scholarly journals Sulfur-free synthesis of size tunable rickardite (Cu 3− x Te 2 ) spheroids and planar squares

2019 ◽  
Vol 6 (2) ◽  
pp. 181602 ◽  
Author(s):  
Guanwei Jia ◽  
Chengduo Wang ◽  
Peixu Yang ◽  
Jinhui Liu ◽  
Weidong Zhang ◽  
...  
Keyword(s):  
Stearic Acid ◽  
Surface Plasmons ◽  
Optical Materials ◽  
Near Infrared ◽  
Band Gaps ◽  
Absolute Concentration ◽  
Size Dependent ◽  
Novel Synthesis ◽  
Direct Energy ◽  
Shape And Size

We report a novel synthesis of monodisperse samples of copper telluride with crystallinity and stoichiometry corresponding to forms of rickardite, Cu 3− x Te 2 ( x < 1). This synthesis makes use of a ligand balanced reaction to allow control over shape and size by varying the relative and absolute concentration of oleylamine to stearic acid. The rickardite samples presented here display size dependent plasmon peaks in the near infrared and direct energy band gaps between 1.7 and 2.3 eV. As such they may find utility in photovoltaic, thermoelectric or as novel optical materials for study of surface plasmons.

A New Study of Shape and Size-dependent Properties of Nanocrystals Utilizing the Fractional Fourier Transform

2020 ◽  
Vol 5 (2) ◽  
pp. 165-174
Author(s):  
Aeshah Salem
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Surface Area ◽  
Fractional Fourier Transform ◽  
Fourier Transform Infrared ◽  
Chemical Dynamics ◽  
Znse Nanoparticles ◽  
Size Dependent ◽  
Shape And Size

Background: Possessions of components, described by their shape and size (S&S), are certainly attractive and has formed the foundation of the developing field of nanoscience. Methods: Here, we study the S&S reliant on electronic construction and possession of nanocrystals by semiconductors and metals to explain this feature. We formerly considered the chemical dynamics of mineral nanocrystals that are arranged according to the S&S not only for the big surface area, but also as a consequence of the considerably diverse electronic construction of the nanocrystals. Results: The S&S of models, approved by using the Fractional Fourier Transform Infrared Spectroscopy (FFTIR), indicate the construction of CdSe and ZnSe nanoparticles. Conclusion: In order to study the historical behavior of the nanomaterial in terms of S&S and estimate further results, the FFTIR was used to solve this project.

Far-red/near-infrared fluorescent conjugated polymer nanoparticles with size-dependent chirality and cell imaging applications

2015 ◽  
Vol 6 (21) ◽  
pp. 3962-3969 ◽  
Author(s):  
Chunhui Dai ◽  
Dongliang Yang ◽  
Wenjie Zhang ◽  
Biqing Bao ◽  
Yixiang Cheng ◽  
...  
Keyword(s):  
Conjugated Polymer ◽  
Near Infrared ◽  
Cell Imaging ◽  
Polymer Nanoparticles ◽  
Size Dependent ◽  
Conjugated Polymer Nanoparticles ◽  
Nanoparticle Sizes

We prepared a series of novel chiral far-red/near-infrared fluorescent CPNs with different nanoparticle sizes, which show size-dependent chirality and are successfully employed for cell imaging.

scholarly journals Optical properties of spray pyrolysis deposited Cds:Al thin films

2015 ◽  
Vol 39 (1) ◽  
pp. 25-30 ◽  
Author(s):  
A Hasnat Rubel ◽  
J Podder
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spray Pyrolysis ◽  
Near Infrared ◽  
Visible Region ◽  
Cadmium Sulphide ◽  
Infrared Region ◽  
Photo Detectors ◽  
Direct Energy ◽  
Academy Of Sciences

Aluminium doped cadmium sulphide thin films were prepared on glass substrate using aqueous solution of cadmium sulphide and thiourea salts by spray pyrolysis deposition (SPD) technique. Its optical properties were analyzed as a function of doping concentration. The direct energy band-gap of Al-doped CdS films was estimated in the range of 2.25 to 2.48 eV. The optical spectra of Cd1-xAlxS ternary system exhibit high absorption near visible region and transmission throughout the near-infrared region (600 - 1200 nm). Thus so obtained hetero-junction films are suitable for fabrication of photo detectors, solar cells and other optoelectronics devices.Journal of Bangladesh Academy of Sciences, Vol. 39, No. 1, 25-30, 2015

Size-Dependent Ag2S Nanodots for Second Near-Infrared Fluorescence/Photoacoustics Imaging and Simultaneous Photothermal Therapy

ACS Nano ◽  
2017 ◽  
Vol 11 (2) ◽  
pp. 1848-1857 ◽  
Author(s):  
Tao Yang ◽  
Yong’an Tang ◽  
Ling Liu ◽  
Xiaoyan Lv ◽  
Qiaoli Wang ◽  
...  
Keyword(s):  
Photothermal Therapy ◽  
Near Infrared ◽  
Near Infrared Fluorescence ◽  
Size Dependent

scholarly journals Two-photon excited deep-red and near-infrared emissive organic co-crystals

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yu Wang ◽  
Huang Wu ◽  
Penghao Li ◽  
Su Chen ◽  
Leighton O. Jones ◽  
...  
Keyword(s):  
Cross Sections ◽  
Optical Materials ◽  
Near Infrared ◽  
Infrared Emission ◽  
Photon Absorption ◽  
Electromagnetic Spectrum ◽  
Absorption Bands ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Near Infrared Emission

Abstract Two-photon excited near-infrared fluorescence materials have garnered considerable attention because of their superior optical penetration, higher spatial resolution, and lower optical scattering compared with other optical materials. Herein, a convenient and efficient supramolecular approach is used to synthesize a two-photon excited near-infrared emissive co-crystalline material. A naphthalenediimide-based triangular macrocycle and coronene form selectively two co-crystals. The triangle-shaped co-crystal emits deep-red fluorescence, while the quadrangle-shaped co-crystal displays deep-red and near-infrared emission centered on 668 nm, which represents a 162 nm red-shift compared with its precursors. Benefiting from intermolecular charge transfer interactions, the two co-crystals possess higher calculated two-photon absorption cross-sections than those of their individual constituents. Their two-photon absorption bands reach into the NIR-II region of the electromagnetic spectrum. The quadrangle-shaped co-crystal constitutes a unique material that exhibits two-photon absorption and near-infrared emission simultaneously. This co-crystallization strategy holds considerable promise for the future design and synthesis of more advanced optical materials.

scholarly journals Shape- and size dependent piezoelectric properties of monolayer hexagonal boron nitride nanosheets

2020 ◽  
Vol 2 (1) ◽  
pp. 470-477
Author(s):  
Yang Nan ◽  
Dan Tan ◽  
Junqi Zhao ◽  
Morten Willatzen ◽  
Zhong Lin Wang
Keyword(s):  
Boron Nitride ◽  
Piezoelectric Properties ◽  
Hexagonal Boron Nitride ◽  
Symmetry Analysis ◽  
Size Dependent ◽  
Boron Nitride Nanosheets ◽  
Shape Tuning ◽  
Shape And Size

A symmetry analysis of 2D BN nanosheet geometries is carried out. We demonstrate effective shape tuning of piezoelectric properties.

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