ChemInform Abstract: Optical Properties of CdS and PbS Clusters Encapsulated in Zeolites.

Wang, Y.; Herron, Norman

doi:10.1002/chin.198715015

Cited by 8 publications

(11 citation statements)

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“…Consequently, much effort has been devoted to the synthesis of these small quantum-sized particles. CdS NPs have been successfully synthesized in a variety of media, such as nonaqueous solvents [11][12][13], reverse micelles [14,15], vesicles [16], zeolites [17,18], and others [19,20]. Some of the synthetic methods use Cd 2+ and H 2 S in separate phases that are unevenly mixed and result in the uneven formation and aggregation of CdS NPs.…”

Section: Introductionmentioning

confidence: 99%

CdS Nanoparticles with a Thermoresponsive Polymer: Synthesis and Properties

Khan

2012

Journal of Nanomaterials

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This paper describes the synthesis of thermoresponsive colloidal nanocomposites based on CdS and poly(N-isopropylacrylamide). The CdS nanoparticles were prepared at room temperature from cadmium chloride and sodium sulfide salts in the presence of an organic ligand, 3-mercaptopropionic acid (MPA). The as-prepared MPA-bound CdS nanoparticles were stable for more than 30 days and exhibited good optical properties. The effect of various ratios of MPA/Cd2+and H2O/DMF (dimethylformamide) on the particle size of the CdS nanoparticles was investigated using UV-vis absorption measurements. Transmission electron microscopy studies showed that the particle sizes were approximately 4 nm in diameter, which is consistent with the size obtained using UV-vis spectroscopy. The CdS nanocomposite showed a temperature-responsive phenomenon as its temperature increased from 20 to 45°C.

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Section: Introductionmentioning

confidence: 99%

CdS Nanoparticles with a Thermoresponsive Polymer: Synthesis and Properties

Khan

2012

Journal of Nanomaterials

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“…19( 9) 43( 6) 43( 6) 96 O4 96(g) 8124( 8) 8124( 8) 31840 (11) 184 (7) 184 (7) 243( 12 6128 (22) 6128 (22) 363 (20) 363 (20) 363( 20 angles are 89.43 (12) and 90.57(12)°(Table 4), nearly perfectly octahedral.…”

Section: Description Of the Structuresmentioning

confidence: 97%

“…7−9 They suggested that the cluster size was less than 13 Å at a low-loading level, and that a three-dimensional superlattice might form at higher loading. 7 From other experiments, they reported that discrete Cd 4 (S or O) 4 cubes formed in zeolite Y at low loading, and that these cubes begin to interconnect to form an imperfect supercluster structure at higher loadings. 8 Their EXAFS analysis showed that the discrete cubes consisted of interpenetrating tetrahedra of Cd and S atoms with a Cd−S bond length of 2.47 Å in the sodalite cavities of zeolite Y, and that pairs of Cd atoms occupied double 6-rings with a Cd−Cd distance of ca.…”

Section: Introductionmentioning

confidence: 96%

Structures of the Subnanometer Clusters of Cadmium Sulfide Encapsulated in Zeolite Y: Cd₄S⁶⁺ and Cd(SHCd)₄⁶⁺

2016

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The structures of the subnanometer clusters of CdS that form in zeolite Y (FAU), prepared as follows, have been determined. A single crystal of Cd 2+ -exchanged zeolite Y was prepared by the exchange of Na 75 −Y (|Na 75 |[Si 117 Al 75 O 384]−Y with aqueous Cd(NO 3 ) 2 at 294 K, followed by vacuum dehydration at 723 K (crystal 1). A second crystal, similarly prepared, was exposed to 6.7 × 10 4 Pa of dry H 2 S(g) for 6 h at 294 K and evacuated (crystal 2). Their structures were determined crystallographically using synchrotron X-rays and were refined using all data to the final error indices (calculated using only0.040/0.156 and 0.049/0.186, respectively. In crystal 1, Cd 2+ ions primarily occupy sites I and II. In crystal 2, |Cd 27 (Cd 4 S 6+ ) 0.6 (Cd-(SHCd) 4 6+ ) 0.9 H 12 |[Si 117 Al 75 O 384 ]−FAU, tetrahedral Cd 4 S 6+ ions center about 7.5% of the sodalite cavities and tetrahedral Cd(SHCd) 4 6+ ions center about 11% of the supercages. In Cd(SHCd) 4 6+, a Cd 2+ ion at the center of a supercage bonds tetrahedrally to four SH − ions, each of which bonds in turn to an 8-ring Cd 2+ ion. Of the 36.5(9) Cd 2+ ions per unit cell (indicating complete or nearly complete Cd 2+ exchange) before treatment with H 2 S(g), only 6.9 participate in the above clusters. Most, 27, remain uncomplexed, and 2.6 have left the zeolite as CdS(s). No neutral clusters of formula Cd n S n are present within the zeolite.

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“…Semiconductors may be included in a variety of media including polymers [ 7 - 9 ], micelles [ 10 , 11 ], glassy particles [ 12 ], and zeolites [ 13 ]. The synthesis of semiconducting nanoparticles in glass matrices has become very important.…”

Section: Introductionmentioning

confidence: 99%

Direct-writing of PbS nanoparticles inside transparent porous silica monoliths using pulsed femtosecond laser irradiation

et al. 2011

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Pulsed femtosecond laser irradiation at low repetition rate, without any annealing, has been used to localize the growth of PbS nanoparticles, for the first time, inside a transparent porous silica matrix prepared by a sol-gel route. Before the irradiation, the porous silica host has been soaked within a solution containing PbS precursors. The effect of the incident laser power on the particle size was studied. X-ray diffraction was used to identify the PbS crystallites inside the irradiated areas and to estimate the average particle size. The localized laser irradiation led to PbS crystallite size ranging between 4 and 8 nm, depending on the incident femtosecond laser power. The optical properties of the obtained PbS-silica nanocomposites have been investigated using absorption and photoluminescence spectroscopies. Finally, the stability of PbS nanoparticles embedded inside the host matrices has been followed as a function of time, and it has been shown that this stability depends on the nanoparticle mean size.

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ChemInform Abstract: Optical Properties of CdS and PbS Clusters Encapsulated in Zeolites.

Abstract: It is demonstrated that CdS and PbS clusters encapsulated in zeolites show dramatic deviations from bulk optical properties.

Cited by 8 publications

References 1 publication

CdS Nanoparticles with a Thermoresponsive Polymer: Synthesis and Properties

CdS Nanoparticles with a Thermoresponsive Polymer: Synthesis and Properties

Structures of the Subnanometer Clusters of Cadmium Sulfide Encapsulated in Zeolite Y: Cd₄S⁶⁺ and Cd(SHCd)₄⁶⁺

Direct-writing of PbS nanoparticles inside transparent porous silica monoliths using pulsed femtosecond laser irradiation

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ChemInform Abstract: Optical Properties of CdS and PbS Clusters Encapsulated in Zeolites.

Abstract: It is demonstrated that CdS and PbS clusters encapsulated in zeolites show dramatic deviations from bulk optical properties.

Cited by 8 publications

References 1 publication

CdS Nanoparticles with a Thermoresponsive Polymer: Synthesis and Properties

CdS Nanoparticles with a Thermoresponsive Polymer: Synthesis and Properties

Structures of the Subnanometer Clusters of Cadmium Sulfide Encapsulated in Zeolite Y: Cd4S6+ and Cd(SHCd)46+

Direct-writing of PbS nanoparticles inside transparent porous silica monoliths using pulsed femtosecond laser irradiation

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Structures of the Subnanometer Clusters of Cadmium Sulfide Encapsulated in Zeolite Y: Cd₄S⁶⁺ and Cd(SHCd)₄⁶⁺