Ferroelectric Particles Generated through a Simple, Room-Temperature Treatment of CdSe Quantum Dots

Wrenn, Toshia L.; McBride, James R.; Mares, Jeremy W.; Rosenthal, Sandra J.

doi:10.1021/acs.chemmater.5b01201

Cited by 5 publications

(7 citation statements)

References 36 publications

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“…As observed in the XRD result, the intensities of the diffraction peaks at 2θ = 14.9, 30.5, and 36.2° in the pattern of Ni 5 P 4 gradually decrease as the intensities of the Ni 2 P diffraction peaks located at 40.8, 75.0, and 80.2° slightly increase with an increase in phosphorus source dosage, which can be ascribed to partial phase transformation from Ni 5 P 4 to Ni 2 P, which is in accordance with the previous report . The peak at the dominant (111) of Ni 2 P shifts toward lower angle direction, which is associated with incremental phosphorus source, resulting in an intensive charge imbalance . This phenomenon is similar for other peaks in Ni 2 P. X-ray photoelectron spectroscopy (XPS) was employed to explore the surface chemical composition and valence states of the as-prepared sample (Figures c,d and S3).…”

Section: Resultssupporting

confidence: 90%

Honeycomb-Like Interconnected Network of Nickel Phosphide Heteronanoparticles with Superior Electrochemical Performance for Supercapacitors

Liu

Sankar

Kundu

et al. 2017

ACS Appl. Mater. Interfaces

133

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Transition-metal-based heteronanoparticles are attracting extensive attention in electrode material design for supercapacitors owing to their large surface-to-volume ratios and inherent synergies of individual components; however, they still suffer from limited interior capacity and cycling stability due to simple geometric configurations, low electrochemical activity of the surface, and poor structural integrity. Developing an elaborate architecture that endows a larger surface area, high conductivity, and mechanically robust structure is a pressing need to tackle the existing challenges of electrode materials. This work presents a supercapacitor electrode consisting of honeycomb-like biphasic Ni 5 P 4 −Ni 2 P (Ni x P y ) nanosheets, which are interleaved by large quantities of nanoparticles. The optimized Ni x P y delivers an ultrahigh specific capacity of 1272 C g −1 at a current density of 2 A g −1 , high rate capability, and stability. An asymmetric supercapacitor employing as-synthesized Ni x P y as the positive electrode and activated carbon as the negative electrode exhibits significantly high power and energy densities (67.2 W h kg −1 at 0.75 kW kg −1 ; 20.4 W h kg −1 at 15 kW kg −1 ). These results demonstrate that the novel nanostructured Ni x P y can be potentially applied in highperformance supercapacitors.

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Section: Resultssupporting

confidence: 90%

Honeycomb-Like Interconnected Network of Nickel Phosphide Heteronanoparticles with Superior Electrochemical Performance for Supercapacitors

Liu

Sankar

Kundu

et al. 2017

ACS Appl. Mater. Interfaces

133

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“…This CdSSe cation exchange synthesis of the ferroelectric nanoparticles was based on the previously reported Wrenn et al cation exchange synthesis on CdSe nanocrystals of the same crystal structure 28 with adjustments made to solvents, concentrations, and cations used. In order to avoid precipitation of cadmium chloride hydrate byproducts during cation exchange, the salts were dissolved in ethanol instead of toluene to form metal chloride precursors (Supporting Information).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…23 In 2015, Wrenn et al discovered that ferroelectric nanoparticles could be synthesized through a room temperature cation exchange process using colloidal cadmium selenide quantum dots (QDs) and antimony(III) chloride dissolved in toluene. 28,29 Similar to previously synthesized ferroelectric nanoparticles, this synthesis allows for the tuning of the ferroelectric properties through variation of the shape and size of the particles. Because cadmium selenide and cadmium sulfide QD syntheses have been thoroughly studied, cation exchange synthesis grants access to control over many precisely defined shapes, sizes, and compositions of ferroelectric nanoparticles.…”

Section: ■ Introductionmentioning

confidence: 98%

“…CdSe nanocrystals are ubiquitous in nanoscience and have been developed for applications in lighting, displays, biology, solar cells, solar concentrators, and lasers. − Unlike their bulk counterparts, semiconductor nanoparticles can be deposited through spin-coating, spray-coating, reel-to-reel printing, and ink-jet printing onto flexible substrates at low temperatures . In 2015, Wrenn et al discovered that ferroelectric nanoparticles could be synthesized through a room temperature cation exchange process using colloidal cadmium selenide quantum dots (QDs) and antimony(III) chloride dissolved in toluene. , Similar to previously synthesized ferroelectric nanoparticles, this synthesis allows for the tuning of the ferroelectric properties through variation of the shape and size of the particles. Because cadmium selenide and cadmium sulfide QD syntheses have been thoroughly studied, cation exchange synthesis grants access to control over many precisely defined shapes, sizes, and compositions of ferroelectric nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

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Modulating Ferroelectric Response in Colloidal Semiconductor Nanocrystals through Cation Exchange

et al. 2019

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We report the appearance of ferroelectric behavior in CdSSe nanocrystals arising from a room-temperature cation exchange of semiconductor nanoparticles. Cation exchange reactions were performed on colloidal CdSSe nanocrystals using antimony, tin, and gold salts. The degree of exchange was determined using scanning transmission electron microscopy–energy-dispersive spectroscopy and the ferroelectric response was measured using a Sawyer-Tower circuit. As the percent exchange of tin(IV) was varied, the ferroelectric properties were optimized at ∼30 and 70% as a result of intracrystal atomic displacements. The amount of disorder can be minimized by selecting the exchange cation that exhibits the largest change in saturation polarization with the least amount of exchange. The ability to tune the structure and ferroelectric response of nanostructures could offer new routes toward the development of ferroelectric random-access memory devices as well as lower the cost of energy-harvesting applications.

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“…CdSe SQDs have attracted more and more attention due to their exceptional photophysical properties such as their size-dependent fluorescence, narrow emission spectra and high quantum yield. 37 However, most previously reported CdSe SQDs are only dispersed in inorganic solvents, 38 which limits their applications. Herein, a two-step procedure was carried out to prepare water-solution CdSe SQDs.…”

Section: Synthesis Of Dual-emitting Microspheresmentioning

confidence: 99%

Dual-emitting quantum dot/carbon nanodot-based nanoprobe for selective and sensitive detection of Fe³⁺ in cells

Wang

Huang

Jiang

et al. 2016

Analyst

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A novel dual-emitting fluorescence probe is developed for rapid and ultrasensitive detection of Fe(3+). The nanoprobe is prepared by coating CdSe semiconductor quantum dots (SQDs) onto the surface of carbon nanodot (CND) doped TiO2 microspheres. The as-prepared nanoprobe exhibits the corresponding dual emissions at 436 and 596 nm for CNDs and CdSe, respectively, under a single excitation wavelength. The blue fluorescence of the CNDs is insensitive to Fe(3+), whereas the orange emission of the CdSe SQDs is functionalized to be selectively quenched by Fe(3+). The intensity ratio of I436/I596 shows a good linear relationship with the concentration of Fe(3+) in the range of 10(-9) to 10(-5) M. The nanoprobe provides an effective platform for the reliable detection of Fe(3+) with a detection limit as low as 10 nM. Besides, this ratiometric nanosensor exhibits good selectivity for Fe(3+) over other metal ions. The results reveal that the nanoprobe could provide a sensitive sensor for rapid detection of Fe(3+) with high selectivity and sensitivity. Moreover, 293T cells are used as models to achieve a potential application as a probe for monitoring Fe(3+) in cells. Thus, these dual-emitting nanoprobes could work as an alternative to conventional fluorescence probes for biolabeling, sensing and other applications.

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Ferroelectric Particles Generated through a Simple, Room-Temperature Treatment of CdSe Quantum Dots

Cited by 5 publications

References 36 publications

Honeycomb-Like Interconnected Network of Nickel Phosphide Heteronanoparticles with Superior Electrochemical Performance for Supercapacitors

Honeycomb-Like Interconnected Network of Nickel Phosphide Heteronanoparticles with Superior Electrochemical Performance for Supercapacitors

Modulating Ferroelectric Response in Colloidal Semiconductor Nanocrystals through Cation Exchange

Dual-emitting quantum dot/carbon nanodot-based nanoprobe for selective and sensitive detection of Fe³⁺ in cells

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Ferroelectric Particles Generated through a Simple, Room-Temperature Treatment of CdSe Quantum Dots

Cited by 5 publications

References 36 publications

Honeycomb-Like Interconnected Network of Nickel Phosphide Heteronanoparticles with Superior Electrochemical Performance for Supercapacitors

Honeycomb-Like Interconnected Network of Nickel Phosphide Heteronanoparticles with Superior Electrochemical Performance for Supercapacitors

Modulating Ferroelectric Response in Colloidal Semiconductor Nanocrystals through Cation Exchange

Dual-emitting quantum dot/carbon nanodot-based nanoprobe for selective and sensitive detection of Fe3+ in cells

Contact Info

Product

Resources

About

Dual-emitting quantum dot/carbon nanodot-based nanoprobe for selective and sensitive detection of Fe³⁺ in cells