Detection of Hg(II) at Part-Per-Quadrillion Levels by Fiber Optic Plasmonic Absorption Using DNA Hairpin and DNA-Gold Nanoparticle Conjugates

2021 ◽  
Author(s):  
Shu-Mei Fan ◽  
Chang-Yue Chiang ◽  
Yen-Ta Tseng ◽  
Tsung-Yan Wu ◽  
Yen-Ling Chen ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Fiber Optic ◽  
Dna Hairpin

Bacteria functionalized gold nanoparticle matrix based fiber-optic sensor for monitoring heavy metal pollution in water

2019 ◽  
Vol 281 ◽  
pp. 643-651 ◽  
Author(s):  
Pallavi Halkare ◽  
Nirmal Punjabi ◽  
Jigme Wangchuk ◽  
Aswathy Nair ◽  
Kiran Kondabagil ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Gold Nanoparticle ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Optic Sensor

Gold nanoparticle enhanced multiplexed biosensing on a fiber optic surface plasmon resonance probe

2021 ◽  
pp. 113549
Author(s):  
Jia-Huan Qu ◽  
Bernd Peeters ◽  
Filip Delport ◽  
Karen Vanhoorelbeke ◽  
Jeroen Lammertyn ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Gold Nanoparticle ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Fiber Optic ◽  
Multiplexed Biosensing

A gold-nanoparticle-enhanced immune sensor based on fiber optic interferometry

2008 ◽  
Vol 19 (34) ◽  
pp. 345501 ◽  
Author(s):  
Yuan-Tai Tseng ◽  
Yun-Ju Chuang ◽  
Yi-Chien Wu ◽  
Chung-Shi Yang ◽  
Mu-Chun Wang ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Fiber Optic

scholarly journals Fiber optic index sensor enhanced by gold nanoparticle assembly on long period grating

Optik ◽  
2017 ◽  
Vol 132 ◽  
pp. 445-449 ◽  
Author(s):  
Fei Tian ◽  
Xiangzhi Li ◽  
Jiri Kanka ◽  
Henry Du
Keyword(s):  
Gold Nanoparticle ◽  
Fiber Optic ◽  
Nanoparticle Assembly ◽  
Long Period Grating ◽  
Long Period

scholarly journals Gold Nanoparticle-Enhanced Detection of DNA Hybridization by a Block Copolymer-Templating Fiber-Optic Localized Surface Plasmon Resonance Biosensor

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 616
Author(s):  
Mengdi Lu ◽  
Ming Lin ◽  
Fang Wang ◽  
Yang Zhang ◽  
Wei Peng
Keyword(s):  
Surface Plasmon Resonance ◽  
Block Copolymer ◽  
Gold Nanoparticle ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Localized Surface Plasmon Resonance ◽  
Fiber Optic ◽  
Localized Surface Plasmon ◽  
Decay Length ◽  
Self Assembled

To overcome low surface coverage and aggregation of particles, which usually restricts the sensitivity and resolution of conventional localized surface plasmon resonance (LSPR) fiber-optic sensors, we propose a simple self-assembled templating technique that uses a nanometer thickness block copolymer (BCP) layer of poly(styrene-b-4-vinylpyridine) to form a 33 nm gold nanoparticle (AuNP) monolayer with high uniformity and density for LSPR sensing. The LSPR resonance wavelength for this PS-b-P4VP templated methodology is 592 nm and its refractive index sensitivity is up to 386.36 nm/RIU, both of which are significantly improved compared to those of conventional LSPR techniques. Calibrated by a layer-by-layer polyelectrolyte deposition procedure, the decay length of this LSPR sensor is calculated to be 78 nm, which is lower than other traditional self-assembled LSPR sensors. Furthermore, hybridization between target ssDNA, which is linked with capture ssDNA on the LSPR biosensor and DNA–AuNP conjugates, leads to a low detection limit of 67 pM. These enhanced performances are significant and valuable for high-sensitivity and cost-effective LSPR biosensing applications.

Combining gold nanoparticle antennas with single-molecule fluorescence resonance energy transfer (smFRET) to study DNA hairpin dynamics

Nanoscale ◽  
2018 ◽  
Vol 10 (14) ◽  
pp. 6611-6619 ◽  
Author(s):  
Jinyong Hu ◽  
Meiyan Wu ◽  
Li Jiang ◽  
Zhensheng Zhong ◽  
Zhangkai Zhou ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Gold Nanoparticle ◽  
Fluorescence Resonance Energy Transfer ◽  
Single Molecule ◽  
Fluorescence Enhancement ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Dna Hairpin ◽  
Single Molecule Fluorescence ◽  
Fluorescence Resonance

Gold nanoparticle antennas as a promising platform not only for fluorescence enhancement but also for the studies of single-molecule kinetics.

Imaging and diffraction modes in Scanning Transmission Electron Microscopy

1986 ◽  
Vol 44 ◽  
pp. 684-687
Author(s):  
J. M. Cowley ◽  
R. Glaisher ◽  
J. A. Lin ◽  
H.-J. Ou
Keyword(s):  
Scanning Transmission Electron Microscopy ◽  
High Efficiency ◽  
Fiber Optic ◽  
Image Intensifier ◽  
Detector System ◽  
Detector Plane ◽  
Secondary Electrons ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Special Detector

Some of the most important applications of STEM depend on the variety of imaging and diffraction made possible by the versatility of the detector system and the serial nature, of the image acquisition. A special detector system, previously described, has been added to our STEM instrument to allow us to take full advantage of this versatility. In this, the diffraction pattern in the detector plane may be formed on either of two phosphor screens, one with P47 (very fast) phosphor and the other with P20 (high efficiency) phosphor. The light from the phosphor is conveyed through a fiber-optic rod to an image intensifier and TV system and may be photographed, recorded on videotape, or stored digitally on a frame store. The P47 screen has a hole through it to allow electrons to enter a Gatan EELS spectrometer. Recently a modified SEM detector has been added so that high resolution (10Å) imaging with secondary electrons may be used in conjunction with other modes.

Synthesis, performance and growth mechanism of silver nanoparticle coated SERS fiber probe

2019 ◽  
Vol 107 (3) ◽  
pp. 305
Author(s):  
Mengmei Geng ◽  
Yuting Long ◽  
Tongqing Liu ◽  
Zijuan Du ◽  
Hong Li ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Absorption Spectrum ◽  
Reaction Time ◽  
Growth Mechanism ◽  
Fiber Optic ◽  
Fiber Optic Probe ◽  
Visible Absorption ◽  
Fiber Probe ◽  
Surface Enhanced Raman ◽  
Optic Probe

Surface-enhanced Raman Scattering (SERS) fiber probe provides abundant interaction area between light and materials, permits detection within limited space and is especially useful for remote or in situ detection. A silver decorated SERS fiber optic probe was prepared by hydrothermal method. This method manages to accomplish the growth of silver nanoparticles and its adherence on fiber optic tip within one step, simplifying the synthetic procedure. The effects of reaction time on phase composition, surface plasmon resonance property and morphology were investigated by X-ray diffraction analysis (XRD), ultraviolet-visible absorption spectrum (UV-VIS absorption spectrum) and scanning electron microscope (SEM). The results showed that when reaction time is prolonged from 4–8 hours at 180 °C, crystals size and size distribution of silver nanoparticles increase. Furthermore, the morphology, crystal size and distribution density of silver nanoparticles evolve along with reaction time. A growth mechanism based on two factors, equilibrium between nucleation and growth, and the existence of PVP, is hypothesized. The SERS fiber probe can detect rhodamin 6G (R6G) at the concentration of 10−6 M. This SERS fiber probe exhibits promising potential in organic dye and pesticide residue detection.

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