A facile and green preparation of high-quality CdTe semiconductor nanocrystals at room temperature

Abstract

One chemical reagent, hydrazine hydrate, was discovered to accelerate the growth of semiconductor nanocrystals (cadmium telluride) instead of additional energy, which was applied to the synthesis of high-quality CdTe nanocrystals at room temperature and ambient conditions within several hours. Under this mild condition the mercapto stabilizers were not destroyed, and they guaranteed CdTe nanocrystal particle sizes with narrow and uniform distribution over the largest possible range. The CdTe nanocrystals (photoluminescence emission range of 530-660 nm) synthesized in this way had very good spectral properties; for instance, they showed high photoluminescence quantum yield of up to 60%. Furthermore, we have succeeded in detecting the living Borrelia burgdorferi of Lyme disease by its photoluminescence image using CdTe nanocrystals.

Nucleation of Aqueous Semiconductor Nanocrystals: A Neglected Factor for Determining the Photoluminescence

“…44 Besides, many techniques are applied to promote the growth of aqueous NCs, such as hydrothermal synthesis, ultrasonic irradiation, microwaveassistant synthesis, and so forth. [47][48][49][50][51][52][53][54][55][56][57] However, the quality of the as-prepared NCs is usually worse than those synthesized through the organometallic method (or the derivative methods), because of the complex ionic environment and the low boiling point of water. 58,59 Moreover, versatile strategies are applied to optimize the quality of as-prepared NCs through postpreparative treatments, including size-selective precipitation, selective photochemical etching, and surface modification.…”

A General Solvothermal Route to the Synthesis of CoTe, Ag2Te/Ag, and CdTe Nanostructures with Varied Morphologies

“…[12] As an important wide band gap II-VI semiconductor, CdTe continues to draw increasing attention in both fundamental studies and for its various promising ap- [ plications in the field of photonic crystals, light-emitting diodes (LEDs), solar cells, and bioimaging. [13][14][15][16][17][18] The CdTe nanostructured materials exhibit outstanding optical and electrical properties, [19][20][21][22][23][24][25][26][27] and reducing the dimensionality and size of CdTe to a nanoscale range may be a successful strategy to gain further enhancements in both optical and electrical properties.…”

Preparation of Fluorescent Thiol Group‐Functionalized Silica Microspheres for the Detection and Removal of Silver Ions in Aqueous Solutions

“…CdTe QDs were prepared by using a previously published method . First, the NaHTe solution was prepared by reacting tellurium powder with NaBH 4 at the molar ratio of 1:2.…”

“…CdTe QDs were prepared by using a previously published method. 27 First, the NaHTe solution was prepared by reacting tellurium powder with NaBH 4 at the molar ratio of 1:2. And then the NaHTe solution was mixed with an oxygen-free CdCl 2 solution (1.25 mmol/ L) in the presence of MPA, when the pH of solution was 11.2.…”