Cadmium deoxycholate: a new and efficient precursor for highly luminescent CdSe nanocrystals

Chakrabarty, Arkajyoti; Chatterjee, Sayantan; Maitra, Uday

doi:10.1039/c3tc00817g

Cited by 21 publications

(16 citation statements)

References 37 publications

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“…15 The bile acid based Cd-precursor has the advantage over other commonly used Cd-precursors (e.g. The reactions were carried out at high pressure (10 MPa) and temperatures (250 1C o T o 310 1C) inside standard stainless-steel capillaries in supercritical hexane, making the system both readily fabricated and scalable.…”

Section: Introductionmentioning

confidence: 99%

Continuous synthesis of high quality CdSe quantum dots in supercritical fluids

et al. 2015

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We demonstrate in here a powerful scalable technology to synthesize continuously high quality CdSe quantum dots (QDs) in supercritical hexane. Using a low cost, highly thermally stable Cd-precursor, cadmium deoxycholate, the continuous synthesis is performed in 400 mm ID stainless steel capillaries resulting in CdSe QDs having sharp full-width-at-half-maxima (23 nm) and high photoluminescence quantum yields (45-55%). Transmission electron microscopy images show narrow particles sizes distribution (s r 5%) with well-defined crystal lattices. Using two different synthesis temperatures (250 1C and 310 1C), it was possible to obtain zinc blende and würtzite crystal structures of CdSe QDs, respectively. This synthetic approach allows achieving substantial production rates up to 200 mg of QDs per hour depending on the targeted size, and could be easily scaled to gram per hour.India † Electronic supplementary information (ESI) available: Calculation of quantum yields of CdSe QDs at different excitation wavelengths based on the excitation, absorption spectra and experimental quantum yields, example of calculation of production rate. See

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Section: Introductionmentioning

confidence: 99%

Continuous synthesis of high quality CdSe quantum dots in supercritical fluids

et al. 2015

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“…The core‐shell CdSe‐CdS QRs (S‐in‐R or R‐in‐R) were synthesized in two steps (Figure a). At first, 3 nm wurtzite spherical CdSe cores or 12 nm long CdSe rods were prepared using the highly thermally stable steroidal precursor cadmium deoxycholate (Cd(DCh) 2 ) instead of the most common CdO or cadmium carboxylate salts . The use of this Cd‐salt of deoxycholic acid as the precursor for the QR synthesis allows to explore a larger temperature range for the synthesis of nanocrystals and is additionally composed of an innocuous chemically inert steroidal component.…”

Section: Resultsmentioning

confidence: 99%

“…Cadmium deoxycholate (Cd(DCh) 2 ) precursor was prepared at a large scale using a previously reported procedure . Thus, Cd(NO 3 ) 2 , 4H 2 O and sodium deoxycholate were mixed together in methanol at room temperature to obtain a white gelatinous precipitate, which was isolated by filtration and dried subsequently.…”

Section: Methodsmentioning

confidence: 99%

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Wire‐Like Tip‐To‐Tip Linked Assemblies of CdSe‐CdS Quantum Rods Promoted on Supramolecular Nanofibers of Hybrid Organo‐ and Hydrogels

et al. 2019

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A variety of core-shell CdSe-CdS nanorods or quantum rods (QRs), both sphere (CdSe) in rod (CdS) and rod (CdSe) in rod (CdS) have been synthesized in a seededgrowth approach using a very efficient and highly thermally stable steroidal cadmium precursor replacing the more common CdO: cadmium deoxycholate. The core-shell QRs display high photoluminescence quantum yields (40-75%) and high molar absorption co-efficient (ϵ = 10 6 M À 1 cm À 1 ). Sphere-in-rods QRs can be co-assembled with the organogelator diethylaminolithocholyl iodide in 1,2-dichlorobenzene and with the hydrogelator calcium cholate in water to form hybrid gels. These organic-inorganic hybrid soft materials are translucent and brightly red-luminescent. The nanofibers composing the gel network act as a scaffold to support the dispersed QRs and impede their self-aggregation. Furthermore, formation of original wire-like assemblies of the nanorods is promoted in these gels, in particular in the hydrogel. This orientation occurs by a QR tip-to-tip interaction and is proposed to be driven by the amphiphilic behaviour of the QRs: laterally capped by negatively charged TGA (thioglycolic acid) ligands and un-capped on the tips due to TGA unbinding. The combination of nanofiberforming hydrogelators and elongated quantum rods is promising in the perspective to form hybrid nanostructures with anisotropic optic or electronic properties.

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“…The preparation of BaB 2 O 4 luminescent materials by the wet chemical method is divided into two steps, the first step involves the preparation of the precursors, and the second step is the heat treatment of the precursors. It was reported that the composition and morphology of the precursors have a greater impact on that of the final products; therefore, the study of the precursors is important for us to understand the mechanism of the first and second steps.…”

Section: Introductionmentioning

confidence: 99%

Two‐ step synthesis and luminescent properties of BaB₂O₄:Eu³⁺ nano/microphosphors prepared from Ba‐B‐O:Eu³⁺ precursor

et al. 2019

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The BaB 2 O 4 :Eu 3+ nano/microphosphors with sphere-, rod-, and granular-like morphologies were successfully obtained by a two-step method using Ba-B-O:Eu 3+ as the precursor. The structure, morphology and photoluminescent properties of the products were characterized by Fourier transfer infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetry-differential thermal analysis (TG-DTA), scanning electron microscopy (SEM) and photoluminescence (PL). The formation mechanisms of Ba-B-O:Eu 3+ and BaB 2 O 4 :Eu 3+ were proposed. The results show that the BaB 2 O 4 :Eu 3+ could retain the original morphologies of their respective precursors largely. The BaB 2 O 4 :Eu 3+ prepared by this two-step method exhibited better morphology, smaller particle size and better crystallinity than when prepared by a solid-state method. The granular-like BaB 2 O 4 :Eu 3+ red phosphor prepared by this two-step method exhibited stronger PL intensity and better red color purity than when prepared by a solid-state method. morphologies were prepared by calcination of Ba-B-O:Eu 3+ precursor, and the relationship between the morphology of Ba-B-O:Eu 3+ and BaB 2 O 4 :Eu 3+ was studied. The luminescent properties of BaB 2 O 4 :Eu 3+ were also studied. In addition, a comparative study on this twostep method and the conventional solid-state method was carried out. | EXPERIMENTALThe Ba-B-O:Eu 3+ precursors were synthesized by an hydrothermal method and a supersonic co-precipitation method. In the procedure for preparing sphere-like Ba-B-O:Eu 3+ (Ba-B-O-S), 6 mmol of BaCl 2 ·2H 2 O, 5% mol of Eu(NO 3 ) 3 ·6H 2 O and 9 mmol of Na 2 B 4 O 7 ·10H 2 O were dissolved in 50 mL of water (H 2 O). After stirring for 0.5 h, the mixture was transferred into an autoclave and reacted at 180°C for 48 h, and then the precipitate was washed and dried at 40°C for 24 h. In the procedure for preparing rod-like Ba-B-O:Eu 3+ (Ba-B-O-R), 4 mmol of BaCl 2 ·2H 2 O, 6 mmol of Na 2 B 4 O 7 ·10H 2 O, 8 mmol of sodium hydroxide (NaOH) and 5% mol of Eu(NO 3 ) 3 ·6H 2 O were dissolved in 50 mL H 2 O. After stirring for 0.5 h, the slurry was transferred to an autoclave and maintained at 160°C for 12 h. The precipitate was washed and dried at 40°C for 24 h. In the procedure for preparing granular-like Ba-B-O:Eu 3+ (Ba-B-O-G), 3 mmol of Ba (NO 3 ) 2 , 3 mmol of Na 2 B 4 O 7 ·10H 2 O, 7 mmol of NaOH and 5% mol of Eu(NO 3 ) 3 ·6H 2 O were dissolved in 80 mL H 2 O. After stirring for 0.5 h, the mixture was placed into an ultrasonic reactor and reacted at 80°C for 72 h, and then the precipitate was washed and dried at 40°C for 24 h. The BaB 2 O 4 : Eu 3+ which were named BBO-S, BBO-R and BBO-G were synthesized by calcining the Ba-B-O-S, Ba-B-O-R and Ba-B-O-G products at 800°C for 4 h, respectively. For comparison, the BaB 2 O 4 :Eu 3+ (BBO-B) was prepared by the solid-state method at 800°C for 4 h using BaCO 3 , H 3 BO 3 and Eu 2 O 3 (99.99%) as the raw materials. X-ray diffraction (XRD) data were collected using a Rigaku D/MAX-C X-ray diffractor with Cu Kα. The Fourier t...

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Cadmium deoxycholate: a new and efficient precursor for highly luminescent CdSe nanocrystals

Cited by 21 publications

References 37 publications

Continuous synthesis of high quality CdSe quantum dots in supercritical fluids

Continuous synthesis of high quality CdSe quantum dots in supercritical fluids

Wire‐Like Tip‐To‐Tip Linked Assemblies of CdSe‐CdS Quantum Rods Promoted on Supramolecular Nanofibers of Hybrid Organo‐ and Hydrogels

Two‐ step synthesis and luminescent properties of BaB₂O₄:Eu³⁺ nano/microphosphors prepared from Ba‐B‐O:Eu³⁺ precursor

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Cadmium deoxycholate: a new and efficient precursor for highly luminescent CdSe nanocrystals

Cited by 21 publications

References 37 publications

Continuous synthesis of high quality CdSe quantum dots in supercritical fluids

Continuous synthesis of high quality CdSe quantum dots in supercritical fluids

Wire‐Like Tip‐To‐Tip Linked Assemblies of CdSe‐CdS Quantum Rods Promoted on Supramolecular Nanofibers of Hybrid Organo‐ and Hydrogels

Two‐ step synthesis and luminescent properties of BaB2O4:Eu3+ nano/microphosphors prepared from Ba‐B‐O:Eu3+ precursor

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Two‐ step synthesis and luminescent properties of BaB₂O₄:Eu³⁺ nano/microphosphors prepared from Ba‐B‐O:Eu³⁺ precursor