Dopamine Adsorption on TiO<sub>2</sub> Anatase Surfaces

Urdaneta, Inés; Keller, A.; Atabek, O.; Palma, Julio L.; Finkelstein-Shapiro, Daniel; Tarakeshwar, P.; Mújica, Vladimiro; Calatayud, Mònica

doi:10.1021/jp506156e

Cited by 50 publications

(41 citation statements)

References 37 publications

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“…52,53 Urdaneta et al investigated the adsorption of dopamine in a low coverage regime, by considering uniquely a bidentate configuration on different low index anatase surfaces. 54…”

Section: Introductionmentioning

confidence: 99%

Proton Transfers at a Dopamine-Functionalized TiO₂ Interface

et al. 2018

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Despite the many successful syntheses and applications of dopamine-functionalized TiO 2 nanohybrids, there has not yet been an atomistic understanding of the interaction of this 1,2-dihydroxybenzene derivative ligand with the titanium dioxide surfaces. In this work, on the basis of a wide set of dispersion-corrected hybrid density functional theory (DFT) calculations and density functional tight binding (DFTB) molecular dynamics simulations, we present a detailed study of the adsorption modes, patterns of growth, and configurations of dopamine on the anatase (101) TiO 2 surface, with reference to the archetype of 1,2-dihydroxybenzene ligands, i.e., catechol. At low coverage, the isolated dopamine molecule prefers to bend toward the surface, coordinating the NH 2 group to a Ti 5c ion. At high coverage, the packed molecules succeed in bending toward the surface only in some monolayer configurations. When they do, we observe a proton transfer from the surface to the ethyl-amino group, forming terminal NH 3 + species, which highly interact with the O atoms of a neighboring dopamine molecule. This strong Coulombic interaction largely stabilizes the self-assembled monolayer. On the basis of these results, we predict that improving the probability of dopamine molecules being free to bend toward the surface through thermodynamic versus kinetic growth conditions will lead to a monolayer of fully protonated dopamine molecules.

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“…52,53 Urdaneta et al investigated the adsorption of dopamine in a low coverage regime, by considering uniquely a bidentate configuration on different low index anatase surfaces. 54…”

Section: Introductionmentioning

confidence: 99%

Proton Transfers at a Dopamine-Functionalized TiO₂ Interface

et al. 2018

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“…16 Second, theoretical calculations have revealed the possible interaction between TiO 2 and dopamine (DA). 17,18 Inspired by the unique characteristic of the core-shell structures, in which a direct contact between TiO 2 and DA can be guaranteed and maximized through a synthesis control, we therefore managed to coat the TiO 2 cores by using PDA nanoshells. Briefly, TiO 2 @PDA was formed by a seeded-growth method with anatase TiO 2 nanoparticles as the core material, which were then encapsulated by PDA through the oxidative self-polymerization of dopamine (Fig.…”

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confidence: 99%

Core–shell structured TiO₂@polydopamine for highly active visible-light photocatalysis

et al. 2016

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“…Recently, facet engineering has been used for improving the SERS behavior of plasmon-free materials [69,70]. For example, compared with much less affinity for the {101} TiO 2 , Urdaneta et al reported a selective adsorption of dopamine (DA) on the {001} and {100} terminations, which was consistent with the CT associated to the SERS effect [182]. Guo et al from DA molecules adsorbed on a symmetric prickly {201} TiO 2 , which is three orders of magnitude higher than that on asymmetric {001}, {101}, and {100} TiO 2 (Fig.…”

Section: Facet Engineeringmentioning

confidence: 96%

The origin of ultrasensitive SERS sensing beyond plasmonics

et al. 2021

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Plasmon-free surface-enhanced Raman scattering (SERS) substrates have attracted tremendous attention for their abundant sources, excellent chemical stability, superior biocompatibility, good signal uniformity, and unique selectivity to target molecules.Recently, researchers have made great progress in fabricating novel plasmon-free SERS substrates and exploring new enhancement strategies to improve the sensitivity of plasmon-free SERS substrates. This review summarizes the recent developments of plasmon-free SERS substrates and specially focuses on the enhancement mechanisms and the enhancement strategies. Furthermore, the promising applications of plasmon-free SERS substrates in biomedical diagnosis, metal ions and organic pollutants sensing, chemical and biochemical reactions monitoring, and photoelectric characterization are introduced. Finally, the current challenges and future research opportunities in plasmon-free SERS substrates are briefly discussed.

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Dopamine Adsorption on TiO₂ Anatase Surfaces

Cited by 50 publications

References 37 publications

Proton Transfers at a Dopamine-Functionalized TiO₂ Interface

Proton Transfers at a Dopamine-Functionalized TiO₂ Interface

Core–shell structured TiO₂@polydopamine for highly active visible-light photocatalysis

The origin of ultrasensitive SERS sensing beyond plasmonics

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Dopamine Adsorption on TiO2 Anatase Surfaces

Cited by 50 publications

References 37 publications

Proton Transfers at a Dopamine-Functionalized TiO2 Interface

Proton Transfers at a Dopamine-Functionalized TiO2 Interface

Core–shell structured TiO2@polydopamine for highly active visible-light photocatalysis

The origin of ultrasensitive SERS sensing beyond plasmonics

Contact Info

Product

Resources

About

Dopamine Adsorption on TiO₂ Anatase Surfaces

Proton Transfers at a Dopamine-Functionalized TiO₂ Interface

Proton Transfers at a Dopamine-Functionalized TiO₂ Interface

Core–shell structured TiO₂@polydopamine for highly active visible-light photocatalysis