ACS Applied Nano Materials
·
2023
·
IF 5.9
Yanchao Yu,Yuan Gao,Wenjuan Wang,Hanyang Chen,Yuzhe Yun,Seeram Ramakrishna,Jun Zhang,Yun-Ze Long
Traditional detection methods usually use a spectrometer, which requires a professional tester to operate and is not convenient to carry around. Herein, we designed a 5G smartphone-based portable test sensor that uses a CsPbBr3 composite fibrous membrane prepared by a one-step in situ growth method as the test paper, and the test is realized by taking pictures with the smartphone. This portable detection method requires only one drop of liquid to be detected (<25 μL), which is superior to many detection systems that require a large amount of liquid to be detected (>1 mL). Moreover, the detection sensitivity can reach 0.1 ppm, which is more sensitive than the CsPbBr3 composite fiber membrane prepared by the conventional encapsulated method. In addition, this CsPbBr3 composite fiber membrane is reusable and can still achieve highly sensitive detection with a single drop after 100 uses. This smartphone-based portable test sensor is small in size and easy to use and can be used at home or outdoors anytime and anywhere.
研究领域:
材料科学
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分析化学
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生物医学工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zelai Cheng,Liming Xu,Xi Wang,Xiaohui Wu,Fangyi Huang,Yulan Jing,Hua Su
Gillespite-type SrCu 0.95 B 0.05 (B 2+ :Cu,Co,Mn,Ni,Mg,Zn)Si 4 O 10 (SCBS) ceramics were prepared by high-temperature solid-state method. Their microwave dielectric properties and crystal structure evolution were studied by P–V-L theory, bond valence model, and X-ray photoelectron spectroscopy. Varying B 2+ ion changed ionic polarizability and bond ionicity, causing dielectric constant ε r of SCBS to change. The change in quality factor Q × f was explained by lattice energy, oxidation state of Cu, and internal strain/fluctuation. The temperature coefficient of resonator frequency τ f was regulated by B–O bond length and valence. The optimal microwave dielectric properties were exhibited by SrCu 0.95 Mn 0.05 Si 4 O 10 after sintering at 1050 °C: ε r ∼5.8 ± 0.03, Q × f ∼65,589 ± 2611 GHz (@15.8 GHz), and τ f ∼ -50 ± 4 ppm/°C. These materials show great potential application prospects for 5G/6G wireless communication.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Liu Peijiang,Sun Zhaoning,Wu Jianyu,Liu Jiahao,Shen Jianghua,Yang Xiaofeng,Ma Bingxu,Tian Wanchun,Peng Jianping,Huang Zhenkai
Liquid crystal polymer (LCP) has emerged as promising solution for 5G communication applications owing to its exceptional properties and suitability for high-frequency applications. To ensure sustained reliability in the face of harsh operating conditions, extensive research on aging mechanisms and strategies to mitigate aging-induced quality challenges associated with LCP materials is essential. In this context, LCP films were successfully synthesized through a standard blow-molding technique, followed by a comprehensive study of their aging behavior and mechanisms under humidity and heat conditions. The results of the study indicated that the LCP film maintained a high level of resistance to humid-heat conditions at specific temperature (85 °C) and humidity levels (85% RH). Specifically, only the dissipation factor (Df) values exhibited a slight increase with prolonged aging duration, while other properties such as tensile property, thermal behavior, color change, and water absorption remained unchanged. Specific fluorescence recognition revealed the possible aging mechanism owing to its high sensitivity. At the early aging stage, a small level of hydrothermal degradation occurred. As aging advances, the LCP polymer chains exhibited increased orderliness and compactness, resulting in a significant reduction in the hydrolysis rate. These findings provide valuable insights for guiding the long-term utilization of LCP films under humidity and heat conditions. Graphical abstract A kind of 5G communication used liquid crystal polymer and comprehensively investigated its aging behavior, mechanism, and service lifetime under long-term humidity and heat Conditions.
研究领域:
材料科学
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高分子化学
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电子材料
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通信工程
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可靠性工程
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产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2023
·Vol. 8
·期 10
·2201985
·
IF 6.8
Chao Du,Xiang-Kun Li,Di Zhou,Shao-Fei Wang,Rui-Tao Li,Xiao-Gang Yao,Hui-Xing Lin,Hai-Yi Peng,Tao Zhou,Shi-Kuan Sun,Song Xia,Zhuo Xu
Array antenna is of great significance in realizing the Sub-6 GHz fifth-generation (5G) mobile communication systems, however, its utilization in the base station systems implementation is limited due to high power consumption. In this paper, a high radiation efficiency 4 × 4 cylindrical dielectric resonator antenna (CDRA) array fabricated using the temperature stable 0.8Zn 2 SiO 4 -0.2TiO 2 composite ceramic is proposed. TiO 2 -doped Zn 2 SiO 4 composite ceramics are synthesized by the conventional solid-state method. Notably, 0.8Zn 2 SiO 4 -0.2TiO 2 composite ceramic sintered at 1250 °C demonstrates excellent microwave dielectric properties with dielectric constant (ε r ≈ 8.24), high-quality factor ( Q × f ≈ 35 000@8.08GHz), and the temperature coefficient of resonant frequency ( TCF ≈ +4.6 ppm °C −1 ). Moreover, the composite ceramic CDRA array is designed by exciting fundamental HE 11δ mode using the aperture coupling microstrip feeding network. The fabricated composite ceramic based 4 × 4 CDRA array has enhanced measured radiation efficiency of up to 87%, high gain of 17.85 dBi and is a promising candidate for utilization in Sub-6 GHz 5G Base Station communications systems.
研究领域:
通信工程
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
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IF 5.7
Juan Liu,Bing Liu,Cheng Chao Hu,Qing Wei Zhou,Kai Xin Song
(1– x )BaV 2 O 6 - x LiF ( x = 0.025, 0.05, 0.10, 0.15) ceramics with an ultra-low sintering temperature of 475 °C were synthesized using the standard solid-state reaction method. The ceramics demonstrated a remarkable enhancement in the quality factor ( Qf ), reaching a maximum value of 16,800 GHz at x = 0.10, which is 5.6 times higher than that of pure BaV 2 O 6 ceramics obtained in this work. A near-zero temperature coefficient of resonant frequency ( τ f = 1.44 ppm/°C) was simultaneously achieved, together with a dielectric constant ε r of 11.54. Additionally, the chemical compatibility between the present ceramics and the Al electrode was confirmed. Moreover, a millimeter-wave antenna with an excellent S 11 value of −50.3 dB, and a large bandwidth of 3.44 GHz was fabricated using the 0.9BaV 2 O 6 -0.1LiF ceramic as the dielectric resonator . These results highlight the potential application prospects of (1– x )BaV 2 O 6 - x LiF ceramics in the ultra-low temperature co-fired ceramic technology and 5 G millimeter-wave antennas.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Yang Pan,Bin Yang,Ning Jia,Yangnan Yu,Xiang Xu,Yingying Wang,Ru Xia,Jiasheng Qian,Chenjun Wang,Aiqing Sun,You Shi,Yirong Fang
In this work, Ni@GNP nanohybrids fabricated via an in situ reduction method were incorporated into polymethyl methacrylate (PMMA) to prepare PMMA/Ni@GNP nanocomposites via solution blending and hot-pressing. The Ni nanoparticles with an average diameter of 70–80 nm were observed to successfully grow on the GNP surface via SEM and TEM. Both thermally conductive and microwave absorbing properties of the prepared composites were intensively investigated. A reflection loss test experimentally suggested that the PMMA/Ni@GNP composites showed a good microwave absorbing property, among which the composite containing 30 wt % Ni@GNP displayed the best microwave absorption performance (with a value of −30 dB for RLmin in the C band). The thermal conduction behavior of the composites was jointly studied by infrared thermal imaging (ITI) and enthalpy transformation method together with a four-parameter model. The average heating rate during an initial stage was obviously found to increase from 65.4 to 103.2 °C/min, indicating that a well-defined heat conduction network gradually formed in the composites, which exerted positive influence on heat conduction. The composites generally bore perfect thermal conductivities (e.g., with a maximum in-plane thermal conductivity of 9.02 W/m·K and a maximum out-of-plane value of 1.29 W/m·K), and the variations of thermal conductivity versus filler loading should be attributed to the construction of an anisotropically thermally conductive network in the composites. The PMMA/Ni@GNP composites with desirable microwave absorption and thermal conductivity would find potential applications in 5G communication devices.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Ya-Qi Wang,Qing He,Zhi-Yang Zhang,Lei Zhang,Na-Juan Yuan,Yong Liu,Hai-Tao Ren,Xu Han
Although the low molecular weight poly(2,6-dimethyl-1,4-phenyl oxide) (LMW-PPO) has been extensively applied in the field of 5G communication, the complicated procedures involved in the synthesis of LMW-PPO and efficient recovery of the homogeneous catalysts are still challenging nowadays. In this study, five ionic liquids (ILs) have been successfully synthesized, and LWM-PPO is directly synthesized using different Cu(OAc) 2 -ILs complexes as catalysts. Among them, Cu(OAc) 2 - IL(a) not only exhibits the high yield of LWM-PPO (83.68%, M n =3.6✕10 3 ) with the low 3,3’,5,5’-tetramethyl-4,4’-diphenoquinone (DPQ) yield (0.12%) and polydispersity index (PDI, 1.39) in methanol, but also maintains high stability after being recycled for 5 times. In addition, with increasing H 2 O contents in the system from 1.0% to 5.0%, the M n values of PPO decrease from 2.9✕10 3 to 2.4✕10 3 with the narrow PDI values in the range of 1.22-1.45, indicating that trace H 2 O effectively promotes the formation of binuclear Cu(II) complex between Cu(OAc) 2 ·H 2 O and ILs, which then polymerizes 2,6-dimethylphenol (DMP) to LMW-PPO. The synthesized LMW-PPO exhibits high thermostability ( T d5% =427.07-430.52°C), low glass transition temperature ( T g =167.6-180.3°C), and low dielectric constant ( D k =2.14-2.64, 1 GHz) and dielectric loss ( D f =2.83✕10 -3 -4.91✕10 -3 , 1 GHZ), indicating that it is more appropriate to be used in the field of 5G communication. This study provides new insight on the importance of ILs in direct synthesis of LMW-PPO with high performances.
研究领域:
材料科学
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化学工程
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高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiaohui Wu,Yulan Jing,Yuanxun Li,Hua Su
The comprehensive properties and sintering temperature of microwave dielectric ceramics are the key factors limiting their practical application. In this work, a novel strategy of complex (Co 1/3 Nb 2/3 ) 4+ ions substituted and adding glass (Li 2 O-B 2 O 3 - SiO 2 -CaO-Al 2 O 3 : LBSCA) was proposed to greatly enhance the microwave dielectric properties of Ba 3 Ti 4- x (Co 1/3 Nb 2/3 ) x Nb 4 O 21 (0 ≤ x ≤ 12 mol%, x CN-BTN) ceramics. A new ceramic of (Co 1/3 Nb 2/3 ) 4+ substitution improved hexagonal phase BTN was successfully fabricated and systematically investigated. As the increased of (Co 1/3 Nb 2/3 ) 4+ ions concentration, the Q× f was greatly increased because of higher packing fraction, and the reduction in the [Nb1/Ti1O 6 ] octahedral distortion caused great changes of τ f . Besides, the P-V-L theory revealed that the Ti/Nb ratio greatly contributed in permittivity ε r , and the Nb-O bonds mainly affected dielectric loss, especially in Nb(1)-O2(1) bond. As a result, the superior microwave dielectric properties were obtained in 6CN-BTN ceramic sintered at 950 °C: ε r ∼40.99 ± 0.48, Q× f ∼17,310 ± 565 GHz, and τ f ∼8.62 ± 4.34 ppm/°C. More encouragingly, 6CN-BTN showed good compatibility with silver, making it a promising K 40 LTCC material for filter and dielectric resonators . This study presented a new strategy to improve the properties of BTN-based materials by complex ions substitution, which was expected to provide a general approach for the design of advanced microwave dielectric ceramics for other material systems.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
DESIGNED MONOMERS AND POLYMERS
·
2023
·
IF 1.6
Xiaolong Liu,Yunlong Sun,Yue Chen,Zhongfu Zhao,Zhipeng Wang,Guangyuan Zhou
The high-frequency and high-speed communication in the 5 G era puts forward requirements for the dielectric properties of polymers. Introducing fluorine into poly(ary ether ketone) can improve its dielectric properties. In this work, by introducing the fluorine group strategy, we successfully designed and synthesized three novel trifluoromethyl (−CF3) or trifluoromethoxy (−OCF3)-containing bisphenol monomers and their F-substitution PEK-based polymers (PEK-Ins). All these PEK-Ins exhibited good thermal, mechanical and dielectric properties. The T d5% of the three polymers is all higher than 520℃. The free volume fraction of novel polymers increased from 3.75% to 5.72%. Among the three polymers, exhibited the lowest dielectric constant of the films is 2.839, and the dielectric loss is 0.0048, ascribing to the increasing free volume. The Young’s modulus of the polymer film is as high as 2.9 GPa and the tensile strength is as high as 84 MPa. PEK-Ins reduced the dielectric constant by introducing a low fluorine content. This study provides a new way to design PEK to synthesize low dielectric constant polymers.
研究领域:
材料科学
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高分子化学
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电气工程
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产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-8
·
IF 17.694
Li Ming-Ding,Shen Xiao-Quan,Chen Xin,Gan Jia-Ming,Wang Fang,Li Jian,Wang Xiao-Liang,Shen Qun-Dong
With speeding up development of 5 G chips, high-efficient thermal structure and precise management of tremendous heat becomes a substantial challenge to the power-hungry electronics. Here, we demonstrate an interpenetrating architecture of electrocaloric polymer with highly thermally conductive pathways that achieves a 240% increase in the electrocaloric performance and a 300% enhancement in the thermal conductivity of the polymer. A scaled-up version of the device prototype for a single heat spot cooling of 5 G chip is fabricated utilizing this electrocaloric composite and electromagnetic actuation. The continuous three-dimensional (3-D) thermal conductive network embedded in the polymer acts as nucleation sites of the ordered dipoles under applied electric field, efficiently collects thermal energy at the hot-spots arising from field-driven dipolar entropy change, and opens up the high-speed conduction path of phonons. The synergy of two components, thus, tackles the challenge of sluggish heat dissipation of the electroactive polymers and their contact interfaces with low thermal conductivity, and more importantly, significantly reduces the electric energy for switching the dipolar states during the electrocaloric cycles, and increases the manipulable entropy at the low fields. Such a feasible solution is inevitable to the precisely fixed-point thermal management of next-generation smart microelectronic devices.
研究领域:
材料科学
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电子工程
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热能工程
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纳米技术
✓ 已验证
DOI
PubMed
高影响因子
International Journal of Refrigeration
·
2025
·
IF 3.8
Shiya Lin,Yiqi Xie,Xianyang Chen,Pengcheng Lin,Ying Chen
Advanced cold chain systems are essential for maintaining nutritional integrity and reducing spoilage in perishable fruits. However, conventional mechanical refrigeration incurs considerable energy consumption and operational costs. This study introduces a green, safe, and cost-effective alternative—Brine Phase Change Cold Storage Gels (BPCCSGs). With a low phase change temperature (−11.29 °C), high latent heat (242.14 J·g⁻¹), and elevated thermal conductivity (0.835 W·m⁻¹·K⁻¹), BPCCSGs are well-suited for cold chain applications involving subtropical fruits. Additionally, the risk of cold storage material leakage and its consequent detriment to fruit safety could be significantly reduced by using our state-of-the-art gel packaging technique. Gel-based encapsulation effectively minimized leakage risk and prevented potential contamination. Pre-charging BPCCSGs during off-peak hours significantly improved energy and cost efficiency (3.82 × 10⁻⁵ $·J⁻¹), while reducing environmental burden. Moreover, the improvement in thermal conductivity and the optimization of the spatial layout facilitated temperature uniformity of BPCCSGs at cold storage scenarios. Finally, the integration of a 5G-enabled sensor system enabled real-time monitoring of temperatures and locations. The system was successfully deployed in waxberry logistics, ensuring real-time traceability and maintaining fruit quality, highlighting its potential for next-generation cold chain systems.
研究领域:
食品科学
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储能技术
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制冷技术
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供应链管理
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智慧农业
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 4
·629-640
·
IF 11.534
Guo Weijia,Ma Zhiyu,Luo Yu,Chen Yugu,Yue Zhenxing,Li Longtu
Low-loss tungsten-bronze microwave dielectric ceramics are dielectric materials with potential application value for miniaturized dielectric filters and antennas in the fifth-generation (5G) communication technology. In this work, a novel Al/Nd co-doping method of Ba 4 Nd 9.33 Ti 18 O 54 (BNT) ceramics with a chemical formula of Ba 4 Nd 9.33+ z /3 Ti 18− z Al z O 54 (BNT-AN, 0 ⩽ z ⩽ 2) was proposed to improve the dielectric properties through structural and defect modulation. Together with Al-doped ceramics (Ba 4 Nd 9.33 Ti 18− z Al 4 z /3 O 54 , BNT-A, 0 ⩽ z ⩽ 2) for comparison, the ceramics were prepared by a solid state method. It is found that Al/Nd co-doping method has a significant effect on improving the dielectric properties compared with Al doping. As the doping amount z increased, the relative dielectric constant ( ε r ) and the temperature coefficient of resonant frequency ( τ f ) of the ceramics decreased, and the Q×f values of the ceramics obviously increased when z ⩽ 1.5. Excellent microwave dielectric properties of ε r = 72.2, Q×f = 16,480 GHz, and τ f = +14.3 ppm/°C were achieved in BNT-AN ceramics with z = 1.25. Raman spectroscopy and thermally stimulated depolarization current (TSDC) technique were firstly combined to analyze the structures and defects in microwave dielectric ceramics. It is shown that the improvement on Q×f values was originated from the decrease in the strength of the A-site cation vibration and the concentration of oxygen vacancies ( \({\rm{V}}_{\rm{O}}^{ \cdot \cdot }\) ), demonstrating the effect and mechanism underlying for structural and defect modulation on the performance improvement of microwave dielectric ceramics.
研究领域:
材料科学
·
电气工程
·
陶瓷
·
微波技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）