scholarly journals CdTe Quantum Dots Embedded in Multidentate Biopolymer Based on Salep: Characterization and Optical Properties

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Ghasem Rezanejade Bardajee ◽  
Zari Hooshyar
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Water Soluble ◽  
Cdte Quantum Dots ◽  
Fluorescence Emission Spectra ◽  
Cdte Qds ◽  
Transmission Electron ◽  
Ft Ir

This paper describes a novel method for surface modification of water soluble CdTe quantum dots (QDs) by using poly(acrylic acid) grafted onto salep (salep-g-PAA) as a biopolymer. As-prepared CdTe-salep-g-PAA QDs were characterized by Fourier transform infrared (FT-IR) spectrum, thermogravimetric (TG) analysis, and transmission electron microscopy (TEM). The absorption and fluorescence emission spectra were measured to investigate the effect of salep-g-PAA biopolymer on the optical properties of CdTe QDs. The results showed that the optical properties of CdTe QDs were significantly enhanced by using salep-g-PAA-based biopolymer.

scholarly journals The sequential structure of tripyridiniumylporphyrin pendants in water-soluble copolymers and their association behaviour with tetrasulfonatophenylporphyrin guests: UV-vis absorption and fluorescence emission spectra study

RSC Advances ◽  
2018 ◽  
Vol 8 (62) ◽  
pp. 35759-35767 ◽  
Author(s):  
Ke-Wei Ding ◽  
Tao-Qi Li ◽  
Zhong-Xue Ge ◽  
Jian-Hua Bu ◽  
Ying Liu
Keyword(s):  
Fluorescence Emission ◽  
Emission Spectra ◽  
Water Soluble ◽  
Fluorescence Emission Spectra ◽  
Sequential Structure

Water-soluble random and micro-blocky copolymers P(ZnTrMPyP-AM) were prepared and the porphyrin pendants on them associate with anionic porphyrins in different manner.

scholarly journals Preparation of 1, 3, 6, 8-Pyrenesulfonic Acid Tetrasodium Salt Dye-Doped Silica Nanoparticles and Their Application in Water-Based Anti-Counterfeit Ink

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4074
Author(s):  
Liyong Jiao ◽  
Mengnan Zhang ◽  
Houbin Li
Keyword(s):  
Silica Nanoparticles ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Heat Stability ◽  
Cationic Polyelectrolyte ◽  
Water Soluble ◽  
Fluorescence Emission Spectra ◽  
Water Based ◽  
Waterborne Emulsion

In order to improve the luminescent stability of water-based anti-counterfeit ink, a new fluorescent material is prepared by doping dye into silica nanoparticles. Water soluble anionic dye 1, 3, 6, 8-pyrenesulfonic acid sodium salt (PTSA) is selected as the dopant. In this work, PTSA is successfully trapped into silica nanoparticles (SiNPs) by the reverse microemulsion method using cationic polyelectrolyte poly (dimethyl diallyl ammonium chloride; PDADMAC) as a bridge. The UV absorption spectra, fluorescence emission spectra and fluorescent decay curves are used to describe the luminescent properties of the PTSA-doped silica nanoparticles (PTSA-SiNPs). In addition, the as-prepared PTSA-SiNPs and polyurethane waterborne emulsion are used to prepare water-based anti-counterfeit ink, and fluorescent patterns are successfully printed through screen-printing. The samples printed by the ink exhibit desirable fluorescence properties, heat stability, robust photostability, and a fluorescent anti-counterfeit effect, which makes the PTSA-SiNPs promising luminescent materials for anti-counterfeit applications.

Tuning optical properties of water-soluble CdTe quantum dots for biological applications

2017 ◽  
Vol 19 (2) ◽  
Author(s):  
Anne S. Schulze ◽  
Isabella Tavernaro ◽  
Friederike Machka ◽  
Olga Dakischew ◽  
Katrin S. Lips ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Water Soluble ◽  
Cdte Quantum Dots ◽  
Biological Applications

A New Schiff’s Base Fluorescent Sensor for the Selective Detection of Mercury Ion

2011 ◽  
Vol 239-242 ◽  
pp. 1105-1108 ◽  
Author(s):  
Xue Mei Wang ◽  
Hua Yan ◽  
Yong Chen ◽  
He Bin Bao
Keyword(s):  
Fluorescent Sensor ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Mercury Ion ◽  
Fluorescence Measurement ◽  
Fluorescence Emission Spectra ◽  
H Nmr ◽  
Complex Process ◽  
Characteristic Wavelength ◽  
Ft Ir

A new Hg2+-sensing and selective fluorescent sensor, 1-(1-pyrenecarboxaldehyd e)-thiocarbohydrazone, was synthesized and characterized by elemental analysis, FT-IR and 1H NMR spectra. Its fluorescence and recognition properties to the mercury ion were studied by the fluorescence emission spectra. With adding mercury ion into solution, the fluorescence emission intensities at different characteristic wavelength changed continually. Hence the ratiometric fluorescence measurement was used for detecting the complex process. It was found that a 1:1 stoichiometry complex is formed between the mercury ion and the compound with the association constants were 2.04×105 L/mol, respectively. And the detection limits of the mercury ion were 2.52×10-8 mol/L.

A Novel Method for the Preparation of Nanoaggregates of Methoxy Polyethyleneglycol Linked Chitosan

2006 ◽  
Vol 6 (9) ◽  
pp. 2867-2873 ◽  
Author(s):  
Anandrao R. Kulkarni ◽  
Yu-Hsin Lin ◽  
Hsiang-Fa Liang ◽  
Wei-Chun Chang ◽  
Wesley Wei-Wen Hsiao ◽  
...  
Keyword(s):  
Fluorescence Emission ◽  
Emission Spectra ◽  
Gel Permeation Chromatography ◽  
Aqueous Solubility ◽  
Degree Of Substitution ◽  
Critical Aggregation Concentration ◽  
Fluorescence Emission Spectra ◽  
Simple Method ◽  
Ft Ir ◽  
Sensitive Property

In the study, methoxy polyethyleneglycol (MPEG) linked chitosan (PLC) with a different degrees of substitution were prepared using a novel yet simple method in the presence of formaldehyde in a solvent of formic acid and dimethylsulfoxide (DMSO). The obtained PLC was verified by the Fourier transformed infrared (FT-IR) and carbon nuclear magnetic resonance (13C-NMR) spectroscopy and by the gel permeation chromatography (GPC). The aqueous solubility of chitosan increased after chemically linking with MPEG and was found to depend on its degree of substitution. With a proper degree of substitution of MPEG on chitosan, PLC may undergo inter- and/or intra-molecular entanglements to produce nanoaggregates. The critical aggregation concentration (CAC) of PLC was determined by the fluorescence emission spectra of pyrene and was found to be 0.003 mg/ml. Measurements of the size distribution and zeta potential of the prepared nanoaggregates were carried out using a Zetasizer. The results suggested that as the degree of MPEG substitution increased, the size and polydispersity index of the prepared nanoaggregates decreased. The prepared nanoaggregates showed a pH-sensitive property and thus may be suitable for the development of drug delivery devices for tumors.

Application of CdTe Quantum Dots to Development Fingerprints on Adhesive Surfaces

2011 ◽  
Vol 694 ◽  
pp. 874-880 ◽  
Author(s):  
Rui Qin Yang ◽  
Yong Gang Wang ◽  
Bin Bin Xia ◽  
Yan Ji Wang ◽  
Jian Jun Liu
Keyword(s):  
Quantum Dots ◽  
Fluorescence Spectroscopy ◽  
Fluorescence Intensity ◽  
Development Time ◽  
Ph Value ◽  
Development Rate ◽  
Water Soluble ◽  
Cdte Quantum Dots ◽  
Cdte Qds ◽  
Effective Development

Water-soluble fluorescent CdTe quantum dots were synthesized using TGA (Thiolglycolic acid) as the stabilizer and characterized by fluorescence spectroscopy. This fluorescent material was applied to development fingerprints deposited on the sticky side of adhesives. The development conditions such as development time, temperature and pH value of QDs solution were investigated. The comparison experimental with traditional methods and development rate were also studied. The results show that this material exhibited strong visible fluorescence under excitation at 365 nm. CdTe QDs can detect fingerprints on different adhesive surfaces. In addition, the development rate of fingerprints on the adhesive side of cellulose tape was discussed and the effective development rate for 30-days-aged fingerprints can reach to 72%. Furthermore, the developed fingerprints have higher and stable fluorescence intensity, weaker background interference and better contrast between fingerprints and the substrate. CdTe QDs is a promising reagent for fingerprints development on adhesive surfaces.

Facile Synthesis and Properties of Aqueous CdTe Quantum Dots for High-Sensitive Copper (II) Ion Detection

NANO ◽  
2017 ◽  
Vol 12 (12) ◽  
pp. 1750151 ◽  
Author(s):  
Yue Zheng ◽  
Hengshan Tang ◽  
Xiaoyu Wang ◽  
Ya Di ◽  
Kunling Lu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Limit Of Detection ◽  
Tap Water ◽  
High Sensitivity ◽  
Cdte Quantum Dots ◽  
Reaction Conditions ◽  
One Pot ◽  
Sensing System ◽  
Cdte Qds ◽  
Transmission Electron

The synthesis of aqueous MPA-capped CdTe quantum dots (QDs) via a facile one-pot route was developed. The particle size, optical properties and crystal structure of the as-synthesis QDs were investigated by transmission electron microscopy (TEM), Fourier transform infrared (FTIR), UV-vis absorption and photoluminescence (PL) spectra, respectively. Meanwhile, the effect of reaction conditions, including reaction time, pH and the quantity of sodium citrate (SC) on the growth of CdTe QDs were discussed. Then, the obtained CdTe QDs were successfully used for the detection of trace Cu[Formula: see text] with high sensitivity and excellent selectivity. The fluorescence intensity of CdTe QDs with Cu[Formula: see text] concentration showed a linear relationship in the range from [Formula: see text] mol/L to [Formula: see text][Formula: see text]mol/L. The correlation coefficient (R) is 0.9980 and limit of detection (LOD) is [Formula: see text][Formula: see text]mol/L. Moreover, the concentration of Cu[Formula: see text] in tap water samples was determined based on this sensing system and the recovery test was satisfactory.

Hydrothermal-Based Synthesis of CdS/ZnO Quantum Dots

2014 ◽  
Vol 875-877 ◽  
pp. 362-365
Author(s):  
Xian Lan Chen ◽  
Wei Liu ◽  
Ju Cheng Zhang ◽  
Qing Shan Pan ◽  
Du Shu Huang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ph Value ◽  
Synthesis Method ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Hydrothermal Condition ◽  
Zinc Ion ◽  
Fluorescence Emission Spectra ◽  
Zno Quantum Dots ◽  
Zno Qds

In this article, the CdS and CdS/ZnO quantum dots (QDs) were prepared by hydrothermal synthesis method. The optimal reaction conditions of CdS/ZnO QDs were obtained through experiment as follows: the pH value of solution is 10.0, the reaction temperature is 140 °C and reaction time is 24 h. While the pH value is up to10.0, Zinc ion exist in solution with Zn (OH)2 and Zn (OH)42-, which is apt to adsorb on the surface of CdS, and form to ZnO shell under the hydrothermal condition, so CdS/ZnO QDs are synthesized successfully. The photographic images and fluorescence emission spectra results showed that the colour and the peak position of fluorescence spectra of CdS/ZnO QDs is consistent with literatures, which confirming the feasibility of this method.

Synthesis and Characterization of CdTe/PAA/P-4-VP Quantum Dots

2009 ◽  
Vol 60-61 ◽  
pp. 141-145
Author(s):  
Yu Hua Jiang ◽  
Ji Mei Zhang ◽  
Zhao Dai ◽  
Shi Chao Xu ◽  
Yong Yin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescence Emission ◽  
Red Shift ◽  
Carboxyl Groups ◽  
Fluorescence Emission Spectrum ◽  
Characteristic Absorption Peak ◽  
Cdte Qds ◽  
Transmission Electron ◽  
The Stability ◽  
Average Size

In this article, a novel kind of nanomaterials called CdTe/PAA/P-4-VP quantum dots (QDs) was studied. CdTe quantum dots were synthesized by mixing CdCl2 solution containing Mercaptopropionic Acid (MPA) stabilizer at pH 9.1 with NaHTe aqueous solution and refluxing 1 h at 96 °C. Then, CdTe solution obtained was adjusted to pH 7.5 by poly(acrylic acid) (PAA) which could provide many carboxyl groups to CdTe QDs. PAA-modified CdTe (CdTe/PAA)solution was transparent during 2 months and the fluorescence of CdTe/PAA was higher than that of CdTe at the same pH, which indicated that PAA increased the stability and fluorescence intension of CdTe QDs. Then poly(4-vinylpyridine)-coated CdTe/PAA QDs (CdTe/PAA/P-4-VP QDs) were prepared after 4-VP was polymerized on the surface of CdTe/PAA nanoparticles by using N, N'-Methylenebisacrylamide as crosslinker and potassium persulfate as initiator. The parallel experiment in which PAA was replaced by HCl was also arranged and CdTe/P-4-VP QDs was gained. Fluorescence emission spectrum (FE), transmission electron microscope (TEM), and infrared spectrum (IR) were used to characterize CdTe/PAA/P-4-VP and CdTe/P-4-VP QDs. The FE spectrum of CdTe/PAA/P-4-VP QDs had an obviously red shift compared with that of CdTe QDs while the red shift in FE spectrum of CdTe/P-4-VP QDs was not obvious, which indicated that PAA played an important role in the synthesis of P-4-VP-coated CdTe QDs. The fluorescence of CdTe/PAA/P-4-VP QDs was one times higher than that of CdTe QDs, which suggested the advantage of CdTe/PAA/P-4-VP QDs in fluorescence application. TEM photos showed that the average size of CdTe/PAA/P-4-VP QDs was 13.3nm. The IR spectrum of CdTe/PAA/P-4-VP QDs showed that characteristic absorption peak of carboxyl groups from PAA or/and MPA was wide and other absorption peaks of CdTe/PAA/P-4-VP QDs were the same with that of 4-VP which confirmed that P-4-VP coated CdTe QDs.

Influence of trimethoxy-substituted positions on fluorescence of heteroaryl chalcone derivatives

2011 ◽  
Vol 65 (6) ◽  
Author(s):  
Thitipone Suwunwong ◽  
Suchada Chantrapromma ◽  
Hoong-Kun Fun
Keyword(s):  
Aldol Condensation ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Fluorescent Properties ◽  
Fluorescence Emission Spectra ◽  
Strong Emission ◽  
X Ray ◽  
Methoxy Groups ◽  
Phenyl Rings ◽  
Ft Ir

AbstractThree series of heteroaryl chalcones, (E)-1-(2-pyridyl)-3-(X)prop-2-en-1-one (Ia-Ic), (E)-1-(2-thienyl)-3-(X)prop-2-en-1-one (IIa-IIc), and (E)-1-(2-furyl)-3-(X)prop-2-en-1-one (IIIa-IIIc), where X = 2,4,5-trimethoxyphenyl (for series a), X = 2,4,6-trimethoxyphenyl (for series b), and X = 3,4,5-trimethoxyphenyl (for series c) were synthesised using basic catalysed aldol condensation and characterised using 1H NMR and FT-IR spectroscopies. Compound IIa was also characterised by single crystal X-ray analysis. The absorption and fluorescence emission spectra of these compounds revealed that the absorption and fluorescence depended on the heterocycle rings and trimethoxysubstituted phenyl rings linked to the enone system. The position of methoxy groups substantially affected the fluorescent properties. Compounds Ia-IIIa containing the 2,4,5-trimethoxyphenyl moiety exhibited the red-shift phenomenon and strong emission fluorescence.

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