scholarly journals Fluorescent Aptamer Immobilization on Inverse Colloidal Crystals

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4326 ◽  
Author(s):  
Andrea Chiappini ◽  
Laura Pasquardini ◽  
Somayeh Nodehi ◽  
Cristina Armellini ◽  
Nicola Bazzanella ◽  
...  
Keyword(s):  
Band Gap ◽  
Photonic Band Gap ◽  
Transmission Band ◽  
Optical Quality ◽  
Dna Aptamer ◽  
Inverse Opal ◽  
High Optical Quality ◽  
Inverse Opals ◽  
Assembly Method

In this paper, we described a versatile two steps approach for the realization of silica inverse opals functionalized with DNA-aptamers labelled with Cy3 fluorophore. The co-assembly method was successfully employed for the realization of high quality inverse silica opal, whilst the inverse network was functionalized via epoxy chemistry. Morphological and optical assessment revealed the presence of large ordered domains with a transmission band gap depth of 32%, after the functionalization procedure. Finite Difference Time-Domain (FDTD) simulations confirmed the high optical quality of the inverse opal realized. Photoluminescence measurements evidenced the effective immobilization of DNA-aptamer molecules labelled with Cy3 throughout the entire sample thickness. This assumption was verified by the inhibition of the fluorescence of Cy3 fluorophore tailoring the position of the photonic band gap of the inverse opal. The modification of the fluorescence could be justified by a variation in the density of states (DOS) calculated by the Plane Wave Expansion (PWE) method. Finally, the development of the aforementioned approach could be seen as proof of the concept experiment, suggesting that this type of system may act as a suitable platform for the realization of fluorescence-based bio-sensors.

Band Gap Change of Bulk ZnSxSe1–x Semiconductors by Controlling the Sulfur Content

2018 ◽  
Vol 63 (1) ◽  
pp. 33 ◽  
Author(s):  
O. G. Trubaieva ◽  
A. I. Lalayants ◽  
M. A. Chaika
Keyword(s):  
Band Gap ◽  
Sulfur Content ◽  
Optical Band Gap ◽  
Optical Quality ◽  
Bulk Crystals ◽  
High Optical Quality ◽  
New States ◽  
Stockbarger Method

ZnSxSe1−x bulk crystals were grown by the Bridgman–Stockbarger method. The transmittance of different samples in the range from 67% to 56% at la = 1100 nm (for 4-mm samples) indicates a high optical quality of the crystals. No new states were revealed at the sulfur incorporation, and the band gap depends on the composition. The optical band gap of ZnSxSe1−x bulk crystals varies from 2.59 to 2.78 eV for direct transitions and from 2.49 to 2.70 eV for indirect transitions.

Photo-Induced Photonic Band Gap Shift of SiO2 Inverse Opal Films Infiltrated by Azo-Tolane Copolymer

2010 ◽  
Vol 516 (1) ◽  
pp. 174-181
Author(s):  
Tomomi Shirota ◽  
Masaki Moritsugu ◽  
Shoichi Kubo ◽  
Tomonari Ogata ◽  
Takamasa Nonaka ◽  
...  
Keyword(s):  
Band Gap ◽  
Photonic Band Gap ◽  
Inverse Opal ◽  
Photonic Band

scholarly journals Al2O3/TiO2 inverse opals from electrosprayed self-assembled templates

2018 ◽  
Vol 9 ◽  
pp. 216-223 ◽  
Author(s):  
Arnau Coll ◽  
Sandra Bermejo ◽  
David Hernández ◽  
Luís Castañer
Keyword(s):  
Three Dimensional ◽  
Optical Quality ◽  
High Optical Quality ◽  
Inverse Opals ◽  
Large Size ◽  
Fabrication Errors ◽  
Supporting Layer ◽  
Higher Temperature ◽  
Self Assembled ◽  
High Dielectric

The fabrication of high optical quality inverse opals is challenging, requiring large size, three-dimensional ordered layers of high dielectric constant ratio. In this article, alumina/TiO2–air inverse opals with a 98.2% reflectivity peak at 798 nm having an area of 2 cm2 and a thickness of 17 µm are achieved using a sacrificial self-assembled structure of large thickness, which was produced with minimum fabrication errors by means of an electrospray technique. Using alumina as the first supporting layer enables the deposition of TiO2 at a higher temperature, therefore providing better optical quality.

Temperature dependence of the band gap of high optical quality CdS:Dy thin films based on exciton spectra

2018 ◽  
Vol 5 (12) ◽  
pp. 125902 ◽  
Author(s):  
Yu P Gnatenko ◽  
P M Bukivskij ◽  
M S Furier ◽  
A P Bukivskii ◽  
A S Opanasyuk
Keyword(s):  
Thin Films ◽  
Temperature Dependence ◽  
Band Gap ◽  
Optical Quality ◽  
High Optical Quality

The modification of upconversion emissions by photonic band gap in β-NaYF4: Yb3+, Tm3+ inverse opal structures

2018 ◽  
Vol 194 ◽  
pp. 420-423 ◽  
Author(s):  
Yongsheng zhu ◽  
Yanan Ji ◽  
Qiang Chen ◽  
Chun Wang ◽  
Xuemei Lu ◽  
...  
Keyword(s):  
Band Gap ◽  
Photonic Band Gap ◽  
Inverse Opal ◽  
Upconversion Emissions ◽  
Photonic Band

The MBE Growth and Optical Quality of BaTiO3 and SrTiO3Thin Films on MgO

1994 ◽  
Vol 341 ◽  
Author(s):  
R. A. McKee ◽  
F. J. Walker ◽  
E. D. Specht ◽  
K. B. Alexander
Keyword(s):  
Optical Loss ◽  
Wavelength Dependence ◽  
Optical Quality ◽  
High Quality ◽  
High Optical Quality ◽  
Mbe Growth ◽  
Cell Height ◽  
Out Of Plane ◽  
Loss Coefficients

AbstractHigh quality epitaxial BaTiO3 and SrTiO3 have been grown on MgO, stabilized at a one unit cell height, and grown to film thicknesses of 0.5 - 0.7 μm. These relatively thick films remain adherent when thermally cycled between growth temperatures and room temperature, are crack free with high optical quality, and have both in-plane and out-of-plane X-ray rocking curves of 0.3–0.5°. These films have been grown using molecular beam epitaxy (MBE) methods starting with the TiO2 layer of the perovskite structure. The TiO2-Iayer/MgO interface uniquely satisfies electrostatic requirements for perovskite heteroepitaxy and provides the template structure that leads to the high quality films that are obtained. Wavelength dependence of optical loss has been characterized between 475 nm and 705 nm with loss coefficients < 1dB/cm being obtained at the He-Ne wavelength.

scholarly journals Printability of papers recycled from toner and inkjet-printed papers after deinking and recycling processes

2017 ◽  
Vol 16 (2) ◽  
pp. 76-82
Author(s):  
Arif Karademir ◽  
Cem Aydemir ◽  
Dogan Tutak ◽  
Raja Aravamuthan
Keyword(s):  
High Efficiency ◽  
Color Change ◽  
Paper Industry ◽  
Optical Quality ◽  
Recycled Paper ◽  
High Optical Quality ◽  
Contemporary World ◽  
Before And After ◽  
Better Than

Background: In our contemporary world, while part of the fibers used in the paper industry is obtained from primary fibers such as wood and agricultural plants, the rest is obtained from secondary fibers from waste papers. To manufacture paper with high optical quality from fibers of recycled waste papers, these papers require deinking and bleaching of fibers at desired levels. High efficiency in removal of ink from paper mass during recycling, and hence deinkability, are especially crucial for the optical and printability quality of the ultimate manufactured paper. Methods: In the present study, deinkability and printability performance of digitally printed paper with toner or inkjet ink were compared for the postrecycling product. To that end, opaque 80 g/m2 office paper was digitally printed under standard printing conditions with laser toner or inkjet ink; then these sheets of paper were deinked by a deinking process based on the INGEDE method 11 p. After the deinking operation, the optical properties of the obtained recycled handsheets were compared with unprinted (reference) paper. Then the recycled paper was printed on once again under the same conditions as before with inkjet and laser printers, to monitor and measure printing color change before and after recycling, and differences in color universe. Results: Recycling and printing performances of water-based inkjet and toner-based laser printed paper were obtained. The outcomes for laser-printed recycled paper were better than those for inkjet-printed recycled paper. Conclusions: Compared for luminosity Y, brightness, CIE a* and CIE b* values, paper recycled from laser-printed paper exhibited higher value than paper recycled from inkjet-printed paper.

Sign in / Sign up

Export Citation Format

Share Document