Abstract Cadmium sulfide/zinc sulfide (CdS/ZnS) core-shell nanoparticles in polyacrylamide (PAM) colloid particle were prepared by the succession of inverse miniemulsion polymerization and absorption. The cadmium sulfate (CdSO4)-PAM colloid was firstly prepared by inverse miniemulsion polymerization, the CdS nanoparticles were formed by reaction between CdSO4 in PAM particles and excessive sodium sulfide in being-absorbed miniemulsion droplets; and then the ZnS nanoparticles were orientated-grew onto CdS nanoparticles by slowly absorbing zinc acetate in miniemulsion droplets. The effects of the Cd2+/Zn2+ molar ratios on CdS/ZnS-PAM particles preparation were investigated. When the Cd2+/Zn2+molar ratio was 1:1, the Z average diameter of the CdS/ZnS-PAM particles was 178 nm. The CdS/ZnS crystals showed a greater size with Zn2+ mole fraction increase. The core-shell structure of CdS/ZnS nanoparticles was confirmed successfully by transmission electron microscopy observation, X-ray diffraction analysis and so on. The ZnS shell layer played an important role in modification and reduced the surface defects of nanocrystals effectively. The succession method will provide a great advantage in core-shell structure CdS/ZnS preparation. Graphical Abstract

中文翻译：

---

CdS/ZnS核壳纳米粒子的制备与表征

摘要 通过反相细乳液聚合和吸附连续制备聚丙烯酰胺（PAM）胶体颗粒中的硫化镉/硫化锌（CdS/ZnS）核壳纳米粒子。硫酸镉(CdSO4)-PAM胶体首先通过反相细乳液聚合制备，通过PAM颗粒中的CdSO4与被吸收的细乳液液滴中过量的硫化钠反应形成CdS纳米颗粒；然后通过在细乳液液滴中缓慢吸收醋酸锌，将 ZnS 纳米颗粒定向生长到 CdS 纳米颗粒上。研究了 Cd2+/Zn2+ 摩尔比对 CdS/ZnS-PAM 颗粒制备的影响。当 Cd2+/Zn2+ 摩尔比为 1:1 时，CdS/ZnS-PAM 颗粒的 Z 平均直径为 178 nm。随着 Zn2+ 摩尔分数的增加，CdS/ZnS 晶体显示出更大的尺寸。通过透射电镜观察、X射线衍射分析等成功证实了CdS/ZnS纳米颗粒的核壳结构。ZnS壳层起到了重要的改性作用，有效地减少了纳米晶的表面缺陷。连续法将在核壳结构的CdS/ZnS制备中提供很大的优势。图形概要