Synthesis and On-line Size Control of Silicon Quantum                    Dots

Sublemontier, O.; Kintz, Harold; Lacour, F.; Paquez, X.; Maurice, Vincent; Leconte, Y.; Porterat, D.; Herlin‐Boime, Nathalie; Reynaud, C.

doi:10.14356/kona.2011024

Cited by 11 publications

(8 citation statements)

References 26 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…high-purity Si-NPs can be produced without being exposed to contaminants in a continuous manner. 22,23,[25][26][27][28][29] High conversion efficiency of precursors to Si-NPs is practically important for laser pyrolysis because of the high cost of precursors. To save energy required for operating laser at high power, thermal loss should be reduced by directing the laser beam energy to the chemical conversion of precursors to Si-NPs in an efficient way.…”

Section: Introductionmentioning

confidence: 99%

High-yield synthesis of single-crystal silicon nanoparticles as anode materials of lithium ion batteries via photosensitizer-assisted laser pyrolysis

et al. 2014

View full text Add to dashboard Cite

Single crystal silicon nanoparticles (Si-NPs) of 20 nm were produced via laser pyrolysis with a virtually complete conversion from SiH 4 to Si-NPs. SF 6 was used as the photosensitizer to transfer laser beam energy to silicon precursors, dramatically enhancing crystallinity of Si-NPs and their production efficiency. By using their well-developed crystalline structure, the directional volume expansion of Si-NPs was confirmed during lithiation. Lithiation/delithiation kinetics of our Si-NPs was superior to that of their amorphous counterparts due to the footprinted Li + pathways formed during amorphization.

show abstract

Section: Introductionmentioning

confidence: 99%

High-yield synthesis of single-crystal silicon nanoparticles as anode materials of lithium ion batteries via photosensitizer-assisted laser pyrolysis

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Indeed, the high diffusion coefficient of helium in gases as well as its high thermal conductivity limits particle growth by collision/coagulation. Moreover, high gaseous flow rate accelerates the SiH 4 flow and decreases the time of residence of the growing Si seeds in the reaction zone. , …”

Section: Resultsmentioning

confidence: 99%

“…LCVP is based on the absorption of the infrared radiation emitted by a CO 2 laser by a flow of chemical precursors, leading to their thermal decomposition followed by nanoparticle nucleation and growth by collision assisted process. This very versatile process is particularly efficient for the production of silicon nanoparticles, often obtained in small agglomerates, and many studies report the control of both crystalline properties and size distribution. − Interestingly, this process is also efficient for the synthesis of carbon nanoparticles with controlled organization. , …”

Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Si@C Nanoparticles by Laser Pyrolysis: High-Capacity Anode Material for Lithium-Ion Batteries

Sourice

Quinsac

Leconte

et al. 2015

ACS Appl. Mater. Interfaces

Self Cite

108

View full text Add to dashboard Cite

Carbon-covered silicon nanoparticles (Si@C) were synthesized for the first time by a one-step continuous process in a novel two stages laser pyrolysis reactor. Crystallized silicon cores formed in a first stage were covered in the second stage by a continuous shell mainly consisting in low organized sp(2) carbon. At the Si/C interface silicon carbide is absent. Moreover, the presence of silicon oxide is reduced compared to materials synthesized in several steps, allowing the use of such material as promising anode material in lithium-ion batteries (LIB). Auger Electron Spectroscopy (AES) analysis of the samples at both SiKLL and SiLVV edges proved the uniformity of the carbon coating. Cyclic voltammetry was used to compare the stability of Si and Si@C active materials. In half-cell configuration, Si@C exhibits a high and stable capacity of 2400 mAh g(-1) at C/10 and up to 500 mAh g(-1) over 500 cycles at 2C. The retention of the capacity is attributed to the protective effect of the carbon shell, which avoids direct contact between the silicon surface and the electrolyte.

show abstract

“…The first one is a commercial setup (Atomizer model 3076, TSI Inc.), which produces a diphasic flow composed of an inert carrier gas and the sample in the aerosol form by atomization of a liquid suspension of nanoparticles. The second alternative nanoparticle source is a laser pyrolysis reactor, in which nanoparticles are synthesized in situ in the gas phase [7]. In this case, a small part of the aerosol stream is sampled and driven to the ADLS.…”

Section: Nanoparticle Beam Generationmentioning

confidence: 99%

On-line Monitoring of Nanoparticle Synthesis by Laser-Induced Breakdown Spectroscopy in Vacuum

2016

Self Cite

View full text Add to dashboard Cite

International audienceWe propose a new technique suitable for on-line monitoring of gas phase synthesis of nanoparticles. It is based on aerodynamic focusing of nanoparticles followed by Laser-Induced Breakdown Spectroscopy (LIBS) under vacuum. The laser crosses a beam of particles at low pressure so that the plasma-produced photons to be analyzed are emitted only from the particles. Unlike previous experiments, the background from interaction with the gaseous component is totally eliminated from the collected spectra. Vacuum allows also for easier spectra collection in the UV range. Moreover, as the nanoparticle beam is highly collimated, the optical interface windows are not obstructed by particle deposition and the system can be kept running for hours

show abstract

Synthesis and On-line Size Control of Silicon Quantum Dots

Abstract: The synthesis of silicon quantum dots is performed in the [3-5 nm]

Cited by 11 publications

References 26 publications

High-yield synthesis of single-crystal silicon nanoparticles as anode materials of lithium ion batteries via photosensitizer-assisted laser pyrolysis

High-yield synthesis of single-crystal silicon nanoparticles as anode materials of lithium ion batteries via photosensitizer-assisted laser pyrolysis

One-Step Synthesis of Si@C Nanoparticles by Laser Pyrolysis: High-Capacity Anode Material for Lithium-Ion Batteries

On-line Monitoring of Nanoparticle Synthesis by Laser-Induced Breakdown Spectroscopy in Vacuum

Contact Info

Product

Resources

About