1
|
Spataro G, Champouret Y, Coppel Y, Kahn ML. Prominence of the Instability of a Stabilizing Agent in the Changes in Physical State of a Hybrid Nanomaterial. Chemphyschem 2020; 21:2454-2459. [PMID: 32893945 DOI: 10.1002/cphc.202000584] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 09/07/2020] [Indexed: 12/22/2022]
Abstract
Shaping ability of hybrid nanomaterials is a key point for their further use in devices. It is therefore crucial to control it. To this end, it is necessary that the macroscopic properties of the material remain constant over time. Here, we evidence by multinuclear Magic-Angle Spinning Nuclear Magnetic Resonance spectroscopic study including 17 O isotope exchange that for a ZnO-alkylamine hybrid material, the partial carbonation of amine into ammonium carbamate molecules is behind the conversion from highly viscous liquid to a powdery solid when exposed to air. This carbonation induces modification and reorganization of the organic shell around the nanocrystals and affects significantly the macroscopic properties of the material such as it physical state, its solubility and colloidal stability. This study, straightforwardly extendable, highlights that the nature of the functional chemical group allowing connecting the stabilizing agent (SA) to the surface of the nanoparticles is of tremendous importance especially if the SA is reactive with molecules present in the environment.
Collapse
Affiliation(s)
- Grégory Spataro
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, University of Toulouse, 205 route de Narbonne, 31077, Toulouse, France
| | - Yohan Champouret
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, University of Toulouse, 205 route de Narbonne, 31077, Toulouse, France
| | - Yannick Coppel
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, University of Toulouse, 205 route de Narbonne, 31077, Toulouse, France
| | - Myrtil L Kahn
- Laboratoire de Chimie de Coordination, CNRS UPR 8241, University of Toulouse, 205 route de Narbonne, 31077, Toulouse, France
| |
Collapse
|
2
|
Champouret Y, Spataro G, Coppel Y, Gauffre F, Kahn ML. Nanocrystal-ligand interactions deciphered: the influence of HSAB and p K a in the case of luminescent ZnO. NANOSCALE ADVANCES 2020; 2:1046-1053. [PMID: 36133033 PMCID: PMC9418476 DOI: 10.1039/c9na00769e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Accepted: 02/10/2020] [Indexed: 06/16/2023]
Abstract
Despite all the efforts made by the scientific community to rationalize the interaction of organic molecules with nanocrystals (Ncs), we are still at the level of the empirical recipe when the material behavior in solution is concerned. In an effort to address this issue, the analysis of the luminescence measurements of ZnO Ncs in the presence of various organic substrates using a Langmuir adsorption model was carried out to determine for the first time the affinity constants and the number of binding sites as well as to rank the interaction strengths of these substrates with regard to ZnO Ncs. The results were confirmed by NMR spectroscopic studies, which, besides, provided a deep understanding of the substrate-ZnO Nc interactions. Analysis of the results using pK a and HSAB theory demonstrates that the interaction of a given substrate can be determined by its pK a versus the pK a of the organic molecules present at the surface of pristine Ncs and that the hard or soft character of the substrates can govern the emission intensity of the ZnO Ncs.
Collapse
Affiliation(s)
- Yohan Champouret
- Laboratoire de Chimie de Coordination UPR8241, CNRS 205 Rte de Narbonne 31000 Toulouse Cedex 04 France
| | - Grégory Spataro
- Laboratoire de Chimie de Coordination UPR8241, CNRS 205 Rte de Narbonne 31000 Toulouse Cedex 04 France
| | - Yannick Coppel
- Laboratoire de Chimie de Coordination UPR8241, CNRS 205 Rte de Narbonne 31000 Toulouse Cedex 04 France
| | | | - Myrtil L Kahn
- Laboratoire de Chimie de Coordination UPR8241, CNRS 205 Rte de Narbonne 31000 Toulouse Cedex 04 France
| |
Collapse
|
3
|
Bai X, Sun B, Wang X, Zhang T, Hao Q, Ni BJ, Zong R, Zhang Z, Zhang X, Li H. Defective crystal plane-oriented induced lattice polarization for the photocatalytic enhancement of ZnO. CrystEngComm 2020. [DOI: 10.1039/c9ce01966a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The mechanism of the photocatalytic reaction of defective ZnO systems was determined.
Collapse
Affiliation(s)
- Xiaojuan Bai
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control
- Beijing University of Civil Engineering and Architecture
- Beijing 100044
- China
| | - Boxuan Sun
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control
- Beijing University of Civil Engineering and Architecture
- Beijing 100044
- China
| | - Xuyu Wang
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control
- Beijing University of Civil Engineering and Architecture
- Beijing 100044
- China
| | - Tianshuo Zhang
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control
- Beijing University of Civil Engineering and Architecture
- Beijing 100044
- China
| | - Qiang Hao
- Centre for Technology in Water and Wastewater (CTWW)
- School of Civil and Environmental Engineering
- University of Technology Sydney (UTS)
- Sydney
- Australia
| | - Bing-Jie Ni
- Centre for Technology in Water and Wastewater (CTWW)
- School of Civil and Environmental Engineering
- University of Technology Sydney (UTS)
- Sydney
- Australia
| | - Ruilong Zong
- Department of Chemistry
- Tsinghua University
- Beijing
- P. R. China
| | - Ziyang Zhang
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control
- Beijing University of Civil Engineering and Architecture
- Beijing 100044
- China
| | - Xiaoran Zhang
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control
- Beijing University of Civil Engineering and Architecture
- Beijing 100044
- China
| | - Haiyan Li
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control
- Beijing University of Civil Engineering and Architecture
- Beijing 100044
- China
| |
Collapse
|
4
|
Lin W, Schmidt J, Mahler M, Schindler T, Unruh T, Meyer B, Peukert W, Segets D. Influence of Tail Groups during Functionalization of ZnO Nanoparticles on Binding Enthalpies and Photoluminescence. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:13581-13589. [PMID: 29099602 DOI: 10.1021/acs.langmuir.7b03079] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report on the tailoring of ZnO nanoparticle (NP) surfaces by catechol derivatives (CAT) with different functionalities: tert-butyl group (tertCAT), hydrogen (pyroCAT), aromatic ring (naphCAT), ester group (esterCAT), and nitro group (nitroCAT). The influence of electron-donating/-withdrawing properties on enthalpy of ligand binding (ΔH) was resolved and subsequently linked with optical properties. First, as confirmed by ultraviolet/visible (UV/vis) and Fourier transform infrared (FT-IR) spectroscopy results, all CAT molecules chemisorbed to ZnO NPs, independent of the distinct functionality. Interestingly, the ζ-potentials of ZnO after functionalization shifted to more negative values. Then, isothermal titration calorimetry (ITC) and a mass-based method were applied to resolve the heat release during ligand binding and the adsorption isotherm, respectively. However, both heat- and mass-based approaches alone did not fully resolve the binding enthalpy of each molecule adsorbing to the ZnO surface. This is mainly due to the fact that the Langmuir model oversimplifies the underlying adsorption mechanism, at least for some of the tested CAT molecules. Therefore, a new, fitting-free approach was developed to directly access the adsorption enthalpy per molecule during functionalization by dividing the heat release measured via ITC by the amount of bound molecules determined from the adsorption isotherm. Finally, the efficiency of quenching the visible emission caused by ligand binding was investigated by photoluminescence (PL) spectroscopy, which turned out to follow the same trend as the binding enthalpy. Thus, the functionality of ligand molecules governs the binding enthalpy to the particle surface, which in turn, at least in the current case of ZnO, is an important parameter for the quenching of visible emission. We believe that establishing such correlations is an important step toward a more general way of selecting and designing ligand molecules for surface functionalization. This allows developing strategies for tailored colloidal surfaces beyond empirically driven formulation on a case by case basis.
Collapse
Affiliation(s)
- Wei Lin
- Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) , Cauerstraße 4, 91058 Erlangen, Germany
- Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) , Haberstraße 9a, 91058 Erlangen, Germany
| | - Jochen Schmidt
- Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) , Cauerstraße 4, 91058 Erlangen, Germany
- Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) , Haberstraße 9a, 91058 Erlangen, Germany
| | - Michael Mahler
- Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) , Cauerstraße 4, 91058 Erlangen, Germany
| | - Torben Schindler
- Chair of Crystallography and Structural Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) , Staudtstraße 3, 91058 Erlangen, Germany
| | - Tobias Unruh
- Chair of Crystallography and Structural Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) , Staudtstraße 3, 91058 Erlangen, Germany
| | - Bernd Meyer
- Interdisciplinary Center for Molecular Materials (ICMM) and Computer-Chemistry-Center (CCC), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) , Nägelsbachstraße 25, 91052 Erlangen, Germany
| | - Wolfgang Peukert
- Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) , Cauerstraße 4, 91058 Erlangen, Germany
- Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) , Haberstraße 9a, 91058 Erlangen, Germany
| | - Doris Segets
- Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) , Cauerstraße 4, 91058 Erlangen, Germany
- Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) , Haberstraße 9a, 91058 Erlangen, Germany
| |
Collapse
|