Facile Size‐controllable Aqueous Synthesis of Water Soluble CdTe/Cd(OH) 2 Core/Shell Nanoparticles with Tunable Optical Property, High Quantum Yield and Good Stability

A facile procedure was developed to prepare size‐tunable and water soluble CdTe/Cd(OH) 2 core/shell nanoparticles with high quantum yields and good stability using inexpensive inorganic precursors (CdCl 2 and elemental Te). The emission colors of the prepared CdTe/Cd(OH) 2 core/shell nanoparticles can be readily tuned from cyan to salmon pink by varying incubation time to control the growth of the Cd(OH) 2 shell onto the CdTe nanoparticles. The CdTe/Cd(OH) 2 core/shell nanoparticles were characterized by transmission electron microscopy, high‐resolution transmission electron microscopy, X‐ray powder diffraction spectrometry, photoluminescence and UV‐Vis spectrometry. The good water‐soluble nature of the CdTe/Cd(OH) 2 core/shell nanoparticles offers great potentiality for their bio‐labeling application. This approach is simple, mild and readily scaled up, affording a simple way for synthesis of size‐tunable inorganic metal hydroxide capped core/shell nanoparticles.