Synthesis and optical properties of composites based on ternary Zn1–xCdxS nanoparticles enclosed in a layered octosilicate. (December 2014)

• Record Type: Journal Article
• Authors: Chen, Y.; Yu, Z.; Yu, G.; Yan, Y.
• Is Part Of: Clay minerals. Volume 49:Number 5(2014:Dec.)
• Page Start: 703
• Page End: 716
• Publication Date: 2014-12
• Subjects: Zn1–xCdxS, -- Na-octosilicates, -- optical properties, -- composites; Clay minerals -- Periodicals; Clay -- Periodicals; 549.6
• DOI: 10.1180/claymin.2014.049.5.07
• Languages: English
• ISSNs: 0009-8558

Abstract

Abstract: In order to improve the optical properties and enhance the stability of Zn1– x Cd x S nanoparticles, which are important optoelectrical materials, the ternary Zn1– x Cdx S nanoparticles were enclosed in a layered octosilicate by a three-step process, namely (i) protonation of Naoctosilicate, (ii) ion-exchange in order to introduce Zn and Cd ions into the interlayer space, and (iii) addition of S 2– to form Zn1– x Cd x S particles in the interlayer space of the octosilicate. The basal spacing (~10 Å) of the final ZnCdS-Oct-n (n = 1, 2, 3, 4) composites noticeably increased in comparison with that of the precursor H-Oct (7.5 Å). This may be attributed to the incorporation of larger size Zn1– x Cd x S particles into the interlayer space of H-Oct. The UV-visible spectra of the composites suggested that the transmission band-edges gradually shifted to low energy with increasing molar ratio of Cd/Zn. Moreover, the transmission band-edges of the composites are between those of layered Octosilicate, ZnS, and CdS. TEM observation confirmed that the size of Zn1– x Cd x S nanoparticles enclosed in the layered silicate was about ~3–5 nm.