Abstract
Quantum dots have diverse chemical properties with different ligands attached on the surface. The cysteamine has been used as a ligand for various quantum dots because it has high solubility in water, and it facilitates binding of quantum dot and gold surface. However, the hydrogen bonds in cysteamine cause aggregation of the cysteamine capped quantum dots. In this study, we suggested a simple synthesis method of aggregation-free PbS quantum dot and analyzed the electric and optical properties of the synthesized quantum dot. This study on aggregation-free cysteamine capped quantum dots has the potential to develop advanced quantum dot-based sensor technologies, including biomedical imaging and environmental sensors.
Highlights
Over the past decade, quantum dots have attracted great attention in various research fields and industries because of their distinct electrical and optical properties from bulk materials.Three-dimensional quantum confinements are caused by particle size below Bohr’s exciton radius effects on the energy band structure, which is deeply related to the electrical and optical properties of quantum dots [1,2]
We describe a simple synthesis method of aggregation-free cysteamine capped
Cysteamine capped PbS quantum dot was synthesized in aqueous solution with sodium docusate as a stabilizing agent
Summary
Quantum dots have attracted great attention in various research fields and industries because of their distinct electrical and optical properties from bulk materials.Three-dimensional quantum confinements are caused by particle size below Bohr’s exciton radius effects on the energy band structure, which is deeply related to the electrical and optical properties of quantum dots [1,2]. Unlike in the bulk semiconductors, the dimension-dependent density of states has the shape of delta function in the quantum dots. This yields the absorption and emission spectra of quantum dots, with narrow full width half maximum (FWHM) centered at particular wavelength. The quantum dots have engineering advantages where the absorption and emission spectra can be adjusted by changing the synthesis conditions. These properties of quantum dots provide high wavelength-selectivity, accuracy, and sensitivity [3,4,5,6]. Quantum dots are considered one of the most promising materials in various applications, including optoelectronics [7,8], biosensors [9,10,11,12,13,14], energy harvesters [15,16,17], and quantum dot-based lasers [18,19]
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