TY - JOUR
T1 - Reactions of hydrazoic acid and trimethylindium on TiO2 rutile (110) surface
T2 - A computational study on the formation of the first monolayer InN
AU - Wang, Jeng Han
AU - Lin, M. C.
PY - 2006/2/9
Y1 - 2006/2/9
N2 - This Article reports the result of a computational study on the reaction of hydrazoic acid and trimethylindium (TMIn), coadsorbed on TiO2 rutile (110) surface. The adsorption geometries and energies of possible adsorbates including HN3-In(CH3)3(a) and its derivatives, HN3-In(CH3)2(a), N3-In(CH 3)2(a), N3-In(CH3)(a), and N-In(a), have been predicted by first-principles calculations based on the density functional theory (DFT) and the pseudopotential method. The mechanisms of these surface reactions have also been explicitly elucidated with the computed potential energy surfaces. Starting from the interaction of three stable HN 3 adsorbates, HN3-Ob(a), H(N 2)N-Ob(a), and Ti-NN(H)N-Ob(a), where O b is the bridged O site on the surface, with two stable intermediates from the adsorption and dissociative adsorption of TMIn, (H3C) 3In-Ob(a) and (H3C)2In-Ob(a) + H3C-Ob(a), InN products can be formed exothermically via four reaction paths following the initial barrierless In-atom association with the N atom directly bonded to H, by CH4 elimination (with ∼40 kcal/mol barriers), the InN-N bond breaking and the final CH3 elimination or migration (with <20 kcal/mol barriers). These Langmuir - Hinshelwood processes producing the two most stable InN(a) side-on adsorptions confirm that HN3 and TMIn are indeed very efficient precursors for the deposition of InN films on TiO2 nanoparticles. The result of similar calculations for the reactions occurring by the Rideal - Eley mechanism involving HN3(a) + TMIn(g) and HN3(g) + TMIn(a) indicates that they are energetically less favored and produce the less stable InN(a) with end-on configurations.
AB - This Article reports the result of a computational study on the reaction of hydrazoic acid and trimethylindium (TMIn), coadsorbed on TiO2 rutile (110) surface. The adsorption geometries and energies of possible adsorbates including HN3-In(CH3)3(a) and its derivatives, HN3-In(CH3)2(a), N3-In(CH 3)2(a), N3-In(CH3)(a), and N-In(a), have been predicted by first-principles calculations based on the density functional theory (DFT) and the pseudopotential method. The mechanisms of these surface reactions have also been explicitly elucidated with the computed potential energy surfaces. Starting from the interaction of three stable HN 3 adsorbates, HN3-Ob(a), H(N 2)N-Ob(a), and Ti-NN(H)N-Ob(a), where O b is the bridged O site on the surface, with two stable intermediates from the adsorption and dissociative adsorption of TMIn, (H3C) 3In-Ob(a) and (H3C)2In-Ob(a) + H3C-Ob(a), InN products can be formed exothermically via four reaction paths following the initial barrierless In-atom association with the N atom directly bonded to H, by CH4 elimination (with ∼40 kcal/mol barriers), the InN-N bond breaking and the final CH3 elimination or migration (with <20 kcal/mol barriers). These Langmuir - Hinshelwood processes producing the two most stable InN(a) side-on adsorptions confirm that HN3 and TMIn are indeed very efficient precursors for the deposition of InN films on TiO2 nanoparticles. The result of similar calculations for the reactions occurring by the Rideal - Eley mechanism involving HN3(a) + TMIn(g) and HN3(g) + TMIn(a) indicates that they are energetically less favored and produce the less stable InN(a) with end-on configurations.
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U2 - 10.1021/jp055659b
DO - 10.1021/jp055659b
M3 - Article
AN - SCOPUS:33644745544
SN - 1520-6106
VL - 110
SP - 2263
EP - 2270
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 5
ER -