Nanosized silver sulfide particles: characterization, self-organization into 2D and 3D superlattices

Piléni, M. P.; Motte, Laurence; Billoudet, F.; Mahrt, J.; Willig, F.

doi:10.1016/s0167-577x(96)00281-9

Cited by 29 publications

(23 citation statements)

References 24 publications

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“…[15][16][17] While a simple AgNO 3 salt is typically used as the silver source, various organic and inorganic sulfides are used to provide S 2ions, including (NH 4 ) 2 S, H 2 S, and alkyl thiols. 15,[18][19][20][21][22][23][24] Surfactants, on the other hand, are used to form micelles or microemulsions in chemical synthesis with the purpose of controlling particle size and shape. [25][26][27] In this work we report on the nucleation and growth of Ag 2 S nanoparticles (NP) in a stopped flow reaction mixer.…”

Section: Introductionmentioning

confidence: 99%

Nucleation and Growth of Silver Sulfide Nanoparticles

2010

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Real time UV-visible absorption measurements of stopped flows of AgNO 3 and (NH 4 ) 2 S are used to study the nucleation and growth of silver sulfide nanoparticles (Ag 2 S NP). Ag 2 S NP in the size range of 2 to 10 nm are formed a few seconds after the flow containing the reactants stops. The absorbance near the band edge of the semiconductor nanoparticle is used to monitor the number of particles formed with time and study the nucleation process. Transmission electron microscopy measurements are used to correlate particle size and the indirect band gap energy, determined from the onset of light absorption. A linear relation is established between Ag 2 S NP particle size and indirect band gap energy. The nucleation and growth process are not well separated in time. The initial nucleation and growth rates are found to increase with initial [AgNO 3 ] o /[(NH 4 ) 2 S] o ratios larger than 1. Silver-rich sulfides are proposed to be involved in the nucleation stage and growth process of Ag 2 S NP. Density functional calculations are consistent with that interpretation: Ag 3 S + is found to have a lower energy than the Ag 2 S and AgSH molecules or the AgSand Ag 2 SH + ions. The results are discussed in terms of classic nucleation theory and the possible growth mechanisms are discussed.

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Section: Introductionmentioning

confidence: 99%

Nucleation and Growth of Silver Sulfide Nanoparticles

2010

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“…15 Furthermore, preparation of Ag 2 S is complicated by the strong tendency of Ag 2 S clusters to aggregate to form bulk precipitates. 16 Reverse micelle techniques have been employed, 17 along with silver thiolate polymers 18 and thermal decomposition under argon of a silver(I) dialkyldithiophosphate. 9 Here we report a green and general route applied to the preparation of photonic chalcogenides with CuS (covellite), Cu $1.9 S, Ag 2 S (acanthite) and CdS (hawleyite) nanoparticles as examples.…”

Section: Introductionmentioning

confidence: 99%

Metal sulfidenanoparticles synthesized via enzyme treatment of biopolymer stabilized nanosuspensions

Kim

Walsh²

2010

Nanoscale

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Nanoparticles of CuS, Cu(x)S, Ag(2)S and CdS were successfully prepared using a novel general and green synthetic process to give dextran biopolymer stabilised metal sulfifde nanosuspensions. Following preparation, dextranase enzyme was used to remove the bulk of the bound dextran to give pure stable metal sulfide nanocrystals for application in for example aspects of medicine, photonics and solar cells. Particles of good homogeneity were obtained and the CuS nanoparticle size was controlled to 9-27 nm by adjusting the reaction conditions. Cu(2)S nanoparticles were 14 nm, Ag(2)S nanoparticles were 20-50 nm and CdS nanoparticles were 9 nm is size. The complexing mechanism of nanoparticle sulfides to dextrans was further studied using carboxylmethyl dextran as a complexing agent and crosslinked Sephadex (dextran) ;beads as substrate. Particles were characterized by TEM, XRD, TGA, FT-IR and zeta-potential measurement, and their UV-vis spectroscopic absorption properties were determined. Stabilization of the sulfide nanoparticles with soluble hydroxylated biopolymers such as dextran is previously unreported and is here interpreted in terms of viscosity, pH of the system and weak polar S-H or S(metal)OH(2)(+) interactions with dextran depending on the material. Notably, the complexing mechanism appears to differ significantly from that taking place in known dextran-metal oxide systems. The process shown here has good potential for scale-up as a biosynthetic route for a range of functional sulfide nanoparticles.

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“…In this paper, we report a simple, efficient, and reproducible route to the synthesis of colloidal Ag 2 S capped with glutathione and cysteine. Furthermore, the use of bifunctional capping agents such as mercapto- carboxylic acids or thiolate-amino acids confer additional advantages in that the surface states of these molecules may be controlled with solution pH, thus providing a convenient mechanism for manipulating surface states of bifunctionally capped nanoparticles. , Ag 2 S nanoparticles capped with biomolecules also provide the opportunity to study interaction between nanoparticles and biomolecules and are promising for applications including biological fluorescence imaging, as shown with CdS nanoparticles. , Ag 2 S nanoparticles coated with dodecanethiol have been found to form self-assembled large domain hexagonal 2-dimensional layers and highly ordered face-centered cubic 3-dimensional structures. ,, Silver sulfide thin films with stoichiometric compositions containing excess silver have shown great promise for photoimaging and photodetection in the IR region…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Ultrafast Study of Cysteine- and Glutathione-Capped Ag₂S Semiconductor Colloidal Nanoparticles

et al. 1999

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A new synthetic method has been developed for preparing silver sulfide, Ag 2 S, nanoparticles capped with cysteine or glutathione. The average particle diameter has been determined to be around 9 nm using transmission electron microscopy. The ground-state electronic absorption spectra of the Ag 2 S nanoparticles show a continuous increase in absorption cross section toward shorter wavelengths starting from the red (600-800 nm). Ultrafast dynamics of photoinduced electrons in these nanoparticles have been measured using femtosecond transient absorption/bleach spectroscopy. In most cases studied, the early time transient profiles feature a pulse-width limited (<150 fs) rise followed by a fast decay (750 fs) and a slower rise (4.5 ps). The signal has contribution from both transient absorption and transient bleach. On longer time scales, three (Cys-1, Cys-2, and GSH-2) of the four samples studied show a recovery with 4.5 ps time constant that goes above the baseline and then decays gradually toward the baseline with a time constant of >1 ns. One sample (GSH-1) shows a bleach recovery that gradually approaches the baseline with a similar time constant (>1 ns) following the fast 4.5 ps rise. An interesting power dependence was observed for all the samples: the transient absorption contribution becomes more dominant over bleach with increasing excitation intensity. A simple four-state kinetic model developed to account for the main features of the dynamics suggests that initial photoexcitation populates the conduction band and depletes the valence band within the laser pulse (<150 fs). The conduction band electrons are first trapped in shallow trap states with a time constant of 500 fs and then further trapped into deep traps with a constant of 4 ps. The deep trapped electrons finally recombine with the hole with a time constant of >1 ns. This model suggests that the difference in dynamics observed between the different samples is due to different absorption cross sections of deep trap states. The observed excitation intensity dependence of the dynamics is attributed to shallow trap state saturation at high intensities.

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Nanosized silver sulfide particles: characterization, self-organization into 2D and 3D superlattices

Cited by 29 publications

References 24 publications

Nucleation and Growth of Silver Sulfide Nanoparticles

Nucleation and Growth of Silver Sulfide Nanoparticles

Metal sulfidenanoparticles synthesized via enzyme treatment of biopolymer stabilized nanosuspensions

Synthesis and Ultrafast Study of Cysteine- and Glutathione-Capped Ag₂S Semiconductor Colloidal Nanoparticles

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Nanosized silver sulfide particles: characterization, self-organization into 2D and 3D superlattices

Cited by 29 publications

References 24 publications

Nucleation and Growth of Silver Sulfide Nanoparticles

Nucleation and Growth of Silver Sulfide Nanoparticles

Metal sulfidenanoparticles synthesized via enzyme treatment of biopolymer stabilized nanosuspensions

Synthesis and Ultrafast Study of Cysteine- and Glutathione-Capped Ag2S Semiconductor Colloidal Nanoparticles

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Synthesis and Ultrafast Study of Cysteine- and Glutathione-Capped Ag₂S Semiconductor Colloidal Nanoparticles