Advanced Materials Interfaces

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ISSN / EISSN : 2196-7350 / 2196-7350
Published by: Wiley-Blackwell (10.1002)
Total articles ≅ 4,392
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Yuedong Gong, Yi Li, Jianguo Chen, Hui Guo, Chenwei Sun, Chun Li, Ruiguo Cao, Shuhong Jiao, Lu Huang, Weiguang Yang, et al.
Published: 11 October 2021
Advanced Materials Interfaces; https://doi.org/10.1002/admi.202101227

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Wenxu Shang, Wentao Yu, Yanyi Ma, Yi He, Zhongxi Zhao, Meng Ni, Hong Zhao,
Published: 11 October 2021
Advanced Materials Interfaces; https://doi.org/10.1002/admi.202101256

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Published: 11 October 2021
Advanced Materials Interfaces; https://doi.org/10.1002/admi.202101083

Abstract:
The layer-by-layer surface modification of open cell foams is a recently developed route to reduce the fire threat of this class of materials. This approach generally requires a high number of deposition steps to achieve the desired properties. This paper reports the water-based single-step deposition of efficient flame retardant coatings encompassing graphene oxide (GO) and DNA. During the deposition, a temperature-induced in situ assembly of the GO+DNA produces a continuous and thermally robust protective layer on the structure of the polyurethane (PU) foam where GO nanoplates are held together by DNA acting as a ligand. This GO+DNA coating can effectively prevent flame spread during flammability tests performed in horizontal or vertical configuration while considerably reducing the rate of combustion and production of smoke by cone calorimetry (−75% and 30% in peak of heat release rate and total smoke release, respectively). The DNA promotes the formation of a protective structure that efficiently limits heat and volatiles transfer from and to the flame thus resulting in flame retardant (FR) performances capable of outperforming many of the FR coatings developed so far for PU foams. The proposed approach potentially opens up to the development of high performing FR solutions based on graphene-related materials and bio-based components.
Published: 11 October 2021
Advanced Materials Interfaces; https://doi.org/10.1002/admi.202101375

Abstract:
The diffraction of polychromatic light from periodic superficial structures is often responsible for the structural colors observed in Nature. Similarly, engineered microtextures fabricated on metallic or dielectric surfaces can be used to design diffracted optical patterns with desired shapes and colors. To this aim, advanced diffraction gratings with exceptional design and functionality are continuously proposed, and new fabrication methods follow to stay abreast with the improving design capabilities. Multiplexed surface reliefs, acting as complex gratings with tunable diffraction behavior, can be readily produced on films of azobenzene containing materials by exposing the surface to controlled sequences of holographic interference patterns. This work fully investigates, both theoretically and experimentally, the use of light-induced surface relief on azopolymers for the realization of large-scale multiplexed gratings with optimized diffraction performances. The reconfigurable diffraction gratings able to diffract polychromatic light in the same direction with controllable relative color intensities by tuning exposure parameters in a switchable two-beam interference setup are designed and fabricated. The results can be generalized to more complex diffractive devices, usable in emerging display application areas.
Emanuela Schilirò, , Salvatore E. Panasci, Simonpietro Agnello, Marco Cannas, Franco M. Gelardi, Fabrizio Roccaforte,
Published: 11 October 2021
Advanced Materials Interfaces; https://doi.org/10.1002/admi.202101117

Abstract:
In this paper, the authors demonstrate the atomic layer deposition (ALD) of highly homogeneous and ultrathin (≈3.6 nm) Al2O3 films with very good insulating properties (breakdown field of ≈10–12 MV cm−1) directly onto monolayer (1L) MoS2 exfoliated on gold. Differently than in the case of 1L MoS2 supported by a common insulating substrate (Al2O3/Si), a better nucleation process of the high-k film is observed on the 1L MoS2/Au system since the ALD early stages. Atomic force microscopy analyses show a ≈50% Al2O3 surface coverage just after 10 ALD cycles, its increase to >90% (after 40 cycles), and a uniform ≈3.6 nm film (after 80 cycles). The Al2O3 density on bilayer MoS2 is found to be significantly reduced with respect to 1L MoS2/Au, suggesting a role of screened interface charges with the metal substrate on the adsorption of ALD precursors. Finally, Raman and photoluminescence spectroscopy show a p-type doping and tensile strain of 1L MoS2 induced by the Au substrate, providing an insight on the evolution of vibrational and optical properties after the Al2O3 deposition. The direct ALD growth of Al2O3 on large-area 1L MoS2 induced by the Au underlayer can be of wide interest for electronic applications.
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