Applicability of Quantum Dots in Biomedical Science

Semiconducting Quantum Dots: From Preparation to the Modification and Applications in Biomedical Science

SSRN Electronic Journal ◽

10.2139/ssrn.3478067 ◽

2019 ◽

Author(s):

Lude Wang ◽

Xiang Chen ◽

Shaodong Zhang ◽

Taojian Fan ◽

Nasir Mahmood Abbasi ◽

...

Keyword(s):

Quantum Dots ◽

Biomedical Science

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One-Step Hydrothermal Synthesis of Yellow and Green Emitting Silicon Quantum Dots with Synergistic Effect

Nanomaterials ◽

10.3390/nano9030466 ◽

2019 ◽

Vol 9 (3) ◽

pp. 466

Author(s):

Zhixia Zhang ◽

Chunjin Wei ◽

Wenting Ma ◽

Jun Li ◽

Xincai Xiao ◽

...

Keyword(s):

Quantum Dots ◽

Synergistic Effect ◽

High Efficiency ◽

Synergistic Effects ◽

Biomedical Science ◽

Future Application ◽

Quantum Yields ◽

Silicon Quantum Dots ◽

Long Wavelength ◽

One Step

The concept of synergistic effects has been widely applied in many scientific fields such as in biomedical science and material chemistry, and has further attracted interest in the fields of both synthesis and application of nanomaterials. In this paper, we report the synthesis of long-wavelength emitting silicon quantum dots based on a one-step hydrothermal route with catechol (CC) and sodium citrate (Na-citrate) as a reducing agent pair, and N-[3-(trimethoxysilyl)propyl]ethylenediamine (DAMO) as silicon source. By controlling the reaction time, yellow-emitting silicon quantum dots and green-emitting silicon quantum dots were synthesized with quantum yields (QYs) of 29.4% and 38.3% respectively. The as-prepared silicon quantum dots were characterized by fluorescence (PL) spectrum, UV–visible spectrum, high resolution transmission electron microscope (HRTEM), Fourier transform infrared (FT-IR) spectrometry energy dispersive spectroscopy (EDS), and Zeta potential. With the aid of these methods, this paper further discussed how the optical performance and surface characteristics of the prepared quantum dots (QDs) influence the fluorescence mechanism. Meanwhile, the cell toxicity of the silicon quantum dots was tested by the 3-(4,5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium (MTT) bromide method, and its potential as a fluorescence ink explored. The silicon quantum dots exhibit a red-shift phenomenon in their fluorescence peak due to the participation of the carbonyl group during the synthesis. The high-efficiency and stable photoluminescence of the long-wavelength emitting silicon quantum dots prepared through a synergistic effect is of great value in their future application as novel optical materials in bioimaging, LED, and materials detection.

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Semiconducting quantum dots: Modification and applications in biomedical science

Science China Materials ◽

10.1007/s40843-020-1330-7 ◽

2020 ◽

Vol 63 (9) ◽

pp. 1631-1650 ◽

Cited By ~ 1

Author(s):

Lude Wang ◽

Duo Xu ◽

Jie Gao ◽

Xiang Chen ◽

Yanhong Duo ◽

...

Keyword(s):

Quantum Dots ◽

Biomedical Science

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Nanopyramid With High Purity And Their Local Plasmonic Properties

10.22541/au.161616403.37101015/v1 ◽

2021 ◽

Author(s):

Man Qiu ◽

Li Yu

Keyword(s):

Quantum Dots ◽

Optical Properties ◽

Quantum Information ◽

Electric Field ◽

High Purity ◽

Room Temperature ◽

Near Infrared ◽

Biomedical Science ◽

Novel Applications ◽

Mode Volume

Au nanopyramid particles (Au NBPs) are highly desirable for its remarkable optical properties such as long-range tunable resonance. It has wide applications in room-temperature bioimaging probes and bioanalytical sensors. In this paper, we synthesize Au NBPs with a purity of 95%, and obtain the optical response of Au NBP in near infrared regime. We find that Au NBPs have small mode volume of electric field which can lead to the strong coupling with quantum dots at room temperature. It provides novel applications for Au NBPs in fields of materials, biomedical science, and quantum information

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Nanostructure of semiconductor quantum dots in a borosilicate glass matrix by complementary use of HREM and AEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100176770 ◽

1990 ◽

Vol 48 (4) ◽

pp. 728-729

Author(s):

M.J. Kim ◽

L.C. Liu ◽

S.H. Risbud ◽

R.W. Carpenter

Keyword(s):

Quantum Dots ◽

Borosilicate Glass ◽

Glass Matrix ◽

Optical Switching ◽

Response Times ◽

Fast Response ◽

Processing Technique ◽

Internal Stresses ◽

Electron Hole ◽

Spatial Dimensions

When the size of a semiconductor is reduced by an appropriate materials processing technique to a dimension less than about twice the radius of an exciton in the bulk crystal, the band like structure of the semiconductor gives way to discrete molecular orbital electronic states. Clusters of semiconductors in a size regime lower than 2R {where R is the exciton Bohr radius; e.g. 3 nm for CdS and 7.3 nm for CdTe) are called Quantum Dots (QD) because they confine optically excited electron- hole pairs (excitons) in all three spatial dimensions. Structures based on QD are of great interest because of fast response times and non-linearity in optical switching applications.In this paper we report the first HREM analysis of the size and structure of CdTe and CdS QD formed by precipitation from a modified borosilicate glass matrix. The glass melts were quenched by pouring on brass plates, and then annealed to relieve internal stresses. QD precipitate particles were formed during subsequent "striking" heat treatments above the glass crystallization temperature, which was determined by differential thermal analysis.

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