Layer-by-layer assembly of luminescent multilayer thin films by MMT, anionic chromophores and magnetic CoAl-LDHs nanosheets
Introduction
Layered materials are attractive targets for their rich fundamental physics and potential applications in future multifunctional devices, and the nanosheets of those have been used as building units for making new designed nanomaterials due to their intrinsic unique two-dimensional structure [1], [2], [3], [4]. As for LDHs and MMT, several groups have just done many profound researches by using naonosheets with two-dimensional arrays which can provide a rigid and stable environment [5], [6], [7], [8], [9], [10]. However, various different inorganic nanosheets possibly have certain natural features, such as LDHs exhibit permanent positive charge and MMT׳ nanosheets are evolved as permanent negative charge that can be delocalized over the entire layer surface, due to an isomorphic substitution [10], [11]. But there was no relational report about taking full advantage of the nanosheets׳ charge, until our group [12] successfully confirmed that electronic microenvironment, which is assembled by oppositely-charged nanosheets between the interlayer, is fairly beneficial for enhancing the lifetimes of MTFs containing luminescent cations. On the other hand, transition metal-bearing LDHs׳ nanosheets can act as nanoscale ferromagnetic layers, and their multilayer assemblies exhibit significant magneto-optical response [9], [10], [13]. And then, our present work confirmed that MF also can improve the optical property in coordination with EME, especially the lifetimes of MTFs [14]. Herein, in this paper, what we are most interested in are whether anionic luminescent polymers can be designed for intercalating into EME and MF environments, and whether they can be affected by the different ferromagnetic inorganic nanosheets on the optical properties.
In this work, a luminescent π-conjugated anionic polymer poly [5-methoxy-2-(3-sulfopropoxy)-1,4-phenylenevinylene] potassium (APPV) was assembled with the CoAl-LDHs nanosheets and MMT nanosheets to fabricate multilayer thin films (MTFs), respectively. In the nano-system, as the assembled nano-architecture can provide an EME and the CoAl-LDHs can offer a constant MF to the chromophores (Fig. 1), the MTFs exhibit remarkable optical properties with reasonably longer luminescent lifetimes. Herein, this work successfully fabricates the MTFs with EME and MF′, which can promote the hybrid systems with various functions, and confirm the concept about the EME and MF effecting chromophores simultaneously.
Section snippets
Results and discussion
We selected the luminescent π-conjugated anionic polymer to assemble with different ferromagnetic inorganic nanosheets, in order to confirm the universality of the novel concept about EME and MF effecting the more series chromophores. The UV–visible absorption spectra of (CoAl-LDHs/APPV@PVA)n MTFs with varying numbers of assembly steps are shown in Fig. 2a, and the intensity of absorption peaks exhibit correlate linearly with the deposition cycles (Fig. 2a, inset), demonstrating a stepwise and
Conclusions
To sum up, this work successfully confined anionic chromophores in the oppositely-charged and magnetic inorganic layer hosts. Importantly, it successfully demonstrates that the EME and MF formed by the different ferromagnetic inorganic nanosheets are fairly beneficial for enhancing the luminescent lifetimes of MTFs containing anionic chromophores. Therefore, the as-fabricated MTFs are expected to have much flexibility and be potential for manipulating, controlling and developing novel
Acknowledgments
This work was supported partially by the National Natural Science Foundation of China (Grant no. 40802013), Key Projects in the National Science & Technology Pillar Program (Grant no. 2006BAD10B04), the Fundamental Research Funds for the Central Universities (Grant no. 2011YXL058).
References (14)
- et al.
Polymer–inorganic supramolecular nanohybrids for red, white, green, and blue applications
Prog Polym Sci
(2013) - et al.
Synthesis, evolution and hydrogen storage properties of ZnV2O4 glomerulus nano/microspheres: a prospective material for energy storage
Int J Hydrogen Energy
(2014) - et al.
Synthesis of novel ZnV2O4 hierarchical nanospheres and their applications as electrochemical supercapacitor and hydrogen storage material
ACS Appl Mater Interfaces
(2014) - et al.
Synthesis of novel ZnV2O4 spinel oxide nanosheets and their hydrogen storage properties
CrystEngComm
(2014) - et al.
Ultrastrong and stiff layered polymer nanocomposites
Science
(2007) - et al.
Recent advances in the synthesis and application of layered double hydroxide (LDH) nanosheets
Chem Rev
(2011) - et al.
Anionic poly(p-phenylenevinylene)/layered double hydroxide ordered ultrathin films with multiple quantum well structure: a combined experimental and theoretical study
Langmuir
(2010)
Cited by (10)
Layer-by-layer assembly of luminescent ultrathin films by Mg-Al-Eu LDHs nanosheets and organic ligand with high transparency
2016, Optical MaterialsCitation Excerpt :Duan’s group successfully used LDHs nanosheets to assemble photoemissive thin-film which can suppress the chromophores’ π–π stacking and thus make organic photofunctional molecules show excellent optical properties [13,15–18]. Liu’s team also utilized transition metal-bearing LDHs and montmorillonite (MMT) to assemble a novel luminescent multiple ordered thin-film with ultra-prolonged lifetime [19–21]. This is because that the chromophores were confined in the oppositely-charged inorganic layer hosts.
Preparation of transparent BaSO<inf>4</inf> nanodispersions by high-gravity reactive precipitation combined with surface modification for transparent X-ray shielding nanocomposite films
2021, Frontiers of Chemical Science and EngineeringPreparation and properties of polylactic acid-based composite fluorescent membrane based on layer-by-layer assembly
2019, Express Polymer Letters
- 1
Tel./fax: +86 10 8232 2759.