nanorod and monolayer graphene. This paper reveals that scattering and photoluminescence intensity of the nanorod decreased after coupling with monolayer...

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Section: Introductionmentioning

confidence: 99%

In situ Optical Study of Gold Nanorod Coupling with Graphene

Zhao

Cao

Cheng

et al. 2018

Advanced Optical Materials

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“…Following this study, Shen et al. showed that unidirectional emission from a single FND could be generated if it was coupled with a GNR . The result was attributed to the interference between the electromagnetic fields produced by the dipole‐like source and the out‐of‐phase dipole induced in the GNR.…”

Section: Gold/diamond Nanohybridsmentioning

confidence: 81%

Diamond Nanothermometry

2017

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Measuring temperature at or far from equilibrium at the nanoscale is important in many fields of science and engineering. A variety of luminescent nanothermometers have been developed in the past decade for the measurements. Fluorescent nanodiamonds (FNDs) stand out from the rest in terms of biological use, because the nanomaterials contain negatively charged nitrogen-vacancy (NV À ) centers as photostable fluorophores and possess a number of remarkable properties including chemical inertness, negligible toxicity, versatile surface modification ability and, most importantly, exceptional temperature-measurement precision. However, to enable practical applications of FNDs for temperature sensing in biological systems, conjugation of the particles with polymers, biomolecules, and/or other nanomaterials are often required. Gold/diamond nanohybrids are one of these combinations that enhance the temperature measurement versatility of the NV À centers. Here, we provide a review of the recent advances in the research and development of diamond nanothermometry, with special focus on the synthesis, characterization, and applications of gold/ diamond nanohybrids. Current challenges and future perspectives of the FND-based nanothermometry are also discussed.

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“…The MoS 2 was obtained by a chemical vapor deposition method. Then, the sample was investigated by the single-particle spectroscopy 40,41 . Briefly, the microspectroscopy system integrated white-light dark-field scattering, photoluminescence, and AFM.…”

Section: Resultsmentioning

confidence: 99%

Controlling plasmon-exciton interactions through photothermal reshaping

Hu¹,

Liu²,

Zhao³

et al. 2020

Opto-Electronic Advances

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We investigated the plasmon-exciton interactions in an individual gold nanorod (GNR) with monolayer MoS 2 at room temperature with the single-particle spectroscopy technique. To control the plasmon-exciton interaction, we tuned the local surface plasmon resonance of an individual GNR in-situ by employing the photothermal reshaping effect. The scattering spectra of the GNR-MoS 2 hybrids exhibited two dips at the frequencies of the A and B excitons of monolayer MoS 2 , which were caused by the plasmon-induced resonance energy transfer effect. The resonance energy transfer rate increased when the surface plasmon resonance of the nanorod matched well with the exciton transition energy. Also, we demonstrated that the plasmon-enhanced fluorescence process dominated the photoluminescence of the GNR-MoS 2 hybrid. These results provide a flexible way to control the plasmon-exciton interaction in an all-solid-state operating system at room temperature.

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Directional fluorescence emission from a compact plasmonic‐diamond hybrid nanostructure

Cited by 36 publications

References 43 publications

In situ Optical Study of Gold Nanorod Coupling with Graphene

In situ Optical Study of Gold Nanorod Coupling with Graphene

Diamond Nanothermometry

Controlling plasmon-exciton interactions through photothermal reshaping

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