Colloidal Nanospheres of Amorphous Selenium: Facile Synthesis, Size Control, and Optical Properties

Cheng, Haoyan; Zhou, Shan; Xie, Minghao; Gilroy, Kyle D.; Zhu, Zhihong; Xia, Younan

doi:10.1002/cnma.202100115

Cited by 9 publications

(4 citation statements)

References 35 publications

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“…In this work, a -Se nanospheres served as a substrate to control the nucleation and growth of Au. They were synthesized by sequentially adding 100 mg of PVP and 387 mg of H 2 SeO 3 into 100 mL of deionized (DI) water and magnetically stirred at room temperature for 10 min . Then, 1.16 mL of N 2 H 4 ·H 2 O was introduced under magnetic stirring.…”

Section: Methodsmentioning

confidence: 99%

“…Nanospheres made of amorphous Se ( a -Se) have recently received increasing interest as a new platform material for nanomedicine owing to their biological activity and pharmacological actions. − Upon internalization, they can kill cancer cells by generating reactive oxygen species (ROS) and thereby inducing mitochondria-mediated apoptosis in a dosage-dependent manner . Their relatively inert surface, however, calls for modification with a noble metal, followed by conjugation with a bioactive ligand.…”

Section: Introductionmentioning

confidence: 99%

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Controlling the Nucleation and Growth of Au on a-Se Nanospheres to Enhance Their Cellular Uptake and Cytotoxicity

et al. 2023

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We report a method to experimentally control the heterogeneous nucleation and growth of Au nanoparticles on the surface of amorphous Se (a-Se) nanospheres. When a AuIII precursor is added into a colloidal suspension of a-Se nanospheres, galvanic replacement occurs between them and the resultant Au0 atoms then heterogeneously nucleate and grow from the surface of the a-Se nanospheres. As a unique feature of this system, the Au0 atoms can only be produced on the surface of the a-Se nanospheres in the nucleation stage. Once Au nuclei are formed on the surface at the very beginning of a synthesis, they will serve as the preferential sites for further deposition of Au0 atoms, making it possible to control the number of Au nanoparticles on each nanosphere and the morphology of the final product. The dependence of the initial reduction rate on the pH can be used to obtain Se–Au hybrid nanoparticles containing one, two, three, and multiple Au nanoparticles on the surface of each a-Se nanosphere. The presence of Au patches on the hybrid nanoparticles offers an experimental handle to optimize the ligand distribution for the achievement of enhanced cellular uptake and cytotoxicity for the a-Se nanospheres.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Controlling the Nucleation and Growth of Au on a-Se Nanospheres to Enhance Their Cellular Uptake and Cytotoxicity

et al. 2023

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“…The optical properties of selenium sol have been investigated by several groups [21][22][23][24]. As Figure 3 shows, emission spectrum is narrow with high intensity.…”

Section: Studies On Blue Emissionmentioning

confidence: 99%

High-Resolution Color Transparent Display Using Superimposed Quantum Dots

et al. 2022

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In this paper, a high-resolution full-color transparent monitor is designed and fabricated using the synthesized quantum dots for the first time. For this purpose, about 100 compounds that had the potential to emit blue, green, and red lights were selected, and simulation was performed using the discrete dipole approximation (DDA) method, in which the shell layer was selected to be SiO2 or TiO2 in the first step. Among the simulated compounds with SiO2 or TiO2 shells, Se/SiO2 and BTiO3/SiO2 were selected as blue light emitters with high intensity and narrow bandwidth. Accordingly, CdSe/SiO2 nanoparticles were selected as green light emitters and Au/TiO2 for the red light. As the surface of the nanoparticles in their optical properties is important, reactivation of the nanoparticles’ surface is required to reach the high-intensity peak and resolution. To this end, in the second step, the surface of Se and CdSe nanoparticles reacted with ethanolamine, which can make a strong bond with cadmium atoms. The band structure and optical properties were obtained by the density functional theory (DFT) method. The Se/Ethanolamine and CdSe/Ethanolamine were experimentally synthesized to evaluate the theoretical results, and their optical properties were measured. To fabricate a transparent monitor, Se/Ethanolamine, CdSe/SiO2, and Au/TiO2 nanoparticles were dispersed in polyvinyl alcohol (PVA) solved in water and deposited on the glass by the doctor blading technique. Finally, high-resolution videos and images were displayed on the fabricated monitor.

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“…It can be converted into amorphous selenium (a-Se) by melt quenching, vapor deposition, or ball milling. − Similarly to gray Se, a-Se consists of helical chains . Solution-based methods have been developed for the preparation of a-Se, for example, by the reduction of H 2 SeO 3 with hydrazine in aqueous or polyol solutions. , …”

Section: Introductionmentioning

confidence: 99%

Processing Gray Selenium in Phosphonium-Based Ionic Liquids

et al. 2023

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The dissolution of gray selenium in tetraalkylphosphonium acetate ionic liquids was investigated by UV–vis, NMR, and Raman spectroscopy as well as quantum chemical calculations and electrochemical methods. Acetate anions and tetraalkylphosphonium cations facilitate the formation and stabilization of oligoselenides Se n 2– and cationic Se species in the ionic liquid phase. Chemical exchange of selenium atoms was demonstrated by variable-temperature 77Se NMR experiments. Additionally, uncharged cycloselenium molecules exist at high selenium concentrations. Upon dilution with ethanol, amorphous red selenium precipitates from the solution. Moreover, crystalline Se1–x Te x solid solutions precipitate when elemental tellurium is added to the mixture as confirmed by powder X-ray diffraction and Raman spectroscopy.

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Colloidal Nanospheres of Amorphous Selenium: Facile Synthesis, Size Control, and Optical Properties

Cited by 9 publications

References 35 publications

Controlling the Nucleation and Growth of Au on a-Se Nanospheres to Enhance Their Cellular Uptake and Cytotoxicity

Controlling the Nucleation and Growth of Au on a-Se Nanospheres to Enhance Their Cellular Uptake and Cytotoxicity

High-Resolution Color Transparent Display Using Superimposed Quantum Dots

Processing Gray Selenium in Phosphonium-Based Ionic Liquids

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