Synthesis of Plasmonic Group‐4 Nitride Nanocrystals by Solid‐State Metathesis

Karaballi, Reem A.; Humagain, Govinda; Fleischman, Benjamin R. A.; Dasog, Mita

doi:10.1002/ange.201813134

Cited by 19 publications

(25 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is also evident from the absence in spectral evolution in time (Figure 2), thus peaks. [45,46] S3, Sup porting Information) show little change with excitation wave length (500 nm and 630 nm); interestingly, with the center wavelength for the bleach being some 80 nm blueshifted from the center of the plasmonic band (in contrast to gold, where the bleach is centered on the plasmon band). [47] While there is nor mally a shortlived blueshift in plasmonic particles after excita tion owing to excited electrons, [52] this is not the case here as the blueshift is retained throughout the observed time frame.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Ultrafast Photoinduced Heat Generation by Plasmonic HfN Nanoparticles

O'Neill

Frehan

Zhu

et al. 2021

Advanced Optical Materials

View full text Add to dashboard Cite

carrier generation. [1,2] This has led to sig nificant interest in plasmonic nanostruc tures for photocatalysis, either through local heat generation or as a photo sensitizer. [3,4] Materials in the family of plasmonic transition metal nitrides (e.g., TiN, HfN, NbN, WN) feature high ther momechanical robustness and recently have been proposed for applications requiring extreme operating conditions, such as photothermal catalysis or solar thermophoto voltaics. [5] These materials have high melting points and demonstrate high temperature durability, chemical sta bility, and corrosion resistance, while pre senting an optical response similar to Au or Ag plasmonic nanostructures. [5,6] With a strong response in the visible range, high mechanical hardness, low material cost, [6][7][8][9] and outstanding performance in electro chemical reactions, [10][11][12] the photophysics of these materials requires further research. In the following, we will briefly review the current level of understanding of the photophysics of noble metal plasmonic particles, followed by a discussion on transition metal nitride plasmonic nanoparticles.Light absorption and heat generation by noble metal nano particles can be summarized as follows: first, the local surface plasmon resonance (LSPR) is excited, which lasts several fs and decays by nonradiative dephasing through Landau damp ening (1-100 fs). This process generates hot carriers at regions with high optical absorption (hotspots), the hot carriers subse quently decay by electron-electron scattering (1-100 fs) followed by electron-phonon coupling (0.1-10 ps). Ultimately, phonons dissipate heat to the surroundings (1-10 ns). [4,13,14] There is increasing interest in hot carrier processes, chemical reac tions induced by them, and determining whether the observed changes in chemical reactions are due to lattice heating or hot charge carriers. [15,16] Since elementary chemical transformations typically occur on a 1-100 ps timescale, [17] it is essential to characterize the light induced carrier dynamics and thermal relaxation of plasmonic systems that consist of nonnoble metal materials. Recent studies have shown that in particular hafnium nitride (HfN) performs well at converting light into heat through thermoplas monic relaxation. [18,19] This efficient lightinduced heating likely stems from a less negative real permittivity (ε′) and a higher imaginary permittivity (ε″) of HfN relative to noble metals, leading to a lossy plasmonic response accompanied by lower There is great interest in the development of alternatives to noble metals for plasmonic nanostructures. Transition metal nitrides are promising due to their robust refractory properties. However, the photophysics of these nanostructures, particularly the hot carrier dynamics and photothermal response on ultrafast timescales, are not well understood. This limits their implementation in applications such as photothermal catalysis or solar thermophotovoltaics. In this study, the light-induced relaxation processes in water-dispersed Hf...

show abstract

Section: Resultsmentioning

confidence: 99%

“…The photoexcitation wavelengths used in this work are indicated with dashed lines. b) X-ray diffraction pattern with indexed HfN peaks [45,46]. Asterisks (*) indicate HfO 2 peaks (COD card 400-1331).…”

mentioning

confidence: 99%

Ultrafast Photoinduced Heat Generation by Plasmonic HfN Nanoparticles

O'Neill

Frehan

Zhu

et al. 2021

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…1(d), typical three-peak-shaped W4f XPS spectrum can be well fitted into two spin-orbit doublets, among which the doublet peaks located at 31.9 and 34.0 eV are ascribed to W-N chemical bond, while the two small peaks at the high binding energy range (35.4 and 37.5 eV) are corresponding to W-O chemical bond [51]. It should be pointed out that the oxygen signal should result from the unavoidable surface oxidation [52]. In the Ta 4f XPS spectrum of tantalum nitride (Fig.…”

Section: Introductionmentioning

confidence: 95%

Structural engineering of transition-metal nitrides for surface-enhanced Raman scattering chips

Lan

Yao

et al. 2021

Nano Res.

View full text Add to dashboard Cite

Noble-metal-free surface-enhanced Raman scattering (SERS) substrates have attracted great attention for their abundant sources, good signal uniformity, superior biocompatibility, and high chemical stability. However, the lack of controllable synthesis and fabrication of noble-metal-free substrates with high SERS activity impedes their practical applications. Herein, we propose a general strategy to fabricate a series of planar transition-metal nitride (TMN) SERS chips via an ambient temperature sputtering deposition route. These planar TMN (tungsten nitride, tantalum nitride, and molybdenum nitride) chips show remarkable Raman enhancement factors (EFs) with ~10 5 owing to efficient photoinduced charge transfer process between TMN chips and probe molecules. Further, structural engineering of 2 these TMN chips is used to improve their SERS activity. Benefiting from the synergistic effect of charge transfer process and electric field enhancement by constructing nanocavity structure, the Raman EF of WN nanocavity chips could be greatly improved to ∼1.29 × 10 7 , which is an order of magnitude higher than that of planar chips. Moreover, we also design the WN/monolayer MoS2 heterostructure chips. With the increase of surface electron density on the upper WN and more exciton resonance transitions in the heterostructure, a ∼1.94 × 10 7 level EF and a 5 × 10 -10 M level detention limit could be achieved. Our results provide important guidance for the structural design of ultrasensitive noble-metal-free SERS chips.

show abstract

“…Efforts have also been made to modulate the LSPR behavior of noble metals via exotic morphologies [ 98 ]. Atomistic and continuum calculations have provided deeper understanding of the plasmonic responses of these noble metals, and recent efforts have also focused on the use of phase and compositional changes to help evoke plasmon responses in lower cost, non-plasmonic noble metals, transition metal oxides and nitrides, and chalcogenide compounds [ 21 , 99 , 100 , 101 , 102 , 103 ].…”

Section: Introductionmentioning

confidence: 99%

Hot Electrons in TiO2–Noble Metal Nano-Heterojunctions: Fundamental Science and Applications in Photocatalysis

Manuel

Shankar

2021

Nanomaterials

View full text Add to dashboard Cite

Plasmonic photocatalysis enables innovation by harnessing photonic energy across a broad swathe of the solar spectrum to drive chemical reactions. This review provides a comprehensive summary of the latest developments and issues for advanced research in plasmonic hot electron driven photocatalytic technologies focusing on TiO2–noble metal nanoparticle heterojunctions. In-depth discussions on fundamental hot electron phenomena in plasmonic photocatalysis is the focal point of this review. We summarize hot electron dynamics, elaborate on techniques to probe and measure said phenomena, and provide perspective on potential applications—photocatalytic degradation of organic pollutants, CO2 photoreduction, and photoelectrochemical water splitting—that benefit from this technology. A contentious and hitherto unexplained phenomenon is the wavelength dependence of plasmonic photocatalysis. Many published reports on noble metal-metal oxide nanostructures show action spectra where quantum yields closely follow the absorption corresponding to higher energy interband transitions, while an equal number also show quantum efficiencies that follow the optical response corresponding to the localized surface plasmon resonance (LSPR). We have provided a working hypothesis for the first time to reconcile these contradictory results and explain why photocatalytic action in certain plasmonic systems is mediated by interband transitions and in others by hot electrons produced by the decay of particle plasmons.

show abstract

Synthesis of Plasmonic Group‐4 Nitride Nanocrystals by Solid‐State Metathesis

Cited by 19 publications

References 58 publications

Ultrafast Photoinduced Heat Generation by Plasmonic HfN Nanoparticles

Ultrafast Photoinduced Heat Generation by Plasmonic HfN Nanoparticles

Structural engineering of transition-metal nitrides for surface-enhanced Raman scattering chips

Hot Electrons in TiO2–Noble Metal Nano-Heterojunctions: Fundamental Science and Applications in Photocatalysis

Contact Info

Product

Resources

About