Aqueous based ultra-small magnetic Cr-doped CdSe quantum dots as a potential dual imaging probe in biomedicine

• Published in: BIOMATERIALS SCIENCE Vol. 12; no. 24; pp. 6338 - 635
• Main Authors: Bandaru, Shamili, George, Nilja, Sharma, Bhargy, Palanivel, Mathangi, Mukherjee, Arunima, Wu, Wen-Ya, Ghosh, Krishna Kanta, Ball, Writoban Basu, Gulyas, Balazs, Padmanabhan, Parasuraman, Ghosh, Siddhartha, Chakrabortty, Sabyasachi
• Format: Journal Article Publication
• Language: English
• Published: England Royal Society of Chemistry 03.12.2024
• Subjects: Cadmium Compounds - chemistry; Cadmium selenides; Chromium; Chromium - chemistry; Doping; Electrons; Fluorescence; Harnesses; Humans; Magnetic materials; Magnetic properties; Magnetic Resonance Imaging; Magnetic semiconductors; Magnetics; Medical imaging; Optical properties; Photoelectrons; Photoluminescence; Quantum dots; Quantum Dots - chemistry; Selenium Compounds - chemistry; Semiconductors; Spectrum analysis; Spintronics; Transition metals; Water - chemistry; X ray photoelectron spectroscopy; X-Ray Diffraction
• DOI: 10.1039/d4bm00811a
• ISSN: 2047-4830; 2047-4849

The substitution of semiconductor quantum dots (QDs) by a small number of transition-metal ions with magnetic properties gives rise to magnetic-doped semiconductors. With a balance of optical and magnetic properties, these magnetic semiconductors are widely used in spintronics, bioimaging and magnetic resonance imaging (MRI) applications. To facilitate their usage in bio-applications, it is critical to synthesize water-soluble magnetic QDs with a stabilized structure while maintaining their optical and magnetic properties. Here in our work, we have developed a facile substituted synthetic route to achieve Cr-doped CdSe (Cr-CdSe) via hydrothermal method. The effects of doping on the structural, optical, and magnetic properties of Cr-CdSe were studied using X-ray diffraction, UV-visible spectroscopy, and photoluminescence lifetime. We then explored their chemical nature and change in morphology with an increase in doping concentration via X-ray photoelectron spectroscopy and transmission electron microscopy. Water-soluble QDs have been used as bioimaging probes for the past few decades due to their strong fluorescence, photostability and improved tissue or cellular penetration. However, incorporating magnetic material into a fluorescent entity harnesses the ability to control the strengths of both modalities, which enhances diagnostic accuracy and facilitates its application in bio-systems, especially in early accurate diagnosis. Finally, we demonstrate the competency of Cr-CdSe as a dual-imaging probe with fluorescent cellular imaging and MRI applications. Water-soluble Cr-doped CdSe was synthesized by a one-pot hydrothermal method with controlled optical and magnetic properties in a nanoscale regime as a dual-imaging probe, namely fluorescent imaging, and magnetic resonance imaging (MRI).