Adsorption and Thermal Stability of Phenylphosphonic Acid on Cerium Oxides

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10510545" target="_blank" >RIV/00216208:11320/25:10510545 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=MuR3vzHaXW" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=MuR3vzHaXW</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.5c04065" target="_blank" >10.1021/acs.jpcc.5c04065</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Adsorption and Thermal Stability of Phenylphosphonic Acid on Cerium Oxides

Popis výsledku v původním jazyce

This paper reports on a study of the adsorption and thermal stability of phenylphosphonic acid (PPA) adsorbed by physical vapor deposition on the surfaces of epitaxial cerium oxide films of different structure, stoichiometry and composition. Advanced analytical methods based on photoelectron spectroscopy combined with DFT calculations showed that the binding of PPA to cerium oxide is through the phosphonate group, while the decomposition temperature is defined by the nature of the oxide. Tridentate PPA species are present on all substrates (CeO2, CeO1.7, Ce2O3, and Ce6WO12), indicating a strong affinity of PPA for cerium oxide. The presence of vacancies in the oxide influences the molecular orientation. The phenyl ring of the PPA tilts about 10 degrees more toward the surface plane of the reduced cerium oxides compared to CeO2, which is attributed to the adsorption of phosphonate groups on Ce4+ and Ce3+ cations. The PPA adlayer is more stable on the surfaces with higher concentrations of oxygen vacancies and/or Ce3+ cations, increasing the temperature to initiate cleavage of the P-C bond from 225 degrees C for PPA/CeO2 to 350 degrees C for the other systems. The PPA decomposition is signaled by the desorption of carbonaceous species above a critical temperature, while the phosphorus species remain stable even after annealing at 450 degrees C for all the cerium oxides. Overall, the results provide a comprehensive understanding of the binding of PPA to cerium oxides, allowing further development of functionalization strategies for inorganic materials by phosphonic acids.

Název v anglickém jazyce

Adsorption and Thermal Stability of Phenylphosphonic Acid on Cerium Oxides

Popis výsledku anglicky

This paper reports on a study of the adsorption and thermal stability of phenylphosphonic acid (PPA) adsorbed by physical vapor deposition on the surfaces of epitaxial cerium oxide films of different structure, stoichiometry and composition. Advanced analytical methods based on photoelectron spectroscopy combined with DFT calculations showed that the binding of PPA to cerium oxide is through the phosphonate group, while the decomposition temperature is defined by the nature of the oxide. Tridentate PPA species are present on all substrates (CeO2, CeO1.7, Ce2O3, and Ce6WO12), indicating a strong affinity of PPA for cerium oxide. The presence of vacancies in the oxide influences the molecular orientation. The phenyl ring of the PPA tilts about 10 degrees more toward the surface plane of the reduced cerium oxides compared to CeO2, which is attributed to the adsorption of phosphonate groups on Ce4+ and Ce3+ cations. The PPA adlayer is more stable on the surfaces with higher concentrations of oxygen vacancies and/or Ce3+ cations, increasing the temperature to initiate cleavage of the P-C bond from 225 degrees C for PPA/CeO2 to 350 degrees C for the other systems. The PPA decomposition is signaled by the desorption of carbonaceous species above a critical temperature, while the phosphorus species remain stable even after annealing at 450 degrees C for all the cerium oxides. Overall, the results provide a comprehensive understanding of the binding of PPA to cerium oxides, allowing further development of functionalization strategies for inorganic materials by phosphonic acids.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

1932-7455

Svazek periodika

129

Číslo periodika v rámci svazku

34

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

17

Strana od-do

15265-15281

Kód UT WoS článku

001549277800001

EID výsledku v databázi Scopus

2-s2.0-105024936719