Influence of synthesis parameters on the growth of CdS nanoparticles in colloidal solution and determination of growth kinetics using Karhunen–Loeve decomposition

Barglik-Chory, Ch.; Münster, Arno F.; Strohm, Holger; Remenyi, Ch.; Müller, Gerd

doi:10.1016/s0009-2614(03)00706-1

Cited by 11 publications

(7 citation statements)

References 25 publications

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“…The quantum confinement provides molecular-like discrete energy levels, and the semiconductor band gap exhibits strong size dependence. The influence of various parameters on the band gap position of colloidal CdS nanoparticles has been widely investigated. − In most of these studies the classical experimental design was used whereby one parameter is systematically varied while the others are kept constant, thus disregarding possible parameter interactions. In this paper the Statistical Design of Experiments (DoE) − is used to explore the influence of three synthesis parameters on the band gap energies of CdS nanoparticles, namely, the concentration of the stabilizers cysteine and glutathione, respectively, the concentration of the sulfidation reagent, and the pH value of the sols.…”

Section: Introductionmentioning

confidence: 99%

“…This allows, for example, covalent labeling , of biological moieties such as antibodies and related molecules of biological interest. Selected samples of cysteine- and glutathione-stabilized nanocrystals have been investigated regarding growth kinetics, size, crystal structure, bond attributes, chemical composition, and absorption as well as emission properties, and these characteristics are described elsewhere. ,, In this paper the particles are characterized by UV/VIS absorption spectroscopy, and the position of the semiconductor exciton peak corresponds to the band gap energy and therefore to the particle size. − …”

Section: Introductionmentioning

confidence: 99%

“…Selected samples of cysteine-and glutathione-stabilized nanocrystals have been investigated regarding growth kinetics, size, crystal structure, bond attributes, chemical composition, and absorption as well as emission properties, and these characteristics are described elsewhere. 12,23,24 In this paper the particles are characterized by UV/VIS absorption spectroscopy, and the position of the semiconductor exciton peak corresponds to the band gap energy and therefore to the particle size. [25][26][27][28] We present a systematic investigation of the scope and capability of this preparation method within a wide range of synthesis parameters.…”

Section: Introductionmentioning

confidence: 99%

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Adjustment of the Band Gap Energies of Biostabilized CdS Nanoparticles by Application of Statistical Design of Experiments

et al. 2004

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The colloidal synthesis of CdS nanoparticles with the biostabilizers cysteine and glutathione, respectively, at pH values ranging from 4 to 10 is described. For the adjustment of their UV/Vis absorption properties and hence their band gap energies, the Statistical Design of Experiments (DoE) was used. This method allows the simultaneous variation of the synthesis parameters in a systematic manner, and thereby synergistic interaction effects can be obtained. The band gap energies of the quantum dots can be tuned from 3.32 to 4.26 eV by varying kind and concentration of stabilizer, pH value, and concentration of sulfide source. The energy position is significantly dependent on the interaction between the pH value and the concentration of the stabilizer, and the effect of high glutathione concentration is opposite at acidic and alkaline conditions thus leading to band gaps of 4.10 eV at pH = 6 and of 3.64 eV at pH = 10. Examples for the synthesis of semiconductor nanoparticles with predefined spectroscopic properties and preset preparation conditions, e.g., alkaline conditions for the implementation of acid-sensitive dopants, are given.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adjustment of the Band Gap Energies of Biostabilized CdS Nanoparticles by Application of Statistical Design of Experiments

et al. 2004

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“…Another possible explanation for the lower quantum yield observed for the shorter surface-bound groups pertains to the accelerated growth of particles capped with these ligands. 57,58 However, from previous TEM studies on these samples the crystallinity of these QDs appears to be comparable to that of the standard TOPO capped QDs. Sensing Properties.…”

Section: Resultsmentioning

confidence: 65%

“…These quenching effect interactions likely play a role in the subsequent PL peak dependence trends noted in Figure , with the longer surface-enhancing ligands leading not only to an enhanced quantum yield but, due to the smaller degree of quenching involved, to slightly blue-shifted peaks with respect to the PL peak observed for the BA and PA-QDs. Another possible explanation for the lower quantum yield observed for the shorter surface-bound groups pertains to the accelerated growth of particles capped with these ligands. , However, from previous TEM studies on these samples the crystallinity of these QDs appears to be comparable to that of the standard TOPO capped QDs.…”

Section: Resultsmentioning

confidence: 93%

Dependence of Hydrocarbon Sensitivity on the Distance of Linked Phenyl Group to CdSe Quantum Dots Surfaces

Amiri¹,

Zhao²,

Dansereau³

et al. 2010

J. Phys. Chem. C

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The hydrocarbon sensing properties of CdSe semiconductor quantum dots (QDs) tailored with benzoic, phenylacetic, 4-phenylbutanoic, or 6-phenylhexanoic acids as a surface enhancement agent have been studied to determine their dependence on the phenyl group distance from the QD surface. QDs of roughly the same size were used to attach each of the mentioned surface agents with similar surface coverages, as determined by nuclear magnetic resonance technique, followed by drop-coating and drying of the QD solutions onto porous anodic aluminum oxide substrates for sensing tests. Results indicated that normalized photoluminescence (PL) enhancement did not vary noticeably for QDs with longer chained phenyl groups compared to those with shorter length groups upon film exposure to xylenes vapors over the range of 15 to 9400 ppm in a balance of air. The quantum yield of CdSe QDs with the 6-phenylhexanoic acid surface ligand has a higher value, 29.4%, compared to those with benzoic acid, 4.5%. Moreover, the PL sensitivity toward xylenes exposure for QDs with 6-phenylhexanoic acid versus those with the surface-bound benzoic acid was about 8 times and 16 times greater at xylenes concentrations below 2500 ppm and above 4500 ppm, respectively. These results suggest that the QDs with longer length surface-enhancing ligands are more promising for this type of hydrocarbon sensing applications.

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Interaction among Cadmium Sulfide Nanoparticles, Acridine Orange, and Deoxyribonucleic Acid in Fluorescence Spectra and a Method for Deoxyribonucleic Acid Determination

et al. 2008

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Some studies on quantum dots (QD) as donors that enhance the fluorescence of a dye as an acceptor through fluorescence resonance energy transfer (FRET) have been reported. However, in the present work we discovered that CdS quantum dots sharply quenched the fluorescence of acridine orange (AO). Also, DNA enhanced the fluorescent signals of AO quenched by CdS. The extents of enhancement were in good proportion to the DNA concentrations. Based on this, a sensitive method was employed to determine DNA with both good selectivity and sensitivity. The calibration curve was linear over 60-4,000 ng mL(-1) and the determination limit (3sigma) was 4.39 ng mL(-1).

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Influence of synthesis parameters on the growth of CdS nanoparticles in colloidal solution and determination of growth kinetics using Karhunen–Loeve decomposition

Cited by 11 publications

References 25 publications

Adjustment of the Band Gap Energies of Biostabilized CdS Nanoparticles by Application of Statistical Design of Experiments

Adjustment of the Band Gap Energies of Biostabilized CdS Nanoparticles by Application of Statistical Design of Experiments

Dependence of Hydrocarbon Sensitivity on the Distance of Linked Phenyl Group to CdSe Quantum Dots Surfaces

Interaction among Cadmium Sulfide Nanoparticles, Acridine Orange, and Deoxyribonucleic Acid in Fluorescence Spectra and a Method for Deoxyribonucleic Acid Determination

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