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2 article(s) from Dharmalingam, Gnanaprakash

Plasmonic nanotechnology for photothermal applications – an evaluation

A. R. Indhu,
L. Keerthana and
Gnanaprakash Dharmalingam

Beilstein J. Nanotechnol. 2023, 14, 380–419, doi:10.3762/bjnano.14.33

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Figure 1: Schematic representation of surface plasmon resonance (SPR) excitation. (a) SPR wave or surface pla...

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Figure 2: Optical spectra (absorption – red, scattering – blue, and extinction – black) of different morpholo...

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Figure 3: Manifestation of the governing factors of SPR. Shown are the changes to the peak position while con...

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Figure 4: Dissipation ratio of electron–hole pair loss vs phonon loss of the surface plasmon excitation for d...

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Figure 5: Extinction efficiencies of gold nanospheres calculated through the quasi-static approximation vs us...

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Figure 6: Absorption spectra of Au nanospheres of different diameters showing the shift of excitation wavelen...

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Figure 7: Normalized absorption spectra of Ag-NMs with different radii of the concentric spheres irradiated u...

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Figure 8: The PT conversion mechanism. (a) Photoexcitation of plasmons. (b) Electron thermalization. (c) Elec...

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Figure 9: Radiative and non-radiative decay time scales of the conversion processes in PPT materials. For the...

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Figure 10: Hot carrier lifetimes on the Fermi surface and variation between positive and negative curvature, e...

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Figure 11: Electron–phonon coupling timescales for different diameters of metal nanoparticles: (a) Ag, (b) Au,...

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Figure 12: Comparison of the probability distribution of electrons and holes at various energy levels for coin...

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Figure 13: Relaxation process of the phonon vibration. Figure 13i (left panel) was redrawn from [82]. Figure 13ii (right panel) was ad...

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Figure 14: Thermal capacitance coefficient (β) for the ellipsoidal, rod, disk, and ring morphologies of Au nan...

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Figure 15: Absorption spectra of spherical nanoparticles of Ag, Au, and Cu with radii between 50 and 100 nm an...

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Figure 16: PT conversion and thermalization of plasmonic nanoparticles after absorption of a laser pulse. The ...

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Figure 17: SEM images of Au nanoassemblies. (a) Hexagonally filled Au polyhedra. (b) Hexagonally filled Au pol...

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Figure 18: (i) FDTD calculation of absorption spectra of Au nanorods (aspect ratio of ca. 3) for different num...

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Figure 19: TEM images with 50 nm scale bars of linked Ag nanospheres prepared with an injection rate of 5 μL/m...

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Figure 20: TEM images of CuS, metal, and bimetal plasmonic nanoparticles and the corresponding temperature ris...

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Figure 21: (i) (a, b) SEM images of a black Au membrane in a hexagonal ordered array of AAO. (c) Thermal image...

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Figure 22: (i) Simulated electric field intensities of Ag/SiO₂ at the ZX plane: (a) Core–shell (d_Ag = 40 nm, t...

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Figure 23: Integrated nanostructures for PT conversion. (i) Hollow mesoporous bimetallic (Ag/Au) nanoshells fo...

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Figure 24: PT conversion efficiencies of different transition metal nitrides (HfN, ZrN, and TiN) and the corre...

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Figure 25: Colloidal stability of nanoparticles for different particle sizes from 8 to 68 nm of organic pigmen...

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Figure 26: Illustration of the chemical interaction stability of nanoparticles. (i) Chemical interactions betw...

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Figure 27: Thermal stability of Ag and Au nanoparticles of different shapes at different temperatures. (i) (a)...

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Figure 28: Thermal stability of Au nanorods at increasing temperatures. (i) Aspect ratio and plasmonic absorba...

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Review

Published 27 Mar 2023

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Plasmonics-based detection of H₂ and CO: discrimination between reducing gases facilitated by material control

Gnanaprakash Dharmalingam,
Nicholas A. Joy,
Benjamin Grisafe and
Michael A. Carpenter

Beilstein J. Nanotechnol. 2012, 3, 712–721, doi:10.3762/bjnano.3.81

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Figure 1: (a) Change in peak position of the small-particle sample between exposures to air and H₂. The lower...

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Figure 2: Hydrogen-exposure plots of (a) small-particle and (b) medium-particle samples. Concentrations of 20...

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Figure 3: Hydrogen exposure plots of (a) thinner gold, (b) co-sputtered and (c) large-particle samples. The e...

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Figure 4: Calibration curves of all investigated samples for hydrogen. Error bars for each of the five separa...

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Figure 5: Exposure plots of (a) co-sputtered sample and (b) small-particle sample to CO. The concentrations t...

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Figure 6: CO Calibration curves for the small particle sample and the co-sputtered sample. The error bars are...

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Figure 7: Exposure plot of small-particle sample to NO₂. The concentrations tested were 2, 5, 10, 50 and 100 ...

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Figure 8: PC scores plot for (a) small-particle sample and (b) co-sputtered sample in an air background at 50...

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Figure 9: Optical sensing apparatus. From left: UV–vis source, quartz flow cell with gas inlet and outlet por...

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Figure 10: ESEM images of (a) small-particle and (b) medium-particle films. The annealing times were kept cons...

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Figure 11: ESEM images of (a) large-particle sample and (b) thinner gold sample. Diameter measurements were ca...

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Full Research Paper

Published 31 Oct 2012

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Plasmonic nanotechnology for photothermal applications – an evaluation

Plasmonics-based detection of H2 and CO: discrimination between reducing gases facilitated by material control

Plasmonics-based detection of H₂ and CO: discrimination between reducing gases facilitated by material control