Search results

Search for "plasmon resonance" in Full Text gives 211 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Key for crossing the BBB with nanoparticles: the rational design

  • Sonia M. Lombardo,
  • Marc Schneider,
  • Akif E. Türeli and
  • Nazende Günday Türeli

Beilstein J. Nanotechnol. 2020, 11, 866–883, doi:10.3762/bjnano.11.72

Graphical Abstract
  • targeting ligands, such as angiopep-2, TAT or EGF, allows their accumulation to be increased in these specific areas [70][78][107][176]. Although to a lower extent, gold nanorods (AuNRs) have also been used for brain delivery. AuNRs, like AuNPs, exhibit an optical feature called surface plasmon resonance
PDF
Album
Review
Published 04 Jun 2020

Effect of Ag loading position on the photocatalytic performance of TiO2 nanocolumn arrays

  • Jinghan Xu,
  • Yanqi Liu and
  • Yan Zhao

Beilstein J. Nanotechnol. 2020, 11, 717–728, doi:10.3762/bjnano.11.59

Graphical Abstract
  • efficiency of methylene blue (MB) compared with Ag-coated TiO2 (ACT) nanocolumn arrays and pure TiO2 nanocolumns arrays. Both experimental and theoretical simulation results demonstrated that the enhanced photocatalytic performance of AFT nanocolumn arrays was attributed to the surface plasmon resonance (SPR
  • ) of Ag and the absorption of light by TiO2. These results represent a promising step forward to the development of high-performance photocatalysts for energy conversion and storage. Keywords: anodic aluminum oxide template; nanocolumn arrays; photocatalysis; surface plasmon resonance; Introduction
  • resonance (SPR), which leads to strongly absorbed visible light and enhancement of local electromagnetic fields [14]. Among the noble metals, Ag nanostructures have been widely used as catalysts because of their reasonable cost and broad plasmon resonance in the visible region [15][16]. At present, the
PDF
Album
Full Research Paper
Published 05 May 2020

Luminescent gold nanoclusters for bioimaging applications

  • Nonappa

Beilstein J. Nanotechnol. 2020, 11, 533–546, doi:10.3762/bjnano.11.42

Graphical Abstract
  • single atom. Additionally, due to covalently bound ligands, the NCs show extraordinary stability under ambient conditions. While plasmonic AuNPs display size-dependent surface plasmon resonance (SPR), NCs display characteristic molecule-like electronic spectra. This is attributed to the small size and
  • quantum confinement, and the evolution of continuous or quasicontinuous bands (of bulk gold) into discrete electronic states [40]. Another attractive property of AuNCs is photoluminescence (PL), a phenomenon that is much less understood than the surface plasmon resonance of plasmonic gold nanoparticles
PDF
Album
Review
Published 30 Mar 2020

Multilayer capsules made of weak polyelectrolytes: a review on the preparation, functionalization and applications in drug delivery

  • Varsha Sharma and
  • Anandhakumar Sundaramurthy

Beilstein J. Nanotechnol. 2020, 11, 508–532, doi:10.3762/bjnano.11.41

Graphical Abstract
  • charged silica NPs as well as the disulfide linkages between cysteine blocks and gold NPs resulted in two types of functionalities in the capsule. In a similar way, the capsules incorporated with noble metal NPs (e.g., gold and silver) respond to external light illumination by increased surface plasmon
  • resonance of the outer shell electrons present in noble metals. The absorbed light is converted to heat energy, which causes layer damage, thereby opening the capsules and releasing the encapsulated material [83]. The parameters such as the preparation condition of capsules, the distribution and aggregation
PDF
Album
Review
Published 27 Mar 2020

Evolution of Ag nanostructures created from thin films: UV–vis absorption and its theoretical predictions

  • Robert Kozioł,
  • Marcin Łapiński,
  • Paweł Syty,
  • Damian Koszelow,
  • Wojciech Sadowski,
  • Józef E. Sienkiewicz and
  • Barbara Kościelska

Beilstein J. Nanotechnol. 2020, 11, 494–507, doi:10.3762/bjnano.11.40

Graphical Abstract
  • quality of the nanostructures, in terms of their use as plasmonic platforms, is reflected in the UV–vis absorption spectra. The absorption spectrum is dominated by a maximum in the range of 450–500 nm associated with the plasmon resonance. As the initial layer thickness increases, an additional peak
  • : dewetting; finite-difference time-domain (FDTD) method; plasmon resonance; silver (Ag) nanostructures; thin films; UV–vis absorption; Introduction In the last decade there has been significant development in sensor-related research regarding the application in optical, medical or biological areas [1][2][3
  • ][4][5]. The principle of some of these sensors is the resonant enhancement of a local electromagnetic field as well as a sharp spectral absorption, which can be achieved by exploiting localized surface plasmon resonance (LSPR). This phenomenon is based on collective oscillations of free electrons
PDF
Album
Full Research Paper
Published 25 Mar 2020

Preparation and in vivo evaluation of glyco-gold nanoparticles carrying synthetic mycobacterial hexaarabinofuranoside

  • Gennady L. Burygin,
  • Polina I. Abronina,
  • Nikita M. Podvalnyy,
  • Sergey A. Staroverov,
  • Leonid O. Kononov and
  • Lev A. Dykman

Beilstein J. Nanotechnol. 2020, 11, 480–493, doi:10.3762/bjnano.11.39

Graphical Abstract
  • . Another advantage of using these GNPs is their strong light absorption due to localized surface plasmon resonance (LSPR) around 520 nm while colloids of GNPs smaller than 3 nm do not exhibit an LSPR and are barely colored. It is known that the color of GNP colloids dramatically depends on size and shape
PDF
Album
Supp Info
Full Research Paper
Published 19 Mar 2020

Synthesis and enhanced photocatalytic performance of 0D/2D CuO/tourmaline composite photocatalysts

  • Changqiang Yu,
  • Min Wen,
  • Zhen Tong,
  • Shuhua Li,
  • Yanhong Yin,
  • Xianbin Liu,
  • Yesheng Li,
  • Tongxiang Liang,
  • Ziping Wu and
  • Dionysios D. Dionysiou

Beilstein J. Nanotechnol. 2020, 11, 407–416, doi:10.3762/bjnano.11.31

Graphical Abstract
  • spectra were collected to study the optical properties of the samples. As shown in Figure 5a, the CuO/tourmaline composite exhibited higher optical adsorption than that of pure CuO, due to the plasmon resonance of the tourmaline units [24]. The band gap of CuO and CuO/tourmaline composite was calculated
PDF
Album
Supp Info
Full Research Paper
Published 02 Mar 2020

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

Graphical Abstract
  • 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
  • particles relative to each other are restricted, which imposes a colorimetric transition, i.e., a blueshift or redshift of the localized surface plasmon resonance [138]. It is reasonable to assume that development of biosensors for liquid biopsy will benefit from growing research on dynamic self-assembly of
PDF
Album
Review
Published 31 Jan 2020

Fabrication of Ag-modified hollow titania spheres via controlled silver diffusion in Ag–TiO2 core–shell nanostructures

  • Bartosz Bartosewicz,
  • Malwina Liszewska,
  • Bogusław Budner,
  • Marta Michalska-Domańska,
  • Krzysztof Kopczyński and
  • Bartłomiej J. Jankiewicz

Beilstein J. Nanotechnol. 2020, 11, 141–146, doi:10.3762/bjnano.11.12

Graphical Abstract
  • silver diffusion in Ag–TiO2 core–shell nanostructures (CSNs). Our approach comprises three simple steps starting from the synthesis of the metallic core, through its coating with titania and finally annealing leading to plasmonic hollow nanostructures with plasmon resonance in a broad spectral range. SEM
  • result, to a red-shift of the plasmon resonance [20]. As can be seen from curve A in Figure 4, Ag@TiO2 CSNs have a broad absorption in the UV–vis range. This is the characteristic absorption of these composites, which does not change remarkably with a change of the shell thickness. The annealing of Ag
  • @TiO2 CSNs leads to nanostructures with significantly changed optical properties as can be seen from curves B–E in Figure 4. In all cases, a red-shift of the maximum of absorption and a strengthening and widening of the plasmon resonance bands were observed. It is significant that the Ag-modified TiO2
PDF
Album
Supp Info
Letter
Published 10 Jan 2020

Label-free highly sensitive probe detection with novel hierarchical SERS substrates fabricated by nanoindentation and chemical reaction methods

  • Jingran Zhang,
  • Tianqi Jia,
  • Yongda Yan,
  • Li Wang,
  • Peng Miao,
  • Yimin Han,
  • Xinming Zhang,
  • Guangfeng Shi,
  • Yanquan Geng,
  • Zhankun Weng,
  • Daniel Laipple and
  • Zuobin Wang

Beilstein J. Nanotechnol. 2019, 10, 2483–2496, doi:10.3762/bjnano.10.239

Graphical Abstract
  • chemical (CM) [5] and electromagnetic enhancement (EM) [6][7]. The CM enhancement is the main factor for charge transfer between the SERS substrate and probe molecule. The EM field enhancement is the main factor for localized surface plasmon resonance (LSPR) and significantly depends on the induced near
PDF
Album
Full Research Paper
Published 13 Dec 2019

The role of Ag+, Ca2+, Pb2+ and Al3+ adions in the SERS turn-on effect of anionic analytes

  • Stefania D. Iancu,
  • Andrei Stefancu,
  • Vlad Moisoiu,
  • Loredana F. Leopold and
  • Nicolae Leopold

Beilstein J. Nanotechnol. 2019, 10, 2338–2345, doi:10.3762/bjnano.10.224

Graphical Abstract
  • surface of the AgNPs. Therefore, the observed blue shift and damping of the surface plasmon resonance (SPR) peak, which is observed only after the formation of Ag+ adions, indicates an electronic contact between the AgNPs and citrate (Figure 1B) [28][29][30]. No SERS spectra of citrate were obtained at pH
PDF
Album
Supp Info
Full Research Paper
Published 27 Nov 2019

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

Graphical Abstract
  • properties of plasmonic nanostructures differ significantly from those of the corresponding bulk materials, mainly because of two reasons, i.e., the enhancement in the surface-to-volume ratio and the appearance of resonance effects such as surface plasmon resonance (SPR). For example, the color, or more
PDF
Album
Full Research Paper
Published 06 Nov 2019

Gold-coated plant virus as computed tomography imaging contrast agent

  • Alaa A. A. Aljabali,
  • Mazhar S. Al Zoubi,
  • Khalid M. Al-Batanyeh,
  • Ali Al-Radaideh,
  • Mohammad A. Obeid,
  • Abeer Al Sharabi,
  • Walhan Alshaer,
  • Bayan AbuFares,
  • Tasnim Al-Zanati,
  • Murtaza M. Tambuwala,
  • Naveed Akbar and
  • David J. Evans

Beilstein J. Nanotechnol. 2019, 10, 1983–1993, doi:10.3762/bjnano.10.195

Graphical Abstract
  • confirms the formation of spherical particles for all three sizes. The surface plasmon resonance depends on the shape and the size of the NPs. For instance, ellipsoid shapes with three different axes have three different dipole modes. When the size of the spherical AuNPs increases, their SPR does not red
  • functionalization of Au-CPMV. The localized surface plasmon resonance (LSPR) spectrum shifted by almost 4 nm (Figure 3A). This shift of the extinction maximum from 534 nm to 538 nm is a result of an increase in the local refractive index at the Au-CPMV surface as reported in the literature following surface
PDF
Album
Full Research Paper
Published 07 Oct 2019

Porous silver-coated pNIPAM-co-AAc hydrogel nanocapsules

  • William W. Bryan,
  • Riddhiman Medhi,
  • Maria D. Marquez,
  • Supparesk Rittikulsittichai,
  • Michael Tran and
  • T. Randall Lee

Beilstein J. Nanotechnol. 2019, 10, 1973–1982, doi:10.3762/bjnano.10.194

Graphical Abstract
  • -isopropylacrylamide (NIPAM) and acrylic acid (AAc). The hydrogel cores were then encased within either a porous or complete silver shell for which the localized surface plasmon resonance (LSPR) extends from visible to near-infrared (NIR) wavelengths (i.e., λmax varies from 550 to 1050 nm, depending on the porosity
PDF
Album
Full Research Paper
Published 04 Oct 2019

Pulsed laser synthesis of highly active Ag–Rh and Ag–Pt antenna–reactor-type plasmonic catalysts

  • Kenneth A. Kane and
  • Massimo F. Bertino

Beilstein J. Nanotechnol. 2019, 10, 1958–1963, doi:10.3762/bjnano.10.192

Graphical Abstract
  • –reactor; catalysis; heterostructures; laser ablation; multicomponent; nanoparticles; 4-nitrophenol; plasmonic; Pt; Rh; Introduction Metal nanoparticles can interact with visible light through an excitation of the localized surface plasmon resonance (LSPR). The LSPR is a resonant, collective oscillation
  • , where plasmonic Ag nanostructures focus and transfer the energy of incoming photons to neighboring Rh or Pt NPs via LSPR. The attribution is based on red-shifts and blue-shifts in the Ag plasmon resonance and on reports in the literature, specifically, the previously mentioned reports of Aslam et al
PDF
Album
Supp Info
Letter
Published 26 Sep 2019

The influence of porosity on nanoparticle formation in hierarchical aluminophosphates

  • Matthew E. Potter,
  • Lauren N. Riley,
  • Alice E. Oakley,
  • Panashe M. Mhembere,
  • June Callison and
  • Robert Raja

Beilstein J. Nanotechnol. 2019, 10, 1952–1957, doi:10.3762/bjnano.10.191

Graphical Abstract
  • techniques were used to explore the nature of the Au species. UV–vis measurements show signals attributed to localised surface plasmon resonance for both Au/MP-SAPO-5 (Figure S8, Supporting Information File 1) and Au/HP-SAPO-5 (Figure S9, Supporting Information File 1) systems suggesting that nanoparticles
PDF
Album
Supp Info
Letter
Published 25 Sep 2019

Growth dynamics and light scattering of gold nanoparticles in situ synthesized at high concentration in thin polymer films

  • Corentin Guyot,
  • Philippe Vandestrick,
  • Ingrid Marenne,
  • Olivier Deparis and
  • Michel Voué

Beilstein J. Nanotechnol. 2019, 10, 1768–1777, doi:10.3762/bjnano.10.172

Graphical Abstract
  • mass percentages of gold were also tested (1–3 wt %). At the end of the annealing, the films became reddish. The optical transmission was measured showing a plasmon resonance near 530 nm (data not shown). On the basis of these experiments, in order to achieve AuNP synthesis within reasonable time, 2
  • plasmon resonance in the global complex dielectric function of the material εtot is widely used. In this case, εtot is the sum of two contributions, namely the matrix and a Lorentzian oscillator describing the resonance. This Kramers–Kronig consistent approach learns us that the spectral range over which
PDF
Album
Supp Info
Full Research Paper
Published 23 Aug 2019

Highly ordered mesoporous silica film nanocomposites containing gold nanoparticles for the catalytic reduction of 4-nitrophenol

  • Mohamad Azani Jalani,
  • Leny Yuliati,
  • Siew Ling Lee and
  • Hendrik O. Lintang

Beilstein J. Nanotechnol. 2019, 10, 1368–1379, doi:10.3762/bjnano.10.135

Graphical Abstract
  • diffraction peak at 2θ = 38.2°, a surface plasmon resonance peak between 500–580 nm, and the spherical shape observed in the transmission electron microscope images, as well as the visual change in color from pink to purple. Interestingly, by simply dipping the material into a reaction solution of 4
  • TEM 3D tomography at low accelerating voltage with topography-based reconstruction to show the pore orientation at the various angles with the presence of AuNPs (see Supporting Information File 1 for the movie). Optical properties of AuNPs Surface plasmon resonance (SPR) peaks in the UV–vis spectrum
  • 140 minutes. Summary of the d100 XRD peaks, d-spacing of mesoporous silica, the crystallite size based on calculations using Scherrer’s equation, and the surface plasmon resonance (SPR) peak maxima of the AuNPs after both types of heat treatments. Supporting Information Supporting Information File
PDF
Album
Supp Info
Full Research Paper
Published 05 Jul 2019

Construction of a 0D/1D composite based on Au nanoparticles/CuBi2O4 microrods for efficient visible-light-driven photocatalytic activity

  • Weilong Shi,
  • Mingyang Li,
  • Hongji Ren,
  • Feng Guo,
  • Xiliu Huang,
  • Yu Shi and
  • Yubin Tang

Beilstein J. Nanotechnol. 2019, 10, 1360–1367, doi:10.3762/bjnano.10.134

Graphical Abstract
  • the carriers migrating to the surface of the semiconductor to participate in the photoreactions [15]. Decorating semiconductors with noble metals, such as Ag, Au, and Pt, is a strategy to enhance the photocatalytic performance. Certain noble metals exhibiting surface plasmon resonance (SPR) can
  • photogenerated electron–hole pairs, thus greatly improving the photocatalytic activity of the semiconductor photocatalyst. Conclusion 0D/1D heterostructure Au/CBO composite photocatalysts were synthesized by a simple in situ thermal reduction–precipitation method. Due to the plasmon resonance effect of the Au
PDF
Album
Supp Info
Full Research Paper
Published 04 Jul 2019

Janus-micromotor-based on–off luminescence sensor for active TNT detection

  • Ye Yuan,
  • Changyong Gao,
  • Daolin Wang,
  • Chang Zhou,
  • Baohua Zhu and
  • Qiang He

Beilstein J. Nanotechnol. 2019, 10, 1324–1331, doi:10.3762/bjnano.10.131

Graphical Abstract
  • ], surface plasmon resonance [10], molecularly imprinted polymers [6], and fluorescence polarization [11] have been proposed to detect TNT. However, most of these techniques have major limitations such as cumbersome pretreatment, complicated operation, long detection time and high cost. In recent years
PDF
Album
Supp Info
Full Research Paper
Published 28 Jun 2019

A silver-nanoparticle/cellulose-nanofiber composite as a highly effective substrate for surface-enhanced Raman spectroscopy

  • Yongxin Lu,
  • Yan Luo,
  • Zehao Lin and
  • Jianguo Huang

Beilstein J. Nanotechnol. 2019, 10, 1270–1279, doi:10.3762/bjnano.10.126

Graphical Abstract
  • electromagnetic field caused by localized surface plasmon resonance [46]. In order to create more nanogaps and to generate more hot spots to improve the SERS effect, a number of nanostructures based on metal particles were prepared by different methods, such as thermal evaporation [47], electrospray [48], inject
  • results. The reflectance UV–vis spectra of the samples are presented in Figure 3b. No obvious absorption band was observed for the bare cellulose filter paper (Supporting Information File 1, Figure S4). For sample Ag-NP/cellulose-NF–A, the strong surface plasmon resonance absorption band of silver
  • nanoparticles was observed at around 400 nm. With increasing size of the silver nanoparticles, this band gradually broadened and red-shifted to 450 nm for sample Ag-NP/cellulose-NF–E. It is known that, along with the increment of the silver nanoparticle sizes, the corresponding surface plasmon resonance band
PDF
Album
Supp Info
Full Research Paper
Published 24 Jun 2019

Revisiting semicontinuous silver films as surface-enhanced Raman spectroscopy substrates

  • Malwina Liszewska,
  • Bogusław Budner,
  • Małgorzata Norek,
  • Bartłomiej J. Jankiewicz and
  • Piotr Nyga

Beilstein J. Nanotechnol. 2019, 10, 1048–1055, doi:10.3762/bjnano.10.105

Graphical Abstract
  • percolation threshold has the SERS signal about four times lower than the highest signal sample. Keywords: metal island film; plasmon resonance; semicontinuous silver film; SERS; surface-enhanced Raman spectroscopy; Introduction Noble metal nanostructures exhibit exceptional optical properties. They can
PDF
Album
Full Research Paper
Published 15 May 2019
Graphical Abstract
  • suitability of plasmonic SERS labels for ultrasensitive analytical and biomedical applications is evident. Keywords: discrete dipole approximation (DDA); gold nanoparticles (AuNPs); nanotags; surface-enhanced Raman scattering (SERS); surface plasmon resonance (SPR); Introduction In surface-enhanced Raman
  • phenomena, the local electric field enhancement due to the surface plasmon resonance of the metal nanostructure (electromagnetic enhancement) and the charge transfer between the molecule and the metal substrate (chemical enhancement) [6][7][8]. In addition, given the generally low Raman scattering cross
PDF
Album
Supp Info
Full Research Paper
Published 10 May 2019

Structural and optical properties of penicillamine-protected gold nanocluster fractions separated by sequential size-selective fractionation

  • Xiupei Yang,
  • Zhengli Yang,
  • Fenglin Tang,
  • Jing Xu,
  • Maoxue Zhang and
  • Martin M. F. Choi

Beilstein J. Nanotechnol. 2019, 10, 955–966, doi:10.3762/bjnano.10.96

Graphical Abstract
  • is smaller than 3 nm, the surface plasmon resonance band broadens into the baseline and the absorption spectra show only the characteristic exponential decay curve [40]. For even smaller AuNCs, some molecular features may begin to appear because of the presence of HOMO–LUMO band gaps [41]. The inset
PDF
Album
Full Research Paper
Published 25 Apr 2019

Fabrication of silver nanoisland films by pulsed laser deposition for surface-enhanced Raman spectroscopy

  • Bogusław Budner,
  • Mariusz Kuźma,
  • Barbara Nasiłowska,
  • Bartosz Bartosewicz,
  • Malwina Liszewska and
  • Bartłomiej J. Jankiewicz

Beilstein J. Nanotechnol. 2019, 10, 882–893, doi:10.3762/bjnano.10.89

Graphical Abstract
  • ][8][9], photovoltaics [10] or optical sensing through localized surface plasmon resonance (LSPR) [11]. It is therefore not surprising that quite a number of studies have been initiated and performed in order to design and fabricate highly active SERS substrates based on metallic nanoparticles and
  • resonance of Ag NPs. The small shift of the plasmon resonance peak may be related to rather small variations of the size of particles between samples obtained using various deposition process parameters. Then reflectance increases and reaches a maximum in the range of 450 to 520 nm and decreases again
  • ,respectively. The samples with the smallest dimensions of silver nanoislands (samples A, B, F, G, H, and I) have completely different shapes of spectra. These samples have a much lower reflectance in the range of 350 to 850 nm with one characteristic minimum between 400 and 430 nm, which corresponds to plasmon
PDF
Album
Supp Info
Full Research Paper
Published 16 Apr 2019
Other Beilstein-Institut Open Science Activities