ZnSe CdSe Core Shell Nanoparticles (Zinc Selenium/Cadmium Selenium, 99.9%, APS: 80-100nm, Inorganic Semiconductor)

ZnSe CdSe Core-Shell Nanoparticles

Applications:

ZnSe/CdSe Core-Shell Nanoparticles are a specific class of core-shell nanomaterials where zinc selenide (ZnSe) forms the core and cadmium selenide (CdSe) constitutes the shell. These nanoparticles combine the beneficial properties of both ZnSe and CdSe, two important semiconductors in the realm of optical materials, quantum dots, and photonic devices.

Structure and Composition

Core: Zinc Selenide (ZnSe)

Zinc selenide (ZnSe) is a wide-bandgap semiconductor with a bandgap of approximately 2.7 eV. It has excellent optical properties, including good transparency in the visible and near-infrared regions, and is often used in optical devices and photonics.

ZnSe is a nontoxic material and has promising applications in photonic devices, infrared optics, and optical communications. Due to its relatively low toxicity and biocompatibility, ZnSe-based nanoparticles are also studied for biological applications such as bioimaging and drug delivery.

Properties

The ZnSe/CdSe core-shell nanoparticles have several unique properties that make them highly attractive for a variety of applications:

Enhanced Optical Properties:

The ZnSe core provides a stable and wide-bandgap material, while the CdSe shell contributes to bright fluorescence and tunable emission. The shell’s thickness and composition can be precisely controlled to adjust the emission wavelength, providing multicolor fluorescence with narrow and tunable emission peaks.

The core-shell structure leads to higher quantum yields and improved photostability by reducing surface defects, which are typically responsible for fluorescence quenching.

Improved Stability:

The CdSe shell acts as a protective barrier that improves the chemical stability of the ZnSe core, preventing oxidation and surface degradation, which are common issues in pure ZnSe nanoparticles. This enhancement of photostability makes ZnSe/CdSe core-shell nanoparticles ideal for long-term applications in harsh environments, such as biological imaging and environmental sensing.

Surface Passivation:

The CdSe shell helps to passivate the surface of the ZnSe core, which reduces the number of surface defects that could trap charge carriers and lead to fluorescence quenching. This results in better luminescent efficiency and longer-lasting fluorescence, which is particularly beneficial for imaging and biosensing applications.