Journal of Materiomics
·
2024
·
IF 8.4
Jie Peng,Jie Jiang,Shuoguo Yuan,Pengfei Hou,Jinbin Wang
Ferroelectric materials are ideal for self-powered sensors in Internet of Things (IoT) and high-precision detection systems due to their excellent polarization properties. Compatibility with miniaturization, high-density systems, and complementary metal oxide semiconductor (CMOS) processes is crucial for their widespread adoption. HfO 2 -based ferroelectric films show potential in self-powered pyroelectric sensors as their thinness enables effective temperature and light detection. However, the disordered ferroelectric domain distribution limits their pyroelectric performance and hampers the development of highly integrated self-powered pyroelectric devices. This report investigates the temperature and light detection capabilities of Ce-doped HfO 2 ferroelectric films, which exhibit as-grown spontaneous polarization in the downward direction, making them a promising option for self-powered pyroelectric sensors. The findings provide robust evidence that the introduction of a temperature gradient significantly enhances pyroelectricity. In addition, their applications in the detection of hot/cold wind and breathing have been proved. Notably, the 30 nm thick Ce-doped HfO 2 ferroelectric film has a high pyroelectric coefficient of about 894.7 μC·m −2 ·K −1 and enables high-precision detection of changes in temperature of 0.1 K. This study highlights the potential application of HfO 2 -based ferroelectric films in self-powered sensors with temperature and light detection capabilities, making them a promising candidate for future IoT-based systems and high-precision detection systems.
研究领域:
材料科学
·
传感器技术
·
物联网
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DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 11
·期 2
·622-629
·
IF 8.067
Xiaozhang Chen,You Lv,Zhaobo Tian,Jingxi Yang,Yuan Zhu,Longxing Su
In this study, we developed an artificial synaptic device based on the HfO2 nanocrystals synthesized using a simple hydrothermal method. The metal–insulator–metal (MIM) structure device is designed and fabricated by combining a ceramic-like preparation technique and a standard electrode preparation method. The MIM device shows robust bipolar resistance switching characteristics with high endurance and long retention. High concentration hafnium vacancies are determined, and the formation/rupture of the conductive filament model is proposed to be responsible for the switching behavior between a high resistance state (HRS) and a low resistance state (LRS). In addition, the artificial synaptic device is simulated by applying an external pulse signal with different repetition rates and pulse widths, which exhibits synaptic functions of short term plasticity and long term plasticity. This study demonstrates that HfO2 with abundant hafnium vacancies is a potential prototype material that can be fabricated as an artificial synaptic device for mimicking the synapse of the human brain.
研究领域:
神经形态计算
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材料科学
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电子工程
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DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Chuan Hu,Fengli Wei,Qinrui Liang,Qiming Peng,Yuting Yang,Tayirjan Taylor Isimjan,Xiulin Yang
The construction of oxide/metal composite catalysts is a competent means of exploiting the electronic interactions between oxide/metal to enhance catalytic activity. In this work, we construct a novel heterogeneous composite (Ru/HfO 2 -NC) with Ru/HfO 2 nanoparticles nested in nitrogen-doped porous carbon via a zeolitic imidazole frameworks-assisted (ZIF) co-precipitation and calcination approach. In particular, ZIF guides an in-situ construction of nested configuration and confines the scattered nanoparticles. Strikingly, Ru/HfO 2 -NC exhibits unusual ORR activity, superb durability, and methanol tolerance in 0.1 M KOH solution with high half-wave potential ( E 1/2 ) of 0.83 V and follows a near-4e − reaction pathway. Additionally, the ZAB assembled with cathodic Ru/HfO 2 -NC outputs a power density of 157.3 mW cm −2 , a specific capacity of 775 mA h g Z n - 1 , and a prolonged lifespan of 258 h at 5 mA cm −2 . Meanwhile, the catalyst has demonstrated potential applicability in flexible ZAB. As suggested by experimental results and density functional theory (DFT) analysis, the remarkable property possibly originated from the optimization of the adsorption and desorption of reactive intermediates caused by the reconfiguration of the electronic structure between Ru and HfO 2 .
研究领域:
材料科学
·
电化学
·
理论计算
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DOI
高影响因子
Materials Today Bio
·
2025
·
IF 10.2
Xinying Liu,Baohui Liu,Conglong Chen,Chaowei Hong,Jia Xu,Yixuan Ruan,Ling Huang,Shanni Hong,Wei Chen,Ye Kuang
A significant challenge in modern radiotherapy (RT) is to minimize the detrimental effects on adjacent healthy tissues while concurrently increasing the susceptibility of tumor tissue to radiation. Investigating nanoradiosensitizers with multifunctional properties has a lot of potential as a highly effective strategy for augmenting the efficacy of RT. A novel Janus Ag/Fe-HfO 2 nanoparticle was synthesized in a single-step process. This versatile nanoradiosensitizer combines photothermal capabilities, enzyme-like activities, and the capacity for magnetic resonance imaging (MRI). The surfaces have been meticulously engineered with PEG to boost biocompatibility and adorned with RGD-targeting peptides that selectively target tumor cells (Ag/Fe-HfO 2 -PEG-RGD). The characterization results have demonstrated the successful preparation of Janus Ag/Fe-HfO 2 nanoparticles with a diameter of roughly 10 nm. Furthermore, the photothermal properties, MRI ability, and enzymatic catalytic activities (generate O 2 , produce hydroxyl radical, and consume GSH) of Ag/Fe-HfO 2 -PEG-RGD were verified in vitro experiments. In vivo experiments, by integrating T 1 -weighted MRI-guided RT with the enzymatic activities of these nanoparticles, along with the application of photothermal heating, we have achieved a synergistic enhancement in the therapeutic efficacy of RT. Moreover, it stimulates tumor-specific immune responses, leading to an increased presence of tumor-infiltrating CD8 + T cells. This integrated multimodal nanotherapeutic platform, which capitalizes on the potent enhancement of RT effects, offers a promising new strategy in the ongoing battle against cancer.
研究领域:
纳米医学
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肿瘤学
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放射治疗
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磁共振成像
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生物无机化学
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诊疗一体化
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免疫治疗
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 2
·1176-1184
·
IF 11.9
Liwei Su,Lei Zhang,Xingyi Zhan,Yifan Zhang,Lianbang Wang,Yuanhao Wang
Developing efficient cathode catalysts in lithium–oxygen batteries is urgent to solve their challenging problems, such as sluggish Li–O reaction kinetics, low reversible capacities, and short lifespan. This work reports HfO2 as a cathode catalyst for Li–O2 batteries for the first time and studies its working mechanism, activation behavior during cycling, and reversible oxygen defect evolution. First-principles calculations show that fluorite-structured HfO2 has suitable adsorption energy for LiO2, which helps Li2O2 grow in the shape of nanosheets, thereby improving the ultimate discharge capacity and cycling performance. Ex situ techniques (scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy) verified the changes in discharge products during cycling. LiO2 decomposes preferentially over Li2O2 during charging, which differs from previous reports. HfO2 undergoes reversible redox reactions upon cycling, accompanied by rocking-chair oxygen defects. Appropriate oxygen defect contents (6.81–9.32%) can promote the Li–O reaction. On this basis, sub-10 nm oxygen-defect-riched HfO2 particles are homogeneously dispersed on nitrogen-doped carbon nanosheets through the sol–gel method, boosting the battery performance.
研究领域:
材料科学
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电化学
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电池技术
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催化
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DOI
高影响因子
ACS Omega
·
2026
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IF 5.2
Lei Cao,Dan Xu,Muyun Han,Huicun Zhao,Yonghao Han
Dielectric properties are one of the important attributes of materials, whose enhancement is of significant importance for practical applications. In this work, the dielectric properties of HfO2 were studied under high pressure by combining in situ Raman scattering, alternating-current (AC) impedance spectroscopy measurements, and differential charge density calculations. It was found that HfO2 undergoes pressure-induced irreversible phase transitions from P21/c to Pbca and then to the Pnma structure, and its high-pressure Pnma structure can be retained at atmospheric pressure. AC impedance spectroscopy measurements revealed that the relative permittivity of HfO2 has not only been increased by approximately 3 times after a cycle of compression and decompression but also the dielectric loss factor has been dramatically decreased, indicating that an obvious enhancement of dielectric performance has been obtained. Differential charge density calculations suggested that a large number of electrons transferred from Hf4+ cations to O2– anions could be the physical origin of the increase of electric dipole moments in HfO2 and the enhancement of dielectric properties.
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高影响因子
npj Flexible Electronics
·
2025
·Vol. 9
·期 1
·1-10
·
IF 15.5
Pang Jinglin,Duan Tianpeng,Liao Min,Jiang Limei,Zhou Yichun,Yang Qiong,Liao Jiajia,Jiang Jie
As the core component of ferroelectric memories, HfO 2 -based ferroelectric thin films play a crucial role in achieving their excellent storage performance. Here, we improved the ferroelectric properties and domain switching properties through in situ stress loading during annealing. The thin films are annealed under different bending states by applying different stress actions, and it is observed that, within a certain range of stress bending, the optimization of the ferroelectric properties of the annealed thin films can reach an extreme value. Specifically, under the influence of a small electric field, the 2 P r values of thin films annealed at +10 and −10 mm increased by 87.1% and 71.1%, respectively, compared with the unbent films. Additionally, these thin films exhibit extremely high domain wall mobility and excellent domain switching capabilities. Once the ferroelectric phase is formed through in situ stress modulation, it remains stable even under multiple service environments.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
·
2021
·Vol. 40
·期 1
·
IF 2.427
Hsain Hanan Alexandra,Lee Younghwan,Materano Monica,Mittmann Terence,Payne Alexis,Mikolajick Thomas,Schroeder Uwe,Parsons Gregory N.,Jones Jacob L.
Although 10 years have passed since the initial report of ferroelectricity in hafnia (HfO 2 ), researchers are still intensely fascinated by this material system and the promise it holds for future applications. A wide variety of deposition methods have been deployed to create ferroelectric HfO 2 thin films such as atomic layer deposition, chemical solution deposition, and physical vapor deposition methods such as sputtering and pulsed laser deposition. Process and design parameters such as deposition temperature, precursor choice, target source, vacuum level, reactive gases, substrate strain, and many others are often integral in stabilizing the polar orthorhombic phase and ferroelectricity. We examine processing parameters across four main different deposition methods and their effect on film microstructure, phase evolution, defect concentration, and resultant electrical properties. The goal of this review is to integrate the process knowledge collected over the past 10 years in the field of ferroelectric HfO 2 into a single comprehensive guide for the design of future HfO 2 -based ferroelectric materials and devices.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Kemin Wang,Xiaofeng Liu,Zijun Zhao,Luyao Li,Jiajun Tong,Qian Shang,Yiwei Liu,Zhiyong Zhang
Field-effect transistor (FET) biosensor has received widespread attention due to their unique high-sensitivity properties. In conventional FET biosensors, the complicated interaction between the sample solution and the semiconductor channel always results in poor stability. Especially for FET-based pH sensors, the interface failure caused by the harsh acid-base working environment makes accurate, continuous, and low hysteresis pH measurement quite challenging. Here, we report a carbon nanotube (CNT)-FET pH sensor with enhanced environmental stability by introducing HfO 2 film into the gate insulator. The proposed devices show desired immunity to environmental interference including various chemical and physical factors. More importantly, we verified the feasibility of this CNT-FET device for continuous pH sensing, which demonstrates a sensitivity of 67.62 mV/pH, a wide pH range of 1.34–12.68, and low hysteresis of 500 pA with pH switching loops of 4.22–10.24. This work not only realizes a high-performance pH sensor but also paves the way for the development of FET biosensors with high environmental stability, which is of great significance for FET biosensors to maintain normal working performance in complex systems.
研究领域:
生物传感技术
·
材料科学
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DOI
高影响因子
Nanoenergy Advances
·
2026
·Vol. 6
·期 3
·21
·
IF 4.2
Rui Li,Yuqing Chen,Yujie Long,Xinhai Dong,Jiajun Wang,Quansheng Guo,Hongyang Zhao,Xiulin Huang,Tingting Jia
Y-doped HfO2ferroelectric thin films were fabricated via the sol–gel chemical solution deposition method. The effects of Y doping concentration, film thickness, and annealing temperature on the structure, morphology, and electrical properties were systematically investigated. The results demonstrate that doping concentration, film thickness, and annealing temperature can significantly regulate the crystalline phase composition. Appropriate doping, moderate film thickness, and suitable annealing temperature effectively stabilize the ferroelectric orthorhombic phase and suppress the monoclinic phase. The optimized film is obtained under the conditions of 4 mol% Y doping, a film thickness of 59.2 nm, and rapid thermal annealing at 600 °C, which exhibits the best crystallinity, dense and flat surface, and moderate oxygen vacancy concentration. The optimized sample shows a remnant polarization of 86.9 μC/cm2, a coercive field of 1.1 MV/cm, and a leakage current density as low as 9.77 × 10−6A/cm2, representing the best ferroelectric performance. This study provides a reliable process and experimental basis for the preparation of high-performance HfO2-based ferroelectric thin films by the sol–gel method.
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DOI
高影响因子
ACS Nano
·
2026
·
IF 17.3
Guo Mengen,Sun Pengcheng,Xu Wenjie,Hao Xinyan,Tang Tiantian,Liu Xinying,Liao Dehua,Zhao Jiangshan,Huang Hai,Li Muyan,Xu Linghao,Lin Jianing,Peng Yanjin,Zhang Xinfeng,Hu Xiongbin,Xiang Daxiong,Wu Junyong
Radiotherapy (RT) efficacy in aggressive
solid tumors is hindered
by lactate-driven metabolic radioresistance and an immunosuppressive
microenvironment. Here, we engineer a living biointerface (SHT) via
in situ biomineralization of HfO 2 /TiO 2 onto
an electrogenic Shewanella oneidensis chassis to address this multifaceted challenge. This structural
integration bridges the bacterial metabolism with interfacial radiocatalysis.
The TiO 2 shell acts as an efficient electron acceptor to
accelerate bacterial extracellular electron transfer, driving rapid
intratumoral lactate depletion, while the high-Z HfO 2 core
enhances the X-ray energy deposition. Under irradiation, this synergistic
biointerface initiates an oxidative burst and irreversible DNA damage,
dismantling the lactate-associated antioxidant defense. In radioresistant
triple-negative breast cancer models, this localized physicochemical
disruption translates into tumor suppression, accompanied by immunogenic
cell death and cGAS-STING pathway activation, reprogramming the immunosuppressive
niche. Furthermore, the SHT platform demonstrates systemic biocompatibility,
alongside RT-gated self-limiting clearance. Collectively, this work
establishes a bioelectrogenic material platform that integrates metabolic
barrier dismantling, radiocatalytic sensitization, and immune remodeling
for refractory cancer therapy.
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DOI
高影响因子
CORROSION SCIENCE
·
2021
·
IF 7.205
Mingde Tong,Qiangang Fu,Mingyu Liang,Tao Feng,Wanbo Hou,Jia Sun,Xinhao Shi
To optimize the impact-ablation resistance of SiC nws @PyC/HfC coating, PyC-SiC double-layer interface phase was introduced. After impacting test, the crack widths of SiC nws @PyC-SiC/HfC were much lower than that of SiC nws @PyC/HfC coating. The impact-ablation resistance of SiC nws @PyC-SiC/HfC coating was better than that of SiC nws @PyC/HfC coating. The good impact-ablation resistance SiC nws @PyC-SiC/HfC coating attributed to the two-grade pull-out reinforcement effect, self-sealing function of Hf-Si-O glass generated from oxidation of SiC nws @PyC-SiC core-shell structure and the precipitation of HfO 2 grains from Hf-Si-O glass under ablation environment.
研究领域:
材料科学
·
航空航天工程
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DOI
高影响因子
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