scholarly journals Silicon-Vacancy Nanodiamonds as High Performance Near-Infrared Emitters for Live-Cell Dual-Color Imaging and Thermometry

2022 ◽  
Author(s):  
Weina Liu ◽  
Md Noor A Alam ◽  
Yan Liu ◽  
Viatcheslav N. Agafonov ◽  
Haoyuan Qi ◽  
...  
Keyword(s):  
High Performance ◽  
Near Infrared ◽  
Drug Carrier ◽  
Infrared Region ◽  
Live Cell ◽  
Metal Catalyst ◽  
Color Imaging ◽  
Silicon Vacancy ◽  
Dual Color ◽  
First Time

Nanodiamonds (NDs) with color centers are excellent emitters for various bioimaging and quantum biosensing applications. In our work, we explored new applications of NDs with silicon-vacancy centers (SiV) obtained by high-pressure high-temperature (HPHT) synthesis based on metal-catalyst-free growth. They are coated with a polypeptide biopolymer which is essential for efficient cellular uptake. The unique optical properties of NDs with SiV are their high photostability and narrow emission in the near-infrared region. Our results demonstrate for the first time that NDs with SiV allow live-cell dual-color imaging and intracellular tracking. Also, intracellular thermometry as well as challenges associated with SiV atomic defects in NDs are investigated and discussed for the first time. NDs with SiV nanoemitters provide new avenues for live-cell bioimaging, diagnostic (SiV as a nanosized thermometer), and theranostic (nanodiamonds as drug carrier) applications.

scholarly journals Silicon-Vacancy Nanodiamonds as High Performance Near-Infrared Emitters for Live-Cell Dual-Color Imaging

2021 ◽  
Author(s):  
Weina Liu ◽  
Yan Liu ◽  
Viatcheslav N. Agafonov ◽  
Haoyuan Qi ◽  
Kaloian Koynov ◽  
...  
Keyword(s):  
High Performance ◽  
Near Infrared ◽  
Drug Carrier ◽  
Infrared Region ◽  
Live Cell ◽  
Metal Catalyst ◽  
Color Imaging ◽  
Silicon Vacancy ◽  
Dual Color ◽  
High Temperature Synthesis

Intracellular imaging is limited by a short bleaching time of fluorescent molecules and particles. In our work we used nanodiamonds with silicon-vacancy centers (SiV) obtained by high-pressure high-temperature synthesis based on metal-catalyst-free growth. They are coated with a polypeptide biopolymer that allows efficient cellular uptake. Our results demonstrate that high photostability and narrow emission in the near-infrared region of nanodiamonds with SiV allow live-cell dual-color imaging and intracellular tracking. Such a system has broad potential applications, which is not limited to live-cell bioimaging, but also include diagnostic (SiV as a nanosized thermometer) and theranostic (nanodiamonds as drug carrier).<br>

scholarly journals Silicon-Vacancy Nanodiamonds as High Performance Near-Infrared Emitters for Live-Cell Dual-Color Imaging

2021 ◽  
Author(s):  
Weina Liu ◽  
Yan Liu ◽  
Viatcheslav N. Agafonov ◽  
Haoyuan Qi ◽  
Kaloian Koynov ◽  
...  
Keyword(s):  
High Performance ◽  
Near Infrared ◽  
Drug Carrier ◽  
Infrared Region ◽  
Live Cell ◽  
Metal Catalyst ◽  
Color Imaging ◽  
Silicon Vacancy ◽  
Dual Color ◽  
High Temperature Synthesis

Intracellular imaging is limited by a short bleaching time of fluorescent molecules and particles. In our work we used nanodiamonds with silicon-vacancy centers (SiV) obtained by high-pressure high-temperature synthesis based on metal-catalyst-free growth. They are coated with a polypeptide biopolymer that allows efficient cellular uptake. Our results demonstrate that high photostability and narrow emission in the near-infrared region of nanodiamonds with SiV allow live-cell dual-color imaging and intracellular tracking. Such a system has broad potential applications, which is not limited to live-cell bioimaging, but also include diagnostic (SiV as a nanosized thermometer) and theranostic (nanodiamonds as drug carrier).<br>

scholarly journals Silicon Vacancy (SiV-) Nanodiamonds as High Performance Near Infrared Emitters for Live Cell Imaging and Particle Tracking

2021 ◽  
Author(s):  
Weina Liu ◽  
Yan Liu ◽  
Viatcheslav N. Agafonov ◽  
Haoyuan Qi ◽  
Kaloian Koynov ◽  
...  
Keyword(s):  
Live Cell Imaging ◽  
High Performance ◽  
Near Infrared ◽  
Cell Imaging ◽  
Infrared Region ◽  
Living Cells ◽  
Silicon Vacancy ◽  
High Pressure High Temperature ◽  
Infrared Emitters ◽  
Narrow Emission

Using tailored nanodiamonds with negatively charged silicon-vacancy (SiV<sup>-</sup>) color centers we performed a series of intracellular experiments. These nanodiamonds with SiV<sup>-</sup> centers (NDs-SiV<sup>-</sup>) were obtained by high-pressure high-temperature (HPHT) synthesis based on metal catalysts-free hydrocarbon HPHT growth. They were coated by a polypeptide biopolymer allowing efficient cellular uptake. High photostability and narrow emission in the near infrared region allows tracking of functionalized NDs-SiV<sup>-</sup> in living cells. The excellent optical properties render NDs-SiV<sup>- </sup>promising nanoemitters for various bioimaging applications. Furthermore, cellular tracking with detailed time, spatial, and spectral information paves the way to intracellular thermometry based on NDs-SiV<sup>-</sup>.

scholarly journals Design and fabrication of a semi-transparent solar cell considering the effect of the layer thickness of MoO3/Ag/MoO3 transparent top contact on optical and electrical properties

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Çağlar Çetinkaya ◽  
Erman Çokduygulular ◽  
Barış Kınacı ◽  
Feyza Güzelçimen ◽  
Yunus Özen ◽  
...  
Keyword(s):  
Solar Cell ◽  
Layer Thickness ◽  
High Performance ◽  
Near Infrared ◽  
Visible Region ◽  
Infrared Region ◽  
Experimental Comparison ◽  
Top Contact ◽  
Cie Chromaticity ◽  
Design And Manufacture

AbstractWe conducted the present study to design and manufacture a semi-transparent organic solar cell (ST-OSC). First, we formed a transparent top contact as MoO3/Ag/MoO3 in a dielectric/metal/dielectric (DMD) structure. We performed the production of an FTO/ZnO/P3HT:PCBM/MoO3/Ag/MoO3 ST-OSC by integrating MoO3/Ag/MoO3 (10/$$d_{m}$$ d m /$$d_{{od}}$$ d od nm) instead of an Ag electrode in an opaque FTO/ZnO/P3HT:PCBM/MoO3/Ag (–/40/130/10/100 nm) OSC, after theoretically achieving optimal values of optical and electrical parameters depending on Ag layer thickness. The transparency decreased with the increase of $$d_{m}$$ d m values for current DMD. Meanwhile, maximum transmittance and average visible transmittance (AVT) indicated the maximum values of over 92% for $$d_{m} ~$$ d m  = 4 and 8 nm, respectively. For ST-OSCs, the absorption and reflectance increased in the visible region by a wavelength of longer than 560 nm and in the whole near-infrared region by increasing $$d_{m}$$ d m up to 16 nm. Moreover, in the CIE chromaticity diagram, we reported a shift towards the D65 Planckian locus for colour coordinates of current ST-OSCs. Electrical analysis indicated the photogenerated current density and AVT values for $$d_{m} = 6$$ d m = 6  nm as 63.30 mA/cm2 and 38.52%, respectively. Thus, the theoretical and experimental comparison of optical and electrical characteristics confirmed that the manufactured structure is potentially conducive for a high-performance ST-OSC.

Chiral carbazole-based porphyrins showing absorption and circular dichroism in the near-infrared region

2020 ◽  
Vol 24 (01n03) ◽  
pp. 247-251
Author(s):  
Chihiro Maeda ◽  
Tadashi Ema
Keyword(s):  
Circular Dichroism ◽  
Near Infrared ◽  
Infrared Region ◽  
Nir Absorption ◽  
Near Infrared Region ◽  
Induced Aggregation ◽  
First Time ◽  
Circular Dichroïsm

Chiral carbazole-based porphyrins were synthesized for the first time via the incorporation of hydrobenzoin units at the thiophene moieties. They showed absorption and circular dichroism in the near-infrared (NIR) region. The NIR absorption was further red-shifted by solvent-induced aggregation.

scholarly journals High-Performance Asymmetric Optical Transmission Based on a Dielectric–Metal Metasurface

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2410
Author(s):  
Wenbing Liu ◽  
Lirong Huang ◽  
Jifei Ding ◽  
Chenkai Xie ◽  
Yi Luo ◽  
...  
Keyword(s):  
High Performance ◽  
Optical Transmission ◽  
Near Infrared ◽  
Contrast Ratio ◽  
Polarized Light ◽  
Infrared Region ◽  
Optical Systems ◽  
Asymmetric Transmission ◽  
Linearly Polarized ◽  
Transmittance Peak

Asymmetric optical transmission plays a key role in many optical systems. In this work, we propose and numerically demonstrate a dielectric–metal metasurface that can achieve high-performance asymmetric transmission for linearly polarized light in the near-infrared region. Most notably, it supports a forward transmittance peak (with a transmittance of 0.70) and a backward transmittance dip (with a transmittance of 0.07) at the same wavelength of 922 nm, which significantly enhances operation bandwidth and the contrast ratio between forward and backward transmittances. Mechanism analyses reveal that the forward transmittance peak is caused by the unidirectional excitation of surface plasmon polaritons and the first Kerker condition, whereas the backward transmittance dip is due to reflection from the metal film and a strong toroidal dipole response. Our work provides an alternative and simple way to obtain high-performance asymmetric transmission devices.

scholarly journals Functionalization of Carbon Nanomaterials for Biomedical Applications

2019 ◽  
Vol 5 (4) ◽  
pp. 72 ◽  
Author(s):  
Liu ◽  
Speranza
Keyword(s):  
Protein Delivery ◽  
Carbon Nanostructures ◽  
Biomedical Applications ◽  
High Performance ◽  
Near Infrared ◽  
Carbon Nanomaterials ◽  
Chemical Species ◽  
Infrared Region ◽  
Highly Sensitive ◽  
Versatile Tool

Over the past decade, carbon nanostructures (CNSs) have been widely used in a variety of biomedical applications. Examples are the use of CNSs for drug and protein delivery or in tools to locally dispense nucleic acids to fight tumor affections. CNSs were successfully utilized in diagnostics and in noninvasive and highly sensitive imaging devices thanks to their optical properties in the near infrared region. However, biomedical applications require a complete biocompatibility to avoid adverse reactions of the immune system and CNSs potentials for biodegradability. Water is one of the main constituents of the living matter. Unfortunately, one of the disadvantages of CNSs is their poor solubility. Surface functionalization of CNSs is commonly utilized as an efficient solution to both tune the surface wettability of CNSs and impart biocompatible properties. Grafting functional groups onto the CNSs surface consists in bonding the desired chemical species on the carbon nanoparticles via wet or dry processes leading to the formation of a stable interaction. This latter may be of different nature as the van Der Waals, the electrostatic or the covalent, the π-π interaction, the hydrogen bond etc. depending on the process and on the functional molecule at play. Grafting is utilized for multiple purposes including bonding mimetic agents such as polyethylene glycol, drug/protein adsorption, attaching nanostructures to increase the CNSs opacity to selected wavelengths or provide magnetic properties. This makes the CNSs a very versatile tool for a broad selection of applications as medicinal biochips, new high-performance platforms for magnetic resonance (MR), photothermal therapy, molecular imaging, tissue engineering, and neuroscience. The scope of this work is to highlight up-to-date using of the functionalized carbon materials such as graphene, carbon fibers, carbon nanotubes, fullerene and nanodiamonds in biomedical applications.

Optoelectronic Double-Wave Method for Remote Control of Vegetable Fiber Moisture

2019 ◽  
pp. 84-96
Author(s):  
O.Kh. Kuldashov ◽  
G.O. Kuldashov ◽  
Z.Yu. Mamasodikova
Keyword(s):  
Remote Control ◽  
High Performance ◽  
Near Infrared ◽  
Block Diagram ◽  
Optoelectronic Device ◽  
Infrared Region ◽  
Wave Method ◽  
Radiation Sources ◽  
Modes Of Processing ◽  
Technological Processing

The paper introduces an optoelectronic two-wave method for remote control of raw cotton moisture. To improve the quality of materials obtained from the fiber, it is necessary to proper organize its storage and comply with the optimal modes of processing technology at all stages of production. Proper storage and selection of technological processing depend on the quality indicators of the fiber, namely its moisture. The study shows that currently used methods and devices for the fiber moisture control do not meet the requirements of rapidity and the required measurement accuracy. We found it relevant to develop highly sensitive, accurate and reliable control devices for raw cotton moisture using new high-performance semiconductor radiation sources in the near infrared region. The paper presents a block diagram of an optoelectronic device for remote control of raw cotton moisture. The device uses LED19-PR with a typical maximum emission wavelength of 1.95 µm as radiation sources. The results of remote control of raw cotton moisture are given.

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