Synthesis and functionalization of silicon nanocrystals by means of non-thermal plasmas

Lorenzo Mangolini, Uwe Kortshagen

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A gas-phase, non-thermal plasma approach for the synthesis of silicon quantum dots is presented. An alternative surface passivation technique is the grafting of organic molecules onto the hydrogen-terminated surface of the as-produced nanocrystals. Two different approaches were studied for this purpose. The first approach is a liquid-phase thermal reaction. The silicon particles have been collected on the usual stainless steel filter, then sonicated into a 5:1 mixture of mesitylene and 1-dodecene. The transfer from the system to the solution is done under air-exclusion by using a nitrogen purged glove bag mounted onto the system exhaust line. The liquid-phase reaction proceeds at the solvent boiling temperature and a clear colloidal solution of silicon nanoparticles is obtained in a few minutes. After hydrosilylation the particles can be dried and redispersed into non-polar solvents. The improved liquid-phase processibility of the material makes it very interesting for printed electronics applications. For liquid-phase hydrosilylated material, quantum yield values are presented exceeding 60% for samples with a peak emission wavelength around 800 nm. The second approach for the passivation of the silicon nanoparticle surface is a gas-phase approach. Gas-phase treatment avoids the use of solvents from the production scheme and allows a significant reduction in production time. The use of a second non-thermal plasma to provide the necessary reaction activation energy is presented. The same molecule used for the liquid-phase passivation, 1-dodecene, is fed into a second-stage plasma reactor using a bubbler system. This is an abstract of a paper presented at the AIChE Annual Meeting (Salt Lake City, UT 11/4-9/2007).

Original languageEnglish (US)
Title of host publication2007 AIChE Annual Meeting
StatePublished - Dec 1 2007
Event2007 AIChE Annual Meeting - Salt Lake City, UT, United States
Duration: Nov 4 2007Nov 9 2007

Publication series

Name2007 AIChE Annual Meeting


Other2007 AIChE Annual Meeting
CountryUnited States
CitySalt Lake City, UT

Fingerprint Dive into the research topics of 'Synthesis and functionalization of silicon nanocrystals by means of non-thermal plasmas'. Together they form a unique fingerprint.

Cite this