Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Substrate/surface characterization spectrometry

Block and co-workers [35] modified the atom probe to develop a method called pulsed-field desorption mass spectrometry (PFDMS), whereby a short high-voltage pulse desorbs all species present on the tip during a catalytic reaction. The repetition frequency of the field pulse controls the time for which the reaction is allowed to proceed. Hence, by varying the repetition frequency between desorption pulses in a systematic way, one can study the kinetics of a surface reaction [35], In fact, this type of experiment - where one focuses on a facet of desired structure, which may include steps and defects - comes close to one of the fundamental goals of catalyst characterization, namely studying a catalytic reaction on substrates of atomically resolved structure with high time resolution. [Pg.197]

One of the most important recent developments in characterizing SAMs, is the use of MALDI-TOF mass spectrometry to directly image molecules chemisorbed to gold surfaces [230]. In a series of articles, Mrksich and coworkers demonstrated convincingly that the technique is also extremely useful in analyzing reactions on monolayers [231]. No special equipment is necessary and a gold-coated substrate can simply be placed in a standard MALDI mass spectrometer. Any... [Pg.640]


See other pages where Substrate/surface characterization spectrometry is mentioned: [Pg.282]    [Pg.178]    [Pg.195]    [Pg.922]    [Pg.166]    [Pg.180]    [Pg.411]    [Pg.2112]    [Pg.521]    [Pg.922]    [Pg.35]    [Pg.253]    [Pg.254]    [Pg.329]    [Pg.4542]    [Pg.556]    [Pg.280]    [Pg.209]    [Pg.65]    [Pg.209]    [Pg.430]   
See also in sourсe #XX -- [ Pg.39 , Pg.351 , Pg.428 ]




SEARCH



Spectrometry characterization

Substrate characterization

Substrate surface

Substrate/surface characterization

© 2024 chempedia.info