Ultrafast excited state dynamics and femtosecond nonlinear optical properties of laser fabricated Au and Ag50Au50 nanoparticles

Krishnakanth, K. N.; Byram, Chandu; Bharathi, M.; Raavi, Sai Santosh Kumar; Rao, S. Venugopal

doi:10.1016/j.optmat.2019.109239

Cited by 23 publications

(5 citation statements)

References 42 publications

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“…The analysis of the decay dynamics at 460 nm for AgNPs, Ag–AgMOM (3 h) and Ag–AgMOM (28 h) (Supplementary Fig. 59b and Figure 5a-c ) show strong positive signal peaking at around 460 nm was observed in the TA spectrum of pure AgNPs, which decays single exponentially (2.5 ps), possibly due to the photoinduced absorption as previously reported 43 . In contrast, the negative (bleaching) signals of Ag–AgMOM samples at 460 nm, which is related to plasmonic excitation of AgNPs therein, decay in a few ps timescales.…”

Section: Resultssupporting

confidence: 77%

Silver nanoparticle enhanced metal-organic matrix with interface-engineering for efficient photocatalytic hydrogen evolution

Liu

Debnath

et al. 2023

Nat Commun

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Integrating plasmonic nanoparticles into the photoactive metal-organic matrix is highly desirable due to the plasmonic near field enhancement, complementary light absorption, and accelerated separation of photogenerated charge carriers at the junction interface. The construction of a well-defined, intimate interface is vital for efficient charge carrier separation, however, it remains a challenge in synthesis. Here we synthesize a junction bearing intimate interface, composed of plasmonic Ag nanoparticles and matrix with silver node via a facile one-step approach. The plasmonic effect of Ag nanoparticles on the matrix is visualized through electron energy loss mapping. Moreover, charge carrier transfer from the plasmonic nanoparticles to the matrix is verified through ultrafast transient absorption spectroscopy and in-situ photoelectron spectroscopy. The system delivers highly efficient visible-light photocatalytic H2 generation, surpassing most reported metal-organic framework-based photocatalytic systems. This work sheds light on effective electronic and energy bridging between plasmonic nanoparticles and organic semiconductors.

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Section: Resultssupporting

confidence: 77%

Silver nanoparticle enhanced metal-organic matrix with interface-engineering for efficient photocatalytic hydrogen evolution

Liu

Debnath

et al. 2023

Nat Commun

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“…The NPs revealed their NLO susceptibility response in the order of ∼10 −13 e.s.u. Further, Krishnakanth et al [159] have thoroughly investigated the NLO properties of Ag 50 Au 50 bi-metallic alloy NPs along with pure Au NPs. Laser ablation experiments were performed with 800 nm, 1 kHz, 50 fs laser for the green synthesis of the NPs.…”

Section: Nonlinear Optical Response From Laser-synthesized Nmsmentioning

confidence: 99%

Review of ultrafast laser ablation for sensing and photonic applications

Byram

Moram

Banerjee

et al. 2023

J. Opt.

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Since its discovery, laser ablation in liquid (LAL) technique has engrossed significant attention from the research community and is gradually becoming a fascinating fabrication technique to synthesize nanostructures (NSs) of diverse morphologies on solid targets as well as nanoparticles (NPs) with distinct shapes/sizes in a single attempt. Moreover, this technique has plethora of advantages over the chemical routes such as simplicity, robustness, and purity of the produced NPs/NSs, as well as the circumvention of stabilizing reagents and/or chemical precursors during the synthesis. The present review focuses on our research group’s significant contributions and achievements over the past 10 years on laser-synthesized nanomaterials (NMs) and their applications in sensing [using the technique of surface enhanced Raman spectroscopy (SERS)] and nonlinear optics (NLO)/photonics. We highlight in the first section the governing mechanisms involved in the LAL technique with laser pulses of different duration such as nanosecond, picosecond, and femtosecond. Subsequent section discusses the effect of input laser pulse parameters (wavelength, fluence, pulse duration, reputation rate, and the number of pulses) as well as surrounding ambience (air and liquid) on the morphological changes of the substrate’s surfaces used in the production of nanoparticles (NPs) and surface nanostructures (NSs). The later section of this review describes the overview of LAL applications with particular emphasis on surface-enhanced Raman scattering based hazardous materials sensing and nonlinear optics/photonics.

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“…TA spectra for both the systems exhibit similar kind of transient bleach and positive wings like 400 nm excitation. [ 30 ] Cu 2− x Se also exhibit a broad positive signal in the visible region upon 800 nm excitation (Figure S13, Supporting Information). As argued earlier, the positive spectra will not have much effect on the bleach signal and dynamics.…”

Section: Resultsmentioning

confidence: 99%

Ultrafast Plasmonic Hot Hole Transfer and Plasmon Dynamics in a Dual Plasmonic Au@p‐Cu₂₋_xSe Heterostructure

Sachdeva¹,

Ghorai²,

Kharbanda³

et al. 2023

Advanced Optical Materials

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Metal‐semiconductor heterostructures have significant potential in harvesting plasmon induced hot charge carriers for photocatalytic and photovoltaic devices. Despite numerous studies, the field of hot hole transfer in heterostructures remains unexplored. In this work, the plasmon dynamics of a dual plasmonic core–shell Au@p‐Cu2−xSe heterostructure are investigated with the aid of femtosecond broadband pump probe spectroscopy. Ultrafast studies reveal that hot holes generated within the d and sp band after 400 and 800 nm excitations are injected from Au to copper selenide. Hot hole transfer substantially reduces the transient signal intensity and electron phonon relaxation time for Au plasmon. Increment in the transient signal intensity and slower kinetics for the semiconducting plasmon of Au@Cu2−xSe validate the hot hole transfer in the valence band of copper selenide. Fluence dependent studies reveal that d band hot holes extraction is more efficient than that of sp band hot holes.

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Ultrafast excited state dynamics and femtosecond nonlinear optical properties of laser fabricated Au and Ag50Au50 nanoparticles

Cited by 23 publications

References 42 publications

Silver nanoparticle enhanced metal-organic matrix with interface-engineering for efficient photocatalytic hydrogen evolution

Silver nanoparticle enhanced metal-organic matrix with interface-engineering for efficient photocatalytic hydrogen evolution

Review of ultrafast laser ablation for sensing and photonic applications

Ultrafast Plasmonic Hot Hole Transfer and Plasmon Dynamics in a Dual Plasmonic Au@p‐Cu₂₋_xSe Heterostructure

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Ultrafast excited state dynamics and femtosecond nonlinear optical properties of laser fabricated Au and Ag50Au50 nanoparticles

Cited by 23 publications

References 42 publications

Silver nanoparticle enhanced metal-organic matrix with interface-engineering for efficient photocatalytic hydrogen evolution

Silver nanoparticle enhanced metal-organic matrix with interface-engineering for efficient photocatalytic hydrogen evolution

Review of ultrafast laser ablation for sensing and photonic applications

Ultrafast Plasmonic Hot Hole Transfer and Plasmon Dynamics in a Dual Plasmonic Au@p‐Cu2−xSe Heterostructure

Contact Info

Product

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Ultrafast Plasmonic Hot Hole Transfer and Plasmon Dynamics in a Dual Plasmonic Au@p‐Cu₂₋_xSe Heterostructure