High second-order nonlinear response of platinum nanoflowers: the role of surface corrugation

Ngo, Hoang Minh; Lai, Ngoc Diep; Ledoux‐Rak, Isabelle

doi:10.1039/c5nr07571h

Cited by 11 publications

(14 citation statements)

References 58 publications

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“…Indeed, El Harfouch et al 15 reported first hyperpolarizability values for gold nanospheres and nanorods in the range of 10 −25 −10 −24 esu, about 2 orders of magnitude higher than those for the present gold nanoprisms, in line with data obtained for other plasmonic nanoparticles. 16,32 In order to further support the surface origin of the nonlinearity, the first hyperpolarizabilities were normalized per unit surface area, see Table 2. The value of about (5 ± 2) × 10 −31 esu/nm 2 is obtained.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Adverse Role of Shape and Size in Second-Harmonic Scattering from Gold Nanoprisms

et al. 2020

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Gold nanoparticles are widely used in different fields. They are currently under extensive investigation with regard to their linear and nonlinear optical properties. So far, nanoparticles with centrosymmetrical shapes, such as nanospheres or nanorods, have received the main attention. In this work, the properties of gold nanoprisms exhibiting a highly noncentrosymmetrical threefold symmetry are investigated with hyper-Rayleigh scattering (HRS). Aqueous solutions of gold nanospheres and nanoprisms with different sizes were synthesized. The first hyperpolarizability magnitudes of both the nanospheres and nanoprisms were determined separately with the assumption of a surface origin of the nonlinearity. Using polarization-resolved HRS, retardation is shown to be largely underdeveloped for the nanoprisms as opposed to the nanospheres. The nanoprism shape noncentrosymmetry has therefore a leading role in the HRS response although it is also shown that surface defects induce deviations from the ideal threefold symmetry.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Adverse Role of Shape and Size in Second-Harmonic Scattering from Gold Nanoprisms

et al. 2020

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“…In view of the many merits induced by optofluidics, the microreactors may be also introduced to other APS systems such as nitrogen fixation (e.g., NH 4 ) [ 100 ], CH 4 [ 101 – 106 ], CO [ 107 – 111 ], formaldehyde [ 112 – 113 ], methanol [ 114 – 116 ], and formic acid [ 117 ]. More profound and meaningful work is expected to appear in the field of optofluidics-based APS since the optofluidic devices are versatile and can be integrated together with other functions, for instance, deoxygenation, temperature control, electricity/magnetic field and pressure [ 118 – 121 ].…”

Section: Discussionmentioning

confidence: 99%

Review on optofluidic microreactors for artificial photosynthesis

Huang¹,

Wang²,

Li³

et al. 2018

Beilstein J. Nanotechnol.

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Artificial photosynthesis (APS) mimics natural photosynthesis (NPS) to store solar energy in chemical compounds for applications such as water splitting, CO2 fixation and coenzyme regeneration. NPS is naturally an optofluidic system since the cells (typical size 10 to 100 µm) of green plants, algae, and cyanobacteria enable light capture, biochemical and enzymatic reactions and the related material transport in a microscale, aqueous environment. The long history of evolution has equipped NPS with the remarkable merits of a large surface-area-to-volume ratio, fast small molecule diffusion and precise control of mass transfer. APS is expected to share many of the same advantages of NPS and could even provide more functionality if optofluidic technology is introduced. Recently, many studies have reported on optofluidic APS systems, but there is still a lack of an in-depth review. This article will start with a brief introduction of the physical mechanisms and will then review recent progresses in water splitting, CO2 fixation and coenzyme regeneration in optofluidic APS systems, followed by discussions on pending problems for real applications.

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“…Au, Ag and Cu) are working under visible light irradiation, there are also examples of UV-plasmonic metal nanoparticles. For example, platinum (Pt) and many of its alloy nanoparticles exhibit significant plasmonic response in the UV range (< 300nm) [19,20].…”

Section: Configuration Of Cocatalyst Particlesmentioning

confidence: 99%

Cocatalysts on Semiconductor Photocatalyst: A Mini Review

2019

J. Idn. Chem. Soc.

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Recent progress in photocatalysts for sunlight energy conversion into chemical energy through water splitting, carbon dioxide (CO2) reduction, nitrogen fixation, etc. has witnessed the importance of cocatalysts in elevating the efficiency of the overall reaction systems. A cocatalyst can assist a semiconductor photocatalyst by promoting the transportation of photoexcited charges (electrons and holes). The improved shuttle of photoexcited charges has direct constructive impacts on the suppression of charge recombination, facilitation of redox reactions with reactants, and prevention of photo-corrosion (in certain photo-unstable semiconductor). Given the critical roles played by cocatalyst, the methodologies adopted in decorating such entities on a semiconductor photocatalyst would have influence in the surface and interfacial interaction between the two components, resulting in the tunability of reaction performance. In this mini review, we aim to summarize the structural configurations of cocatalyst-photocatalyst composites yielded via various loading methods. The implications of the resultant surface and interfacial interaction imposed by the cocatalysts are discussed to provide general guidance for tailoring an ideal photocatalytic system. Subsequently, we summarize the methodologies developed over years in loading of cocatalyst on semiconductor photocatalyst. The challenges presented at the end of this mini review serve as a platform of opportunity for this community to overcome or improve further. AcknowledgmentCocatalyst is a crucial component to provide efficient photocatalytic system. It serves different functions, ranging from electron sinks for the excited photocatalyst to the passivation role to suppress photo-corrosion of photocatalyst.The methods in loading cocatalyst onto semiconductor photocatalysts can affect the extent of influence. This minireview is, therefore, summarizing the commonly used and newly developed techniques in decorating photocatalyst with cocatalyst.

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High second-order nonlinear response of platinum nanoflowers: the role of surface corrugation

Cited by 11 publications

References 58 publications

Adverse Role of Shape and Size in Second-Harmonic Scattering from Gold Nanoprisms

Adverse Role of Shape and Size in Second-Harmonic Scattering from Gold Nanoprisms

Review on optofluidic microreactors for artificial photosynthesis

Cocatalysts on Semiconductor Photocatalyst: A Mini Review

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