Noble Metal Nanoparticles: Synthesis and Optical Properties

Hubenthal, Frank

doi:10.1016/b978-0-12-374396-1.00034-9

Cited by 47 publications

(32 citation statements)

References 313 publications

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“…Nanoparticle synthesis is usually carried out by various physical and chemical methods, such as laser ablation, pyrolysis, chemical or physi-cal vapor deposition, sol gel, lithography electro-deposition most of them being expensive, and/or requiring the use of toxic solvents [6] Recently, great efforts are made to use environmentally friendly methods for the synthesis of noble metal nanoparticles [7]. This is achieved mostly by the use of plant or fruit extracts [8] and bioorganisms [9].…”

Section: Introductionmentioning

confidence: 99%

Green synthesis and characterization of silver nanoparticles produced using Arbutus Unedo leaf extract

et al. 2012

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Metallic nanoparticles have received great attention from chemists, physicists, biologists and engineers who wish to use them for the development of a new generation of nanodevices. In the present study silver nano-particles were synthesized from aqueous silver nitrate through a simple and eco-friendly route using leaf broth of Arbutus unedo, which acted as a reductant and stabilizer simultaneously. The aqueous silver ions when exposed to the leaf broth were reduced and stabilized over long periods of time resulting in the green synthesis of surface functionalized silver nanoparticles. The bio-reduced silver nanoparticles were appropriately characterized. The results revealed the formation of single crystalline Ag nanoparticles with a nar-row size distribution for each sample. The particles, although discrete, were predominately coated with the organic leaf extract forming small aggregates, which makes them stable over long time periods and highly appropriate for coatings or biotechnology applications.

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Section: Introductionmentioning

confidence: 99%

Green synthesis and characterization of silver nanoparticles produced using Arbutus Unedo leaf extract

et al. 2012

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“…As a consequence, nanoparticles with an oblate shape are generated, which can be approximated by rotational ellipsoids [15,17,44]. We emphasize that due to the surface energies, the nanoparticles are truncated at the contact plane to the substrate.…”

Section: Methodsmentioning

confidence: 99%

“…One direct and powerful technique is transition electron microscopy (TEM) [15,[28][29][30][31][32][33][34][35][36][37]40], but TEM suffers from the fact that sample preparation for three-dimensional TEM investigations is rather complicated and cannot be easily accomplished in situ. In addition, obtaining sufficient statistical data from TEM measurements is extremely time consuming.…”

Section: Introductionmentioning

confidence: 99%

“…Mie obtained his solution after a multipole expansion of the electromagnetic fields, which yields the extinction cross section of the particles as the sum of absorption and scattering of a series of multipole excitations. For particles much smaller than the wavelength of light, the quasistatic approximation simplifies the general electrodynamic problem into electrostatic [13][14][15]. Within this approximation, scattering and higher multipole modes are neglected and the plasmon is solely due to absorption of an electric dipole.…”

Section: Introductionmentioning

confidence: 99%

“…In the general case of ellipsoidal metal particles, the polarizability along the axis i is given by [13][14][15][16]:…”

Section: Introductionmentioning

confidence: 99%

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Determination of Morphological Parameters of Supported Gold Nanoparticles: Comparison of AFM Combined with Optical Spectroscopy and Theoretical Modeling versus TEM

2012

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The morphology of small gold particles prepared by Volmer-Weber growth on sapphire substrates have been investigated by two different characterization techniques. First, by non-extensive atomic force microscopy (AFM) in combination with optical spectroscopy and modeling of the optical properties using a theoretical model, recently developed in our group. Second, by extensive transmission electron microscopy (TEM). Comparing the results obtained with both techniques demonstrate that for small gold nanoparticles within the quasistatic limit, the morphological properties can be precisely determined by an appropriate theoretical modeling of the optical properties in combination with simple AFM measurements. The apparent mean axial ratio of the nanoparticles, i.e., the axial ratio that corresponds to the center frequency of the ensemble plasmon resonance, is obtained easily from the extinction spectrum. The mean size is determined by the nanoparticle number density and the amount of deposited material, measured by AFM and a quartz micro balance, respectively. To extract the most probable axial ratio of the nanoparticle ensemble, i.e., the axial ratio that corresponds to the most probable nanoparticle size in the ensemble, we apply the new theoretical model, which allows to extract the functional dependence of the nanoparticle shape on its size. The morphological parameters obtained with this procedure will be afterwards compared to extensive TEM measurements. The results obtained with both techniques yield excellent agreement. For example, the lateral dimensions of the nanoparticles after deposition of 15.2 × 10 15 atoms/cm 2 of gold has been compared. While a mean lateral diameter of (13 ± 2) nm has been extracted from AFM, optical spectroscopy and modeling, a value of (12 ± 2) nm is derived from TEM.

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Durable Thin‐Film DLC on Wafer Surfaces of Gravure Cylinders for Roll‐to‐Roll Printing of 1‐Bit Electrodes and Microtext in Flexible Electronics and Graphic Security

Seetharamiahsrinivasaraju,

Shetty,

Saxena

et al. 2024

Advanced Materials

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Diamond‐Like Carbon (DLC), a thin‐film material, is emerging as a promising alternative for durable surfaces due to its eco‐friendly application process. This study evaluated the use of thin‐film DLC on the wafer surface of gravure cylinders for roll‐to‐roll printing of fine‐line electrodes and microtext patterns, specifically for applications in flexible electronics and graphics security. Results suggested that using thin film DLC on the wafer surface allows reliable reproduction of isometric grids and line structures with widths of 15, 20, and 30 µm, as well as solid electrodes. The uniform conformity of thin‐film DLC on the wafer surface, featuring an engraved micron‐size cell structure, demonstrates superior ink transfer onto flexible PET (polyethylene terephthalate) substrates. This results in increased electrode line width and reduced electrical resistance compared to chrome. Statistical analysis confirmed the reliability and repeatability of the findings. Visual analysis of lines and microtext also demonstrated the reliable print‐reproducing capabilities of DLC‐coated surfaces. Overall, these results suggest that thin‐film DLC is a promising alternative for use as a protective layer on gravure wafer surfaces. It has the potential to produce high‐quality, high‐volume electronics, such as sensors, antennas, and batteries, for applications in the Internet of Things (IoT) and other sustainable technologies.

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Noble Metal Nanoparticles: Synthesis and Optical Properties

Cited by 47 publications

References 313 publications

Green synthesis and characterization of silver nanoparticles produced using Arbutus Unedo leaf extract

Green synthesis and characterization of silver nanoparticles produced using Arbutus Unedo leaf extract

Determination of Morphological Parameters of Supported Gold Nanoparticles: Comparison of AFM Combined with Optical Spectroscopy and Theoretical Modeling versus TEM

Durable Thin‐Film DLC on Wafer Surfaces of Gravure Cylinders for Roll‐to‐Roll Printing of 1‐Bit Electrodes and Microtext in Flexible Electronics and Graphic Security

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