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学者姓名：杨森
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Abstract ：
In nature, many organisms (e.g., chameleons) protect themselves by changing their colors in response to environmental changes. Inspired by these organisms, we present a multi-responsive, flexible, and structurally colored hydrogel film with a one-dimensional (1D) ordered periodic groove structure. The groove structure endows the filmwith bright, highly angle-dependent structural colors, which can be reversibly tuned by stretching and releasing. In addition, because of the thermosensitive properties of the hydrogel, the film can be switched between colored state and opaque white state with temperature. In addition, the optical state of the film is sensitive to solvent and can be reversibly changed between colored state and transparent state with soaking and evaporation of the solvent. This reversible, multi-responsive, flexible, and structurally colored hydrogel film has great potential to be used in the fields of color display, sensors, anti-counterfeiting, and so on because of its flexible and diverse tuningmethods, excellent optical performance, and convenient preparation process.
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| GB/T 7714 | Wen, Xiaoxiang , Lu, Xuegang , Li, Jianing et al. Multi-responsive, flexible, and structurally colored film based on a 1D diffraction grating structure [J]. | ISCIENCE , 2022 , 25 (4) . |
| MLA | Wen, Xiaoxiang et al. "Multi-responsive, flexible, and structurally colored film based on a 1D diffraction grating structure" . | ISCIENCE 25 . 4 (2022) . |
| APA | Wen, Xiaoxiang , Lu, Xuegang , Li, Jianing , Wei, Chaoping , Qin, Hongji , Liu, Yuting et al. Multi-responsive, flexible, and structurally colored film based on a 1D diffraction grating structure . | ISCIENCE , 2022 , 25 (4) . |
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Abstract ：
The charge density wave (CDW) states of two-dimensional transition metal dichalcogenides (TMDs) originate from intrinsic couplings between the electronic structures and lattice distortion, inducing interesting physical and chemical properties. The observed TMDs CDW states are mostly nonmagnetic (NM) but with a few ferromagnetic (FM) cases. Physical mechanisms for the formation of FM CDW remain elusive. In this paper, we used density functional theory calculations to study a set of TMDs with magnetic transition metal elements (e.g., V, Cr, and Mn). We found that the FM state can stem from the direct exchange to superexchange transition (e.g., CrX2) or the M-M (M is the metal atom) dimerization (e.g., MnX2). A crystal structure distortion index is proposed to distinguish the different formation mechanisms of FM CDW states. Interestingly, CrX2 has both NM and FM CDW states, which is not observed in other TMDs materials. We found that charge (electron or hole) doping could modulate the different formation mechanisms and induce a phase transition between these two CDW states in CrS2, leading to significant actuation strain output (i.e., 12.17% and 5.93% along x and y directions, respectively) and drastic change of magnetism, which could enable some multifunctionality applications of TMD materials.
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| GB/T 7714 | Chen, Kaiyun , Deng, Junkai , Kan, Dongxiao et al. Ferromagnetic and nonmagnetic 1T ' charge density wave states in transition metal dichalcogenides: Physical mechanisms and charge doping induced reversible transition [J]. | PHYSICAL REVIEW B , 2022 , 105 (2) . |
| MLA | Chen, Kaiyun et al. "Ferromagnetic and nonmagnetic 1T ' charge density wave states in transition metal dichalcogenides: Physical mechanisms and charge doping induced reversible transition" . | PHYSICAL REVIEW B 105 . 2 (2022) . |
| APA | Chen, Kaiyun , Deng, Junkai , Kan, Dongxiao , Yan, Yuan , Shi, Qian , Huo, Wangtu et al. Ferromagnetic and nonmagnetic 1T ' charge density wave states in transition metal dichalcogenides: Physical mechanisms and charge doping induced reversible transition . | PHYSICAL REVIEW B , 2022 , 105 (2) . |
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Abstract ：
Structural colors derived from nature have attracted extensive interest due to their unique optical performances and various applications in the field of biomimetic optics. Many organisms have evolved different strategies to respond to external stimuli, so as to obtain attention or hide themselves by changing their surface color. Inspired by this, various biomimetic micro/nanostructures with periodic size have been developed and realized tunable structural colors. Functional materials utilizing the synergy of thermal polymer and photonic microstructure to realize the temperature-responsive structural colors have broad application prospects in the fields of sensor, display, anti-counterfeiting and biomedical treatments, etc. In this review, the research progress on photonic crystals or other mechanisms for generating structural colors with various thermo-sensitive polymers is systematically summarized. The artificial systems with diverse types of temperature-stimulated reactions are presented. Finally, emerging research directions and current challenges in this field are also discussed.
Keyword ：
Color-changing Photonic materials Shape-memory Structural colors Thermo-responsive
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| GB/T 7714 | Wei, Chaoping , Lu, Xuegang , Wen, Xiaoxiang et al. Thermo-responsive color-changeable photonic materials: A review [J]. | OPTICS AND LASER TECHNOLOGY , 2022 , 152 . |
| MLA | Wei, Chaoping et al. "Thermo-responsive color-changeable photonic materials: A review" . | OPTICS AND LASER TECHNOLOGY 152 (2022) . |
| APA | Wei, Chaoping , Lu, Xuegang , Wen, Xiaoxiang , Liu, Yuting , Yang, Sen . Thermo-responsive color-changeable photonic materials: A review . | OPTICS AND LASER TECHNOLOGY , 2022 , 152 . |
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Abstract ：
Ferroelectric materials at morphotropic phase boundary (MPB) exhibit large piezoelectric coefficients and thus are widely used as piezoelectric actuators and sensors. Three different phase diagram topologies have been reported in various ferroelectric MPB systems: one with a cubic(C)-tetragonal(T)-orthorhombic(O)-rhombohedral(R) quadruple point; another with a C-T-R triple point and the other with a C-T-R along with a T-O-R triple point. However, it is unclear which phase diagram topology would give the best piezoelectric property. Here in this work, we obtain the above three different MPB phase diagram topologies by Landau free energy. It was found that among the three phase diagram topologies, the one with a T-O-R triple point exhibits superior piezoelectric property at the T-O-R triple point because of the small polarization anisotropy required by the simultaneous thermodynamic equilibrium of three ferroelectric phases. This work could guide the design of piezoelectric materials.
Keyword ：
ferroelectricity Morphotropic phase boundary phase diagram piezoelectricity
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| GB/T 7714 | Tian, Ben , Ke, Xiaoqin , Hong, Zhengkai et al. Topology of ferroelectric phase diagrams with morphotropic phase boundary and their piezoelectric properties [J]. | PHASE TRANSITIONS , 2022 , 95 (3) : 193-201 . |
| MLA | Tian, Ben et al. "Topology of ferroelectric phase diagrams with morphotropic phase boundary and their piezoelectric properties" . | PHASE TRANSITIONS 95 . 3 (2022) : 193-201 . |
| APA | Tian, Ben , Ke, Xiaoqin , Hong, Zhengkai , Chen, Zhang , Zhou, Chao , Wang, Yu et al. Topology of ferroelectric phase diagrams with morphotropic phase boundary and their piezoelectric properties . | PHASE TRANSITIONS , 2022 , 95 (3) , 193-201 . |
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Abstract ：
Monolayer two-dimensional transition metal dichalcogenides (TMDs) with direct band gaps, such as MoS2, have received great attention from researchers due to their peculiar band structure and physical properties. However, their extremely small thickness (0.65 nm for MoS2) results in a critically low light absorption efficiency, thus limiting their optoelectronic applications. To achieve the enhancement of the light-matter interaction in MoS2, a resonant Al/AAO (anodic alumina oxide template)/MoS2 trilayer nanocavity structure was designed and implemented in the present study. In such a system, the appropriate change in pore size and pore depth of the AAO template via control of the growth conditions allows one to adjust the thickness and refractive index of the dielectric layer (AAO). This nanocavity structure provides a possible way to regulate the light-matter interaction of MoS2 film.
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| GB/T 7714 | Deng, Chenhua , Kang, Kaifei , Yu, Zhonghai et al. Enhanced photoresponse of a MoS2 monolayer using an AAO template [J]. | RSC ADVANCES , 2021 , 11 (54) : 34410-34415 . |
| MLA | Deng, Chenhua et al. "Enhanced photoresponse of a MoS2 monolayer using an AAO template" . | RSC ADVANCES 11 . 54 (2021) : 34410-34415 . |
| APA | Deng, Chenhua , Kang, Kaifei , Yu, Zhonghai , Zhou, Chao , Yang, Sen . Enhanced photoresponse of a MoS2 monolayer using an AAO template . | RSC ADVANCES , 2021 , 11 (54) , 34410-34415 . |
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Abstract ：
Bright structural colors with an angular-independent character are in increasing demand in many fields such as pigments, buildings, sensors, color displays, and anti-counterfeiting labels. However, the structural colors produced by amorphous colloidal assemblies with low refractive index contrast or without black additives often exhibit low color visibility and low liquid-bleaching resistibility. Herein, large-scale and angle-independent structural colors were constructed from Fe3O4@SiO2 colloidal quasi-amorphous arrays (QAAs) prepared through a rapid "spraying" process. Due to the high-refractive-index and intrinsic black nature of Fe3O4, the coatings exhibit high brightness of structural colors even on white substrates under ambient lighting conditions. Moreover, as-obtained structural colors possess the ability of antiliquid bleaching and solvent-responsiveness. More importantly, flexible Fe3O4@SiO2/PDMS photonic paper can be fabricated by permeation of PDMS into the voids of Fe3O4@SiO2 colloidal QAAs. This QAAs-based photonic paper shows the ability to infuse silicone oils into its structure, locally swelling it and changing the reflected color. In turn, the resulting colored patterns can be easily erased by applying ethanol or low molecular weight silicone oils. The as-prepared photonic paper exhibits excellent durability and is rewritable at least 50 times without any significant changes in performance. Compared with the traditional long-range ordered photonic crystals, the rapidly prepared QAAs-based photonic coatings have unique advantages in the applications of permanents, color coatings, color printing, liquid colorimetric sensors, rewritable photonic paper, etc. because of the good structural color performance and are suitable for rapid and large-area preparation.
Keyword ：
anti-liquid bleaching high-refractive-index quasi-amorphous structures rewritable photonic paper solvent-responsiveness structural color
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| GB/T 7714 | Wen, Xiaoxiang , Lu, Xuegang , Wei, Chaoping et al. Bright, Angle-Independent, Solvent-Responsive, and Structurally Colored Coatings and Rewritable Photonic Paper Based on High-Refractive-Index Colloidal Quasi-Amorphous Arrays [J]. | ACS APPLIED NANO MATERIALS , 2021 , 4 (9) : 9855-9865 . |
| MLA | Wen, Xiaoxiang et al. "Bright, Angle-Independent, Solvent-Responsive, and Structurally Colored Coatings and Rewritable Photonic Paper Based on High-Refractive-Index Colloidal Quasi-Amorphous Arrays" . | ACS APPLIED NANO MATERIALS 4 . 9 (2021) : 9855-9865 . |
| APA | Wen, Xiaoxiang , Lu, Xuegang , Wei, Chaoping , Li, Jianing , Li, Yanlin , Yang, Sen . Bright, Angle-Independent, Solvent-Responsive, and Structurally Colored Coatings and Rewritable Photonic Paper Based on High-Refractive-Index Colloidal Quasi-Amorphous Arrays . | ACS APPLIED NANO MATERIALS , 2021 , 4 (9) , 9855-9865 . |
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Abstract ：
Fluorescence detection is actually available on measuring substances by using metal-based micro or nano structures which produce a great surface enhanced fluorescence (SEF) effect in quick response to endless diseases and environmental problems recently. However, traditional SEF substrates are expensive, as well as inefficient due to single-component detection mode. Therefore, SEF substrates with controllable fluorescence enhancement formed by magnetically responsive CoFe2O4@SiO2@Ag colloidal photonic crystals were designed in this work. The fluorescence spectra were enhanced selectively at different wavelength owing to photonic band gap adjusted by magnetic field so as to detect Rhodamine B (RB) and fluorescein isothiocyanate (FITC) which had quite different fluorescence emission wavelength. As-prepared composites showed that the highest enhancement factors were 12.6 and 17.6 fold for RB and FITC, respectively, only when the tunable photonic band gap matched with the fluorescence emission wavelength of fluorescent molecules. The mechanism of significant fluorescence enhancement was explained in detail. The CoFe2O4@SiO2@Ag substrates were confirmed to be reliable, sensitive and reproducible in detecting a variety of fluorescent molecules. The results played an important role in effective fluorescence detection, such as chemical analysis, biological sensing and cell imaging.
Keyword ：
Colloidal photonic crystals Fluorescence emission Magnetically responsive Photonic band gap Surface enhanced fluorescence
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| GB/T 7714 | Li, Yanlin , Lu, Xuegang , Yang, Sen . Preparation and properties of silver-deposited magnetically responsive colloidal photonic crystals for significant fluorescence enhancement [J]. | OPTICAL MATERIALS , 2021 , 122 . |
| MLA | Li, Yanlin et al. "Preparation and properties of silver-deposited magnetically responsive colloidal photonic crystals for significant fluorescence enhancement" . | OPTICAL MATERIALS 122 (2021) . |
| APA | Li, Yanlin , Lu, Xuegang , Yang, Sen . Preparation and properties of silver-deposited magnetically responsive colloidal photonic crystals for significant fluorescence enhancement . | OPTICAL MATERIALS , 2021 , 122 . |
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Abstract ：
A giant exchange bias (EB) of 9600 Oe was observed in polycrystalline Fe3O4/CoO layers at 10 K after 20 kOe field cooling, and was attributed to the strong exchange coupling formed by the interfacial spins between the polycrystalline Fe3O4and the CoO layer. It was found that at 10 K, the magnetic-moment difference (ΔM) between the zero field cooling curves and field cooling curves first increases and then decreases with the change of the field, and it reaches the maximum value at a field of 20 kOe, which suggests that the interfacial spins can be tuned by the cooling field. Furthermore, other magnetic properties, including field dependence, temperature dependence, and training effects, were investigated, which further confirmed that the interfacial spins play an important role in the EB effect. This work provides a method to tune the magnitude of the EB effect and reveals the mechanism of the dependency of EB on interfacial spins, which could guide the design of giant-EB-effect materials. © the Owner Societies 2021.
Keyword ：
Cobalt compounds Cooling Iron oxides Magnetic field effects Magnetic moments Magnetite Phase diagrams Temperature distribution
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| GB/T 7714 | Tian, Fanghua , Li, Yebei , Zhao, Qizhong et al. Giant exchange bias inducedviatuning interfacial spins in polycrystalline Fe3O4/CoO bilayers [J]. | Physical Chemistry Chemical Physics , 2021 , 23 (8) : 4805-4810 . |
| MLA | Tian, Fanghua et al. "Giant exchange bias inducedviatuning interfacial spins in polycrystalline Fe3O4/CoO bilayers" . | Physical Chemistry Chemical Physics 23 . 8 (2021) : 4805-4810 . |
| APA | Tian, Fanghua , Li, Yebei , Zhao, Qizhong , Cao, Kaiyan , Wang, Dingchen , Dai, Zhiyong et al. Giant exchange bias inducedviatuning interfacial spins in polycrystalline Fe3O4/CoO bilayers . | Physical Chemistry Chemical Physics , 2021 , 23 (8) , 4805-4810 . |
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Abstract ：
Many properties of materials exhibit a heavy dependency on the domain/grain size due to the change in interface density. Here, we show that in bulk Ni2Mn1+xGa1-x alloys (0.4 © 2021 Author(s).
Keyword ：
Cluster analysis Ferroelectric ceramics Ferromagnetic materials Ferromagnetism Frequency modulation Gallium alloys Glass Manganese alloys Permittivity Spin glass Ternary alloys
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| GB/T 7714 | Tian, Fanghua , Ke, Xiaoqin , Cao, Kaiyan et al. Tailoring exchange bias in reentrant spin glass by ferromagnetic cluster size engineering [J]. | APL Materials , 2021 , 9 (1) . |
| MLA | Tian, Fanghua et al. "Tailoring exchange bias in reentrant spin glass by ferromagnetic cluster size engineering" . | APL Materials 9 . 1 (2021) . |
| APA | Tian, Fanghua , Ke, Xiaoqin , Cao, Kaiyan , Wang, Dingchen , Zhao, Qizhong , Li, Jianing et al. Tailoring exchange bias in reentrant spin glass by ferromagnetic cluster size engineering . | APL Materials , 2021 , 9 (1) . |
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Abstract ：
Large effective flexoelectric coefficients have been experimentally obtained near the Curie temperature of many ferroelectric materials, which could greatly accelerate applications of flexoelectricity on actuators and sensors. However, it is still unclear why ferroelectric materials exhibit largest flexoelectric coefficient near their Curie temperatures. Here we employ a modified phenomenological Landau theory to estimate the intrinsic flexoelectric coefficient of BaTiO3 near Curie temperature. It is found that the intrinsic flexoelectric coefficients is largest and reach 1.3 μC/m at TC of its paraelectric phase. The large intrinsic flexoelectric coefficient of paraelectric BaTiO3 is found to correlate with the strong lattice instability of paraelectric phase near TC. This work could help unravel the origin of the large flexoelectric coefficients near TC of ferroelectric materials and would stimulate new research interest into designing ferroelectric materials with high flexoelectric coefficients utilizing phase transitions. © 2020 Elsevier Ltd and Techna Group S.r.l.
Keyword ：
Barium titanate Curie temperature Ferroelectricity Ferroelectric materials
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| GB/T 7714 | Ke, Xiaoqin , Deng, Qian , Yang, Sen . Origin of large intrinsic flexoelectric coefficients near curie temperature of BaTiO3 [J]. | Ceramics International , 2021 , 47 (3) : 4310-4314 . |
| MLA | Ke, Xiaoqin et al. "Origin of large intrinsic flexoelectric coefficients near curie temperature of BaTiO3" . | Ceramics International 47 . 3 (2021) : 4310-4314 . |
| APA | Ke, Xiaoqin , Deng, Qian , Yang, Sen . Origin of large intrinsic flexoelectric coefficients near curie temperature of BaTiO3 . | Ceramics International , 2021 , 47 (3) , 4310-4314 . |
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