Nanoarchitectonics of photothermal materials to enhance the sensitivity of lateral flow assays

• Elangovan Sarathkumar,
• Rajasekharan S. Anjana and
• Ramapurath S. Jayasree

Beilstein J. Nanotechnol. 2023, 14, 988–1003, doi:10.3762/bjnano.14.82

• application in photothermal LFA. Size-dependent photothermal properties Gold nanoparticles have benefits in the field of diagnostics because of their high absorption cross section, LSPR, ease of preparation, stability, and variable surface chemistry [48]. Most importantly, the high number of synthesis methods

• to CC BY 4.0.). Comparison of absorption spectra of different sizes Au-nanorods (C). Maximum temperature raising profile with respect to absorption cross-section of Au-nanorods (D). (Figure 5C and D was reproduced from [48] (© 2022 J.-P. Sun et al., published by Elsevier, distributed under the terms

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

• thermal conductivity and absorption power of the surrounding medium. The temperature increase in the metal nanoparticles (ΔTNP) and thermal capacitance coefficient can be calculated using the following equation [96]: I is the illumination intensity of the laser source, σabs is the absorption cross section

• for selecting PT materials is the ratio between the absorption and scattering sections, termed the absorption ratio (α) and given by: I(λ) is the intensity of the incident radiation, Cabs(λ) is the absorption cross section, Cscat(λ) is the scattering cross section, and λmax and λmin are the maximum

• and minimum wavelength of the calculated solar radiation, respectively. The higher the ratio, the more suitable the material is for PT heating. With this in mind, a few of the key insights are the highly intense but narrow absorption cross section [99] of Au compared to other metals, the higher δ of

Theoretical investigations of oxygen vacancy effects in nickel-doped zirconia from ab initio XANES spectroscopy at the oxygen K-edge

• Dick Hartmann Douma,
• Lodvert Tchibota Poaty,
• Alessio Lamperti,
• Stéphane Kenmoe,
• Abdulrafiu Tunde Raji,
• Alberto Debernardi and
• Bernard M’Passi-Mabiala

Beilstein J. Nanotechnol. 2022, 13, 975–985, doi:10.3762/bjnano.13.85

• are computed using the XSPECTRA code [34], which is a module in the Quantum-ESPRESSO computational package. In the code, the X-ray absorption cross section is modeled in terms of a transition operator coupling initial and final states, which are solutions of the KS equations. For the K-edge

Using gold nanoparticles to detect single-nucleotide polymorphisms: toward liquid biopsy

• María Sanromán Iglesias and
• Marek Grzelczak

Beilstein J. Nanotechnol. 2020, 11, 263–284, doi:10.3762/bjnano.11.20

• giving rise to the so-called localized surface plasmon resonance (LSPR). The position and the bandwidth of the LSPR can be modulated by the shape of the nanocrystals and can vary between 400 and 2000 nm. The high absorption cross section (plasmonic nanoparticles absorb photons over a region about ten

Coating of upconversion nanoparticles with silica nanoshells of 5–250 nm thickness

• Cynthia Kembuan,
• Maysoon Saleh,
• Bastian Rühle,
• Ute Resch-Genger and
• Christina Graf

Beilstein J. Nanotechnol. 2019, 10, 2410–2421, doi:10.3762/bjnano.10.231

• excitation power density, this can influence both the UCL intensity and the UCL spectral distribution. In general, the coating with a thick silica shell is not expected to strongly affect the brightness of the UCNPs as long as the two properties absorption cross section and fluorescence quantum yield, which

Nonlinear absorption and scattering of a single plasmonic nanostructure characterized by x-scan technique

• Tushar C. Jagadale,
• Dhanya S. Murali and
• Shi-Wei Chu

Beilstein J. Nanotechnol. 2019, 10, 2182–2191, doi:10.3762/bjnano.10.211

• nonlinearity of a single nanostructure, but also reports surprisingly large plasmonic nonlinearities. Keywords: absorption cross section; laser scanning microscopy; nanoplasmonics; nonlinear absorption; nonlinear scattering; single gold nanostructures; Introduction It is well known that the optical

Time-resolved universal temperature measurements using NaYF₄:Er³⁺,Yb³⁺ upconverting nanoparticles in an electrospray jet

• Kristina Shrestha,
• Arwa A. Alaulamie,
• Ali Rafiei Miandashti and
• Hugh H. Richardson

Beilstein J. Nanotechnol. 2018, 9, 2916–2924, doi:10.3762/bjnano.9.270

• absorption cross section of water at 980 nm (3 × 10−28 m2/molecule) [38], Nw is the number density of water (3.33 × 1028 molecules/m3). The rate of heat loss is given by Equation 3 where h and S are the heat-transfer coefficient and surface concentration of water perpendicular to the direction of heat

Enhancement of X-ray emission from nanocolloidal gold suspensions under double-pulse excitation

• Wei-Hung Hsu,
• Frances Camille P. Masim,
• Armandas Balčytis,
• Hsin-Hui Huang,
• Tetsu Yonezawa,
• Aleksandr A. Kuchmizhak,
• Saulius Juodkazis and
• Koji Hatanaka

Beilstein J. Nanotechnol. 2018, 9, 2609–2617, doi:10.3762/bjnano.9.242

• great interest, due to the efficient conversion of the absorbed energy into energetic ions, electrons and X-rays [12][13][14]. Plasmonic nanoparticles are expected to be highly useful for femtosecond laser-based X-ray emission due to high functionality, large absorption cross section and spectral

Interaction-tailored organization of large-area colloidal assemblies

• Silvia Rizzato,
• Elisabetta Primiceri,
• Anna Grazia Monteduro,
• Adriano Colombelli,
• Angelo Leo,
• Maria Grazia Manera,
• Roberto Rella and
• Giuseppe Maruccio

Beilstein J. Nanotechnol. 2018, 9, 1582–1593, doi:10.3762/bjnano.9.150

• on the enhancement of the absorption cross-section (ACS) require the fabrication of plasmonic nanoparticles characterized by relatively small dimensions (e.g. ≈40 nm). On the contrary, applications based on the strong enhancement of the scattering cross-section (SCS), are generally associated to the

Surface characterization of nanoparticles using near-field light scattering

• Eunsoo Yoo,
• Yizhong Liu,
• Chukwuazam A. Nwasike,
• Sebastian R. Freeman,
• Brian C. DiPaolo,
• Bernardo Cordovez and
• Amber L. Doiron

Beilstein J. Nanotechnol. 2018, 9, 1228–1238, doi:10.3762/bjnano.9.114

• elucidated the effect of particle–waveguide interactions on velocity. The propulsion force is the summation of scattering and absorption forces, Fprop = Fabs + Fscat = (σscat + σabs)I/c, where σscat and σabs are the scattering and absorption cross section, respectively. The interaction between the particle

Circular dichroism of chiral Majorana states

• Javier Osca and
• Llorenç Serra

Beilstein J. Nanotechnol. 2018, 9, 1194–1199, doi:10.3762/bjnano.9.110

• , mass m ≡ 1/2m1 ≡ 1 and a chosen length unit LU, typically LU ≈ 1 μm. The corresponding energy unit is then . Circular dichroism We compute the optical absorption cross section for right (+) and left (−) circularly-polarized light from where is the energy difference between particle (unoccupied) and

CdSe nanorod/TiO₂ nanoparticle heterojunctions with enhanced solar- and visible-light photocatalytic activity

• Fakher Laatar,
• Hatem Moussa,
• Halima Alem,
• Lavinia Balan,
• Emilien Girot,
• Ghouti Medjahdi,
• Hatem Ezzaouia and
• Raphaël Schneider

Beilstein J. Nanotechnol. 2017, 8, 2741–2752, doi:10.3762/bjnano.8.273

• high interest for use as sensitizers for photocatalytic applications due to their high surface area, higher optical absorption cross section (as compared to spherical particles) and easier charge carrier separation [38]. Only a couple of reports describe the association of CdSe NRs with TiO2. Luo et al

Changes of the absorption cross section of Si nanocrystals with temperature and distance

• Michael Greben,
• Petro Khoroshyy,
• Sebastian Gutsch,
• Daniel Hiller,
• Margit Zacharias and
• Jan Valenta

Beilstein J. Nanotechnol. 2017, 8, 2315–2323, doi:10.3762/bjnano.8.231

• of Sciences, Flemingovo namesti 2, 160 00 Prague 6, Czech Republic Faculty of Engineering, IMTEK, Albert-Ludwigs-University Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany 10.3762/bjnano.8.231 Abstract The absorption cross section (ACS) of silicon nanocrystals (Si NCs) in single-layer

• Si NCs cannot be considered as independent on experimental conditions and sample parameters. Keywords: absorption cross section; average lifetime; nanocrystal distance; photoluminescence decay; silicon nanocrystals; Introduction For decades, silicon – an abundant, nontoxic material with high

• parameters for spectroscopic studies and the design of Si NC optoelectronic devices, which is related to the strength of light absorption: the absorption cross section (ACS), σ. The ACS directly reflects the probability of optical transitions and is defined as the ratio [7] between photon absorption rate for

Photobleaching of YOYO-1 in super-resolution single DNA fluorescence imaging

• Joseph R. Pyle and
• Jixin Chen

Beilstein J. Nanotechnol. 2017, 8, 2296–2306, doi:10.3762/bjnano.8.229

• fluorescence lifetime of the dye. The number of photons absorbed can be estimated using the following equation [47]: Photon absorption = σP/Eph, where σ is the absorption cross section, P is the laser power density and Eph is the energy of a photon. The photons absorbed by each YOYO-1 molecule at the highest

• laser power studied (62 W cm−2) is calculated to be 24 photons/ms using the energy of a photon at 473 nm (4.2 × 10−19 J/photon) and calculating the absorption cross section, 1.64 × 10−16 cm2 that is calculated from the extinction coefficient, 9.89 × 107 cm2 mol−1 (≈105 M−1 cm−1) [11]. Since the

Optical response of heterogeneous polymer layers containing silver nanostructures

• Miriam Carlberg,
• Florent Pourcin,
• Olivier Margeat,
• Judikaël Le Rouzo,
• Gérard Berginc,
• Rose-Marie Sauvage,
• Jörg Ackermann and
• Ludovic Escoubas

Beilstein J. Nanotechnol. 2017, 8, 1065–1072, doi:10.3762/bjnano.8.108

• be understood by considering the variation of the absorption cross-section, σabs, of a spherical NP according to the Mie theory: where k is the wave vector, ε is the complex dielectric function of the NP and εm the complex dielectric function of the surrounding medium. Furthermore, collective

Selective photodissociation of tailored molecular tags as a tool for quantum optics

• Ugur Sezer,
• Philipp Geyer,
• Moritz Kriegleder,
• Maxime Debiossac,
• Armin Shayeghi,
• Markus Arndt,
• Lukas Felix and
• Marcel Mayor

Beilstein J. Nanotechnol. 2017, 8, 325–333, doi:10.3762/bjnano.8.35

• initial extinction coefficient of εpc 1.4 × 105 L·mol−1·cm−1 corresponds to an absorption cross section of σpc 5.7 × 10−16 cm2. The photo-decay upon exposure to the more energetic 254 nm photons is about twice as fast compared to the 365 nm illumination. In summary, the NMR measurements as well as the

The role of morphology and coupling of gold nanoparticles in optical breakdown during picosecond pulse exposures

• Yevgeniy R. Davletshin and
• J. Carl Kumaradas

Beilstein J. Nanotechnol. 2016, 7, 869–880, doi:10.3762/bjnano.7.79

• -field enhancement than on the mass or absorption cross-section of the nanostructure. These findings can be used to advance the nanoparticle-based nanoscale manipulation of matter. Keywords: electron plasma; finite element method; optical breakdown; plasmon coupling; plasmonic nanoparticles

• the picosecond regime is highly dependent on the optical near-field enhancement instead of nanoparticle size and absorption cross-section. The findings of this study will help in LIB-related fields to advance the understanding of nanoparticle–laser interactions, which will lead to the better design of

• density above 1018 cm−3 during the pulse will change the optical properties of the environment in the vicinity of the nanoparticle, shielding the nanoparticle from the incoming irradiation. This will lead to a lowering of the absorption cross-section of the nanoparticle, lowering its heat generation

Optical absorption signature of a self-assembled dye monolayer on graphene

• Tessnim Sghaier,
• Sylvain Le Liepvre,
• Céline Fiorini,
• Ludovic Douillard and
• Fabrice Charra

Beilstein J. Nanotechnol. 2016, 7, 862–868, doi:10.3762/bjnano.7.78

• oriented parallel to the substrate. The maximum absorption is consistent with the measured surface density of molecules and their absorption cross section. The spectrum presents mainly a large red-shift of the absorption line compared with the free molecules dispersed in solution, whereas the relative

• a characteristic of the π-conjugated systems as present in the PTCDI core [33]. The main peak is the 0–0 at 2.35 eV and corresponds to an absorption cross section σSOL = 3.3 × 10−16 cm2 consistent with the molar attenuation coefficient reported in the literature for alkylated PTCDI [34]. Quantum

• ]. Given the molecule surface density of 0.45 molecule per nm2 measured by STM, the molecular absorption cross section can be thus evaluated to σML = 4.5 × 10−16 cm2. By assuming an in-plane orientation of the N–N′-axis, which gives a factor of 3/2 corresponding to a 2D orientational averaging of the

Nonlinear optical properties of near-infrared region Ag₂S quantum dots pumped by nanosecond laser pulses

• Li-wei Liu,
• Si-yi Hu,
• Yin-ping Dou,
• Tian-hang Liu,
• Jing-quan Lin and
• Yue Wang

Beilstein J. Nanotechnol. 2015, 6, 1781–1787, doi:10.3762/bjnano.6.182

• . In the last ten years, the study and development of QDs has rapidly progressed, and also influenced other research areas, such as nonlinear optics, plasmonics and biosensors. The special optical properties of QDs include good resistance to photo-bleaching, large absorption cross section, long

Charge carrier mobility and electronic properties of Al(Op)₃: impact of excimer formation

• Andrea Magri,
• Pascal Friederich,
• Bernhard Schäfer,
• Valeria Fattori,
• Xiangnan Sun,
• Timo Strunk,
• Velimir Meded,
• Luis E. Hueso,
• Wolfgang Wenzel and
• Mario Ruben

Beilstein J. Nanotechnol. 2015, 6, 1107–1115, doi:10.3762/bjnano.6.112

• -phenalen-9-olate to sensitize the europium ion. Furthermore, for lithium and sodium, the enhancement was found to be the most efficient. In these works, 9-hydroxyphenalen-1-one was carefully chosen for its photophysical properties, namely, its high absorption cross section in the condensed phase between

Hollow plasmonic antennas for broadband SERS spectroscopy

• Gabriele C. Messina,
• Mario Malerba,
• Pierfrancesco Zilio,
• Ermanno Miele,
• Michele Dipalo,
• Lorenzo Ferrara and
• Francesco De Angelis

Beilstein J. Nanotechnol. 2015, 6, 492–498, doi:10.3762/bjnano.6.50

• . The green line is the metal absorption cross section normalized to the incident power impinging on the antenna geometrical cross section. (b) Electric field maps corresponding to an excitation wavelength of 514 nm and 630 nm. Measurements of Raman intensities along the z-axis of the antenna using

Tunable light filtering by a Bragg mirror/heavily doped semiconducting nanocrystal composite

• Ilka Kriegel and
• Francesco Scotognella

Beilstein J. Nanotechnol. 2015, 6, 193–200, doi:10.3762/bjnano.6.18

• as where pS represents the substrate and p0 air. To calculate the optical properties of the doped Cu2−xSe NC dispersion in the region of plasmonic absorption we used the quasi-static approximation of Mie scattering theory, which provides the following expression for the absorption cross-section σA

Properties of plasmonic arrays produced by pulsed-laser nanostructuring of thin Au films

• Katarzyna Grochowska,
• Katarzyna Siuzdak,
• Peter A. Atanasov,
• Carla Bittencourt,
• Anna Dikovska,
• Nikolay N. Nedyalkov and
• Gerard Śliwiński

Beilstein J. Nanotechnol. 2014, 5, 2102–2112, doi:10.3762/bjnano.5.219

• a Drude metal, the absorption cross section of spherical nanoparticles is given by [37]: where ω is the irradiation frequency, c is the speed of light, V is the particle volume and εm, ε1, ε2 are the dielectric constants of the medium, and the real and imaginary parts of the metal dielectric

PVP-coated, negatively charged silver nanoparticles: A multi-center study of their physicochemical characteristics, cell culture and in vivo experiments

• Sebastian Ahlberg,
• Alexandra Antonopulos,
• Jörg Diendorf,
• Ralf Dringen,
• Matthias Epple,
• Rebekka Flöck,
• Wolfgang Goedecke,
• Christina Graf,
• Nadine Haberl,
• Jens Helmlinger,
• Fabian Herzog,
• Frederike Heuer,
• Stephanie Hirn,
• Christian Johannes,
• Stefanie Kittler,
• Manfred Köller,
• Katrin Korn,
• Wolfgang G. Kreyling,
• Fritz Krombach,
• Jürgen Lademann,
• Kateryna Loza,
• Eva M. Luther,
• Marcelina Malissek,
• Martina C. Meinke,
• Daniel Nordmeyer,
• Anne Pailliart,
• Jörg Raabe,
• Fiorenza Rancan,
• Barbara Rothen-Rutishauser,
• Eckart Rühl,
• Carsten Schleh,
• Andreas Seibel,
• Christina Sengstock,
• Lennart Treuel,
• Annika Vogt,
• Katrin Weber and
• Reinhard Zellner

Beilstein J. Nanotechnol. 2014, 5, 1944–1965, doi:10.3762/bjnano.5.205

• raster-scanned while the intensity of transmitted X-rays is recorded so that two-dimensional images are obtained. Besides a high spatial resolution (15 nm), X-ray microscopy provides a chemical contrast because of the strong variation of the absorption cross section in core level absorption. This also

Dye-doped spheres with plasmonic semi-shells: Lasing modes and scattering at realistic gain levels

• Nikita Arnold,
• Boyang Ding,
• Calin Hrelescu and
• Thomas A. Klar

Beilstein J. Nanotechnol. 2013, 4, 974–987, doi:10.3762/bjnano.4.110

• cross section becomes slightly negative in the vicinity of the absorption peak (discussed in more detail below). When approaching laser threshold, the full width at half maximum (FWHM) of the scattering and absorption peaks goes to zero [51], which is an artifact of the purely classical calculation

• concentrations less than 3.7 times larger than available in commercial PS spheres. Hence, we conclude that lasing should be possible in custom made PS spheres with a moderately enhanced dye concentration. No lasing is observed yet at the commercially available gain strength of ΔεDye = 0.004, but the absorption