CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Ruiwen Ji,Meng Lei,Cécile Genevois,Wenda Zhang,Xing Ming,Lunhua He,Mathieu Allix,Congling Yin,Xiaojun Kuang,Xianran Xing
Layered materials coupling a two-dimensional strong-bonding layered network with much weaker van der Waals (vdW) interaction between the layers are sought after for the development of nanoelectronics and energy conversion devices. It is important to elucidate the layer stacking rules in these vdW materials and control the thickness of the strong-bonding layers for tuning the nanosheet height during exfoliation and therefore tailor physical properties. Here, we show that the single Bi2O2Se ionic layer in the three-anion vdW semiconductor Bi4O4SeCl2 showing extremely low thermal conductivity can be expanded to higher-order layers forming a homologous series Bi2+2nO2+2nSenX2 (X = Cl, Br) with variable ionic layer thicknesses. Bi4O4SeX2 (n = 1) and Bi6O6Se2X2 (n = 2) were isolated as single-phase materials, while materials with larger layer thicknesses such as Bi8O8Se3Cl2 (n = 3) contain different defect-intergrowth structures at the crystallite scale. The anionic disorder of Se and X within the Bi2O2Se and Bi2O2X2 slabs is a critical factor in the stabilization of Bi2+2nO2+2nSenX2. The ∼50% Se substitution by X anions in the Bi2O2Se slab as related to the weak interlayer interaction can serve as a stabilization criterion of Bi2+2nO2+2nSenX2. All of these materials show similar optical indirect band gaps of ∼1.05 eV, originating from the electronic states in the Bi2O2Se slabs. Pellets prepared from these vdW materials possessed low bulk resistivities (100 Ω·cm) and exceptionally low and tunable thermal conductivities (0.66 W/mK and lower) parallel to the pressing axis of the pellets (heavier the halogen is, lower is the thermal conductivity). The results presented here provide important multiple anion chemistry for tailoring the ionic-bonding network into different thicknesses in the vdW layered structures and therefore their physical properties.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Results in Physics
·
2023
·
IF 5.3
Meijie Zhu,Hua Xu,Zuoquan Tan,Le Wang
Large-area and uniform two-dimensional (2D) non-layered α-MnSe was successfully synthesized via the molecular sieve modified chemical vapor deposition (CVD). The molecular sieve serves both as a filter and a container to controllable release the Mn precursor in a stable and much lower concentration, leading to the uniform growth of 2D α-MnSe flakes. The thickness, crystalline quality and uniformity of the as-grown α-MnSe are further characterized. Our study validated the positive role of molecular sieve in the controllable growth of 2D α-MnSe, which is believed to be applicable to other non-layered transition metal chalcogenides (TMCs) and will be beneficial for their further applications in electronics, optoelectronics and spintronics.
研究领域:
材料科学
·
纳米科技
·
凝聚态物理
·
无机化学
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 6
·2715-2723
·
IF 6.482
Xiaojing Feng,Zhongnan Guo,Xiaoxiao Yan,Jun Deng,Dan Wu,Zijing Zhang,Fan Sun,Wenxia Yuan
Metal phosphorus trichalcogenides (MPX3) are of great interest since these layered materials exhibit wide applications in optical, electrical and magnetic fields. An effective chemical intercalation route for MPX3 which could regulate their physical properties, however, is still lacking. In this work, we show that the liquid ammonia method is an efficient route to co-intercalate alkali metals and NH3 molecules into the gaps in FePS3. After intercalation, the interlayer distance is significantly enlarged by ∼3 Å while the monoclinic lattice (C2/m space group) is still maintained. The structure refinement and EDS measurement suggest that intercalation does not induce any Fe vacancy, thus leading to electron transfer from the alkali metal to [FePS3] layers. Interestingly, magnetic susceptibility shows that the intrinsic anti-ferromagnetic transition in the FePS3 matrix is completely suppressed by this intercalation, whereas a spin-glass state is observed in A(NH3)xFePS3 (A = Li, K) in the lower temperature range (<50 K). The intercalation described in this work is reversible: the alkali metal can be easily de-intercalated using a two-step route and the anti-ferromagnetism reappears accordingly. Meanwhile, the liquid ammonia method is also shown to be efficient at intercalating other MPS3 materials (M = Mn, Co, Ni). Our work not only enriches the intercalation chemistry in the MPX3 system but also provides an excellent route to regulate the magnetic properties of these layered materials.
研究领域:
材料科学
·
无机化学
·
凝聚态物理
·
纳米技术
·
功能材料
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Xinyu Fan,Yang Liu,Yongpeng Yang,Yunxiu Jia,Jingxin Yu,Fengniu Lu,Zhiqin Yuan,Chao Lu
The properties and applications of colloidal sol nanomaterials are largely affected by their crystallinity, making the rapid screening of colloidal sol crystallinity important to explore diverse advanced nanomaterials. Yet, the rational design of a novel technique for colloidal sol crystallinity analysis remains a great challenge. In this study, we synthesized an imidazole-anchored naphthalene diamine (IANA) fluorophore with a planar naphthalene motif. Using IANA as the fluorescence probe, we demonstrated the rapid and direct screening of colloidal sol crystallinity in model layered materials (cadmium–aluminum layered double hydroxides, CdAl-LDHs). The crystallinity-promoted fluorescence quenching is attributed to the crystallinity-enhanced ordered arrangement of IANA by Cd-imidazole coordination, which benefits its face-to-face π–π stacking and inhibits the absorption of ultraviolet light. Without drying treatment, this technique directly reveals the crystallinity information of colloidal sol CdAl-LDHs. In addition, the practical application of the proposed fluorescence technique is verified by accurate colloidal sol crystallinity determination of the CdAl-LDHs sample with unknown crystallinity. This work has opened a new avenue for exploring an alternative to X-ray diffraction for the rapid screening of the colloidal sol crystallinity of layered materials and even organic crystals through π–π stacking-regulated fluorescence.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2019
·Vol. 6
·期 8
·2308-2315
·
IF 3.975
Cai-ling Liu,Shao-hua Luo,Hong-bo Huang,Yu-chun Zhai,Zhao-wen Wang
Graphical Deficiency not insuffciency : Potassium-deficient layered P3-K 0.45 Mn 0.9 Mg 0.1 O 2 is prepared through a simple solid-state reaction and investigated as a cathode material for K-ion batteries. It exhibits excellent electrochemical performance. Novel, potassium-deficient, layered P3-K 0.45 Mn 0.9 Mg 0.1 O 2 is successfully prepared through a simple solid-state reaction method; its electrochemical performance as a cathode material for K-ion batteries is explored for the first time. The as-prepared K 0.45 Mn 0.9 Mg 0.1 O 2 delivers a high reversible capacity of 108 mAh g −1 at a current density of 20 mA g −1 in the potential region from 1.5 to 4.0 V. Moreover, the cyclability is enhanced by Mg substitution. After 100 cycles, the capacity of K 0.45 Mn 0.9 Mg 0.1 O 2 can remain at about 80.8 mAh g −1 at 20 mA g −1 . It also presents an excellent rate performance of 69.8 mAh g −1 even at a high current density of 200 mA g −1 . Furthermore, the potassium storage mechanism is studied by using the ex situ XRD technique. These results contribute to the development of rechargeable K-ion batteries based on earth-abundant elements.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Lingchao Pan,Yonggao Xia,Bao Qiu,Hu Zhao,Haocheng Guo,Kai Jia,Qingwen Gu,Zhaoping Liu
Migration of transition metal (TM) ions to tetrahedral sites plays a crucial role on structural transformation and electrochemical behaviors for Li-rich layered oxides . Here, incorporating small B 3+ in the tetrahedral interstice is employed to block the migration channel of TM ions and stabilize the crystal structure. Benefiting from their good structural stability, Li-rich layered materials with B-doped Li 1.198 Ni 0.129 Co 0.129 Mn 0.535 B 0.01 O 2 and Li 1.196 Ni 0.127 Co 0.127 Mn 0.529 B 0.02 O 2 , exhibit excellent cycling performance and voltage stability. After 51 cycles at 0.2 C, 1 mol.% boron incorporated sample can deliver 211 mAh g −1 with capacity retention of 89.9%, which is much higher than that of the undoped sample of 177 mAh g −1 with the retention of 79.2%. Moreover, the declined voltage per cycle decreases from 3.6885 mV to 2.7530 mV after 2 mol.% boron doping. XRD patterns after extended cycling verified the suppression of the structural transformation by the incorporation of boron.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2021
·
IF 3.115
Zhongying Ma,Dehai Meng,Zhihao Zhang,Yuhua Wang
A novel environment-friendly and efficient flame retardant (phytic acid [PA] - layered double hydroxide [LDH]) has been synthesized to enhance the flame retardancy of PVA. PA-LDH possesses better char formation ability with a high char residue of 68.7 wt% at 600 °C. Peak release rate (pHRR) and heat release capacity (HRC) values of PVA/PA-LDH15% are 180 W/g and 310 J/g-K, with the descent of 69.4% and 31.7%, respectively. The burning rate of PVA/PA-LDH decreased visibly, presented that higher fire retardancy can be obtained for PVA/PA-LDH. It is worth noting that PA-LDH could restrain the melt-dripping of PVA during the combustion process, which is of great significance in fire-spread control. Furthermore, the synergistic flame-retardant mechanism of phosphorus-contained PA and inorganic LDH is proposed based on microscopic analysis on char residues. In addition, PVA/PA-LDH composites exhibit good mechanical properties, the green flame retardant is of considerable significance to the flame-retardant treatment of polymers.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 16
·1705833
·
IF 13.325
Zhongjian Xie,Chenyang Xing,Weichun Huang,Taojian Fan,Zhongjun Li,Jinlai Zhao,Yuanjiang Xiang,Zhinan Guo,Jianqing Li,Zhigang Yang,Biqing Dong,Junle Qu,Dianyuan Fan,Han Zhang
Nonlayered materials are constructed with chemical covalent bonds in all three dimensions, distinct from layered materials, which contain evident structural differences in the horizontal and vertical directions. As a consequence, liquid-phase exfoliation (LPE), a widely explored technique to obtain 2D layered nanoarchitectures, has not yet been fully characterized for the realization of 2D nonlayered nanostructures. Herein, by virtue of a typical chain-like structure of crystalline bulk Te with strong Te Te covalent bonds in intrachains and weak Van der Waals forces in interchains, ultrathin 2D nonlayered Te nanosheets are realized by means of an LPE method. The resultant 2D Te nanosheets possess a broad lateral dimension ranging from 41.5 to 177.5 nm and a thickness ranging from 5.1 to 6.4 nm, and its photoresponse properties are evaluated using photoelectrochemical measurements. The 2D Te nanosheets exhibit excellent photoresponse behaviors from the UV to the visible regime in association with strong time and cycle stability for the on/off switching behaviors. The fabrication approach of 2D Te nanosheets would arouse interest in exfoliating other nonlayered 2D materials, which would expand the family of 2D materials.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yu Wang,Xianyou Wang,Ruizhi Yu,Xiaohui Zhang,Manfang Chen,Ke Tang,Yan Huang
Because of the high safety, abundant resource and low cost of sodium ion batteries (SIBs), lithium ion batteries (LIBs) will be replaced by SIBs with the ever-increasing market demand for high performance and low cost energy storage battery system. However, the short cycle life and poor rate performance for current SIBs restrict their further application. Cathode materials are the most important component for the development of SIBs, which have an unparalleled effect on enhancing the electrochemical performance of SIBs. Herein, a high electrochemical performance O3-type NaMn 2/3 Co 1/6 Ni 1/6 O 2 is synthesized by hydrothermal method and high-temperature annealing. The as-prepared sample shows the uniform spherical morphology and exhibits a specific capacity of 153.6 mAh g −1 with high capacity retention of 81.7% after 100 cycles and the coulombic efficiency of 98%. Moreover, the sample also exhibits excellent rate performance and the reversible capacity is 91.6 mAh g −1 at 1 C. The remarkably enhancing electrochemical performances make it be considered as a promising cathode active material of SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2018
·Vol. 8
·期 1
·1-11
·
IF 4.122
Zhang Xiaosheng,Niu Wenxing,Dai Yingjing,Xu Hong,Dong Jinxiang
Lubricating technologies are essential for saving energy and identifying effective, environmentally friendly layered materials that meet the demands of solid lubricants is an important direction. Herein, we probed the relationships between load-carrying capacity and crystal structure. The results showed that increasing the sliding resistance of interlayers using corrugated layers increased the load-carrying capacity of layered solid lubricants. This finding expands on the traditional lubrication mechanism of layered materials. Following the rules, rapid selection of layered potassium magnesium and calcium phosphates (K-LMP and K-LCP) as effective solid lubricants was achieved using crystallographic data and strict filtering criteria. In order to prepare materials suitable for lubrication, the synthesis of K-LMP and K-LCP was optimised. These materials could be utilised in the food, textile or marine machinery industries in the future. The developed method could successfully guide the synthesis of application-oriented materials.
研究领域:
材料科学
·
晶体学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Catalysis
·
2022
·
IF 13.7
Guoqiang Zhang,Jinyu Zhu,Yangsen Xu,Chen Yang,Chuanxin He,Peixin Zhang,Yongliang Li,Xiangzhong Ren,Hongwei Mi
Here, taking layered polymeric carbon nitride (CN) as an example, the dominant role of in-plane charge transport is demonstrated both theoretically and experimentally. The in-plane “sewing” and interlayer “cutting” effects of three alkaline potassium salts on the CN polymerization process are enhanced with the increase of alkalinity. The in-plane crystallinity-dependent charge transfer and separation and photocatalytic activity are elucidated through the samples of three alkaline potassium salt series. Our findings provide guidance for improving the photoelectric conversion efficiency by optimizing in-plane charge transfer rather than interlayer charge transfer, targeting layered photoelectric conversion materials.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Huanzhi Chen,Zongkui Tian,Xilong Zhou,Xiulian Fan,Zian Li,Cheng Li,Chenyang Niu,Wenlong Chu,Yuqi Zhou,Liqi He,Yumeng Yang,Zheng Peng,Yu Zhou
Large non-saturated magnetoresistances of semimetals are dominated by charge compensation due to their unique electronic structure. However, the dramatic magnetoresistance deteriorations are often observed in low-dimensional system resulting from high-density surface defects, where the suppression of charge scattering or concentration unbalance with highly maintained magnetoresistance is still challenging. Herein, a hydrogen annealing strategy is developed for surface defects passivation of 2D MoO 2 nanoflakes. Systematical characterization for H-MoO 2 nanoflakes reveals the formation of hydrogen chemical bonds that reduce surface defect density and slightly change Fermi level with unchanged bulk structures. An obviously enhanced magnetoresistance of 9.2% is demonstrated for H-MoO 2 nanoflakes compared to Ar-MoO 2 of 3.9% at 10 K and 9 T. The analysis of the nonlinearity Hall resistivity unravels the concentration of electrons and holes in H-MoO 2 approaches a more balanced equilibrium, which is attributed to surface defects passivation resulting in the suppression of self-doping effects for enhanced magnetoresistance rather than the reduced charge scattering with slightly enhanced carrier mobility. The research not only provides a universal surface passivation strategy on 2D nonlayered semimetals for approaching the charge compensation limit with the preserved magnetoresistance but also underscores the significance of surface passivation in tuning electronic structures of 2D nonlayered materials.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）