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2 article(s) from Soma, Venugopal Rao

Fabrication of hafnium-based nanoparticles and nanostructures using picosecond laser ablation

Abhishek Das,
Mangababu Akkanaboina,
Jagannath Rathod,
R. Sai Prasad Goud,
Kanaka Ravi Kumar,
Raghu C. Reddy,
Ratheesh Ravendran,
Katia Vutova,
S. V. S. Nageswara Rao and
Venugopal Rao Soma

Beilstein J. Nanotechnol. 2024, 15, 1639–1653, doi:10.3762/bjnano.15.129

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Figure 1: (a) XRD data and (b) EDX data of pristine Hf target.

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Figure 2: Schematic representation of the experimental setup used for picosecond LAL of a Hf target (M_n repre...

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Figure 3: TEM images, particle size distributions, and SAED patterns of laser-ablated NPs in (a–c) DW, (d–f) ...

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Figure 4: High-resolution TEM images of laser-ablated NPs in (a) DW, (b) toluene, and (c) anisole.

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Figure 5: Zoomed TEM images of the shell-like structures shown in Figure 4b and Figure 4c for (a) toluene and (b) anisole (the ...

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Figure 6: SAED measurement locations and patterns for (a, b) nanofibres and (c, d) NPs obtained in DW.

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Figure 7: EDX spectra and elemental composition of (a) HfNPs-D, (b) HfNPs-T, and (c) HfNPs-A.

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Figure 8: Reflectance spectra of NPs drop-cast on Si substrates measured under different incident angles: (a)...

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Figure 9: PL spectra of NPs laser-ablated in (a) DW, (b) toluene, and (c) anisole.

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Figure 10: Schematic of the NS fabrication by raster scanning the sample, resulting in LSFL and HSFL formation....

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Figure 11: FESEM image and inverse FFTs of LSFL with spatial periodicity on laser-ablated NSs in (a, b) DW, (c...

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Figure 12: FESEM image and HSFL size distribution of NSs laser-ablated in (a, b) DW, (c, d) toluene, and (e, f...

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Figure 13: Spatial periodicity of (a) LSFL and (b) HSFL as function of the refractive index.

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Full Research Paper

Published 18 Dec 2024

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Effect of wavelength and liquid on formation of Ag, Au, Ag/Au nanoparticles via picosecond laser ablation and SERS-based detection of DMMP

Sree Satya Bharati Moram,
Chandu Byram and
Venugopal Rao Soma

Beilstein J. Nanotechnol. 2024, 15, 1054–1069, doi:10.3762/bjnano.15.86

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Figure 1: (a)–(c) Absorption spectra of laser-synthesized NPs (a) Ag NPs [AgD1, AgD2, AgD3, AgN1, AgN2, AgN3]...

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Figure 2: TEM images of Ag NPs: (a) AgD1, (b) AgD2, (c) AgD3, (d) AgN1, (e) AgN2, and (f) AgN3.

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Figure 3: TEM images of Au NPs: (a) AuD1, (b) AuD2, (c) AuD3, (d) AuN1, (e) AuN2, and (f) AuN3.

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Figure 4: TEM images of Ag/Au NPs: (a) AgAuD1, (b) AgAuD2, (c) AgAuD3, (d) AgAuN1, (e) AgAuN2, and (f) AgAuN3....

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Figure 5: The variation in sizes of NPs at different wavelengths and environments. The left panel displays th...

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Figure 6: Panels (a)−(c) display FESEM images of a filter paper loaded with Ag NPs obtained in DW: (a) AgD1, ...

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Figure 7: Panels (a)−(c) display FESEM images of a filter paper loaded with Ag/Au NPs obtained in DW: (a) AgA...

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Figure 8: The SERS spectra of MG (1 nM) using filter paper loaded with ps laser ablated NPs (i) AgD, (ii) AuD...

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Figure 9: The SERS spectra of methyl salicylate (1 mM) using filter paper loaded with ps laser-ablated Ag, Au...

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Figure 10: Stability of paper-based SERS substrates: (a) MG (1 nM) and (b) thiram (10 µM). Prominent peak inte...

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Figure 11: The SERS spectra of (a) MS (1 mM) and (b) DMMP (1 mM) at different Raman laser excitations: 633, 53...

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Full Research Paper

Published 19 Aug 2024

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