SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Weiwei Meng,Lei Dai,Yuehua Li,Zhangxing He,Wei Meng,Huizhu Zhou,Ling Wang
Mixed potential NH 3 sensors with La 9.95 K 0.05 Si 5 AlO 26.45 (LKSAO) as the solid electrolyte and Bi 1-x Ag x VO 4- δ as the sensing electrode (SE) were developed. Bi 1-x Ag x VO 4- δ was produced by solid state reaction and then characterized by XRD, XPS, SEM and EDS. As revealed from the results, The BiVO 4 samples exhibit an unchanged crystalline structure after Ag doping molar amount x≤0.2, accompanied by the growth of the particle. The sensor based on Bi 1-x Ag x VO 4 - δ exhibit the noticeably enhanced sensing performance to NH 3 in contrast to the sensor using BiVO 4 , including its larger response potential (Δ V ) and higher sensitivity. For instance, the sensors based on BiVO 4 and Bi 0.8 Ag 0.2 VO 4 - δ at 400 °C exhibit the sensitivities of -28.1 and -77.3 mV/decade, respectively. Nevertheless, by Ag doping, there is no effective improvement of the anti-interference ability of the sensor against NO and NO 2 . To address the mentioned problem, CuO, NiO and La 0.8 Sr 0.2 MnO 3 (LSM) were used as reference electrodes (RE). As suggested from the results, using CuO and NiO as the reference electrodes can obviously reduce the cross-sensitivity of the sensor to NO and NO 2 , whereas the sensitivity slightly decrease.
研究领域:
材料科学
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2017
·Vol. 47
·期 3
·1847-1858
·
IF 1.579
Jing W. X.,Shi J. F.,Xu Z. P.,Jiang Z. D.,Wei Z. Y.,Zhou F.,Wu Q.,Cui Q. B.
Batches of un-doped and Ag-doped ZnO nanowires (ZnONWs) were prepared hydrothermally on stainless steel wire sieves at varied Zn 2+ concentrations of the growth solution and at different Ag + concentrations of the silver nitrate solution. Methylene blue solution was degraded with these as-prepared ZnONWs in the presences of ultraviolet irradiation. It is found that both the processing parameters greatly affect the surface textures, wettability, and photo-activity of the ZnONWs. The latter synthesizing parameter is optimized only after the former one has been finely regulated. The un-doped and Ag-doped ZnONWs at Zn 2+ concentration of 75 mM of the growth solution and at Ag + concentration of3 mM of the silver nitrate solution both produce Gaussian rough surfaces and in each batch are most hydrophilic. Therefore, in the related batch the contacting surface area of the catalyst is the largest, the hydroxyl radicals attached on the top ends of corresponding ZnONWs the most, and the catalytic activity of these catalysts the optimal. Besides these, the latter synthesizing parameter affects the photo-activity of Ag-doped ZnONWs more significantly than the former one does that of un-doped ZnONWs.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Yanting Dou,Zhiman Liang,Zhenhe Xu,Yuanjin Wang,Jiqi Zheng,Dongling Ma,Yu Gao
Photocatalysis is considered a promising technology to alleviate the energy crisis and environmental pollution; however, developing photocatalysts with improved light absorption efficiency is still a challenge. In this work, an effective strategy was proposed to synthesize a highly functional ternary nanocomposite (g-C3N4/RGO/AZIS) by coupling broader light-absorbing Ag-doped ZnIn2S4 (AZIS) nanoplates with ultrathin g-C3N4 and reduced graphene oxide (RGO) nanosheets. The 2D-on-2D stacking nanostructure of the composite provides a compact heterojunction, enlarged interfaces, and enriched active sites, resulting in the accelerated separation and relocation kinetics of charge carriers. Benefiting from these advantages, the g-C3N4/RGO/AZIS nanocomposite with systematically optimized contents of RGO and AZIS can serve as an efficient bifunctional photocatalyst for both H2 production from water splitting and methyl orange (MO) photodegradation under the irradiation of visible light. The H2 production rate of the ternary nanocomposite is 658.5 μmol h–1 g–1, which is 38 times higher than that of plain g-C3N4. The operation mechanism is proposed based on the results of scavenger tests and photoelectrochemical analysis. The formation of a type-II heterostructure between AZIS nanoplates and g-C3N4 nanosheets along with RGO with lower potential can maximize the separation efficiency of photogenerated electron–hole pairs and decrease the charge recombination. This work provides a viable strategy to develop bifunctional photocatalysts with enhanced performance for both H2 production and degradation of organic dyes.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 16
·21297-21307
·
IF 2.478
Cao Yong,Luo Penghui,Xu Yang,Zhang Cong,Tian Chang,You Yuanqi,Tian Meiling,Wang Liqiong,Zhou Shenggang
In this paper, a hydrothermal synthesis method synthesized a foamed nickel (NF)-supported Ag-doped Ag 2 S@MoS 2 hydrogen evolution catalyst. Silver doping can improve the conductivity of MoS 2 , thereby improving the hydrogen evolution activity of MoS 2 . Compared with a single MoS 2 , the Ag 2 S@MoS 2 electrode has a larger specific surface area and has many highly catalytic S edges. In 1 M KOH, the overpotential of Ag 2 S@Ag 0.33 MoS 2 /NF electrode at 10 mA cm −2 is approximately 188 mV. Comparing with the overpotential of NF (391 mV) and MoS 2 /NF (290 mV), it is much lower. Further changing the amount of silver added, the overpotential of Ag 2 S@Ag 0.5 MoS 2 /NF is further reduced to 165 mV at a current density of 10 mA cm −2 . When the voltage is 0.35 V, the current densities of Ag 2 S@Ag 0.33 MoS 2 /NF (42.45 mA cm −2 ) and Ag 2 S@Ag 0.5 MoS 2 /NF (55.5 mA cm −2 ) are higher than those of NF (4.91 mA cm −2 ) and MoS 2 /NF (20.51 mA cm −2 ).
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
·
2023
·
IF 3.3
Lanpeng Guo,Hongping Liang,Dongmin An,Huimin Yang
Noble metal doping is considered to be an efficient way to promote the gas sensing performances of metal oxide semiconductor nanomaterials . In this study, uniform silver (Ag)-doped tin dioxide (SnO 2 ) nanoparticles were successfully synthesized through a facile one-step hydrothermal route. The diameter of Ag/SnO 2 nanoparticles is less than 10 nm. Compared with pure SnO 2 -based sensor, the Ag/SnO 2 -based sensors are found to effectively improve their sensitivity and selectivity to ethanol. In particular, the 6% Ag/SnO 2 -based sensor displays a high response (Ra/Rg = 135) to 50 ppm ethanol at 180 °C. The enhancement of ethanol sensing properties of the 6% Ag/SnO 2 sample due to the small size of SnO 2 and catalytic sensitization effect of Ag, as well as the Schottky barrier forms between SnO 2 and Ag. These results suggest that the Ag-doped SnO 2 nanoparticles acting as a promising functional composite material have potential application for ethanol sensors.
研究领域:
材料科学
·
化学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yanting Dou,Bobo Bai,Jiqi Zheng,Xiufang Wang,Yu Gao,Yi Li,Qiuhui Bu,Fu Ding,Yaguang Sun,Zhenhe Xu
The effective combination of two metallic sulfides to form a heterojunction and regulate semiconductor structure can significantly improve the response of photocatalysts under visible light. In this study, we have successfully grown Ag-doped ZnIn2S4 nanosheets randomly on carefully designed hollow Co9S8 polyhedral nanocages to construct the Co9S8/Ag:ZnIn2S4 heterojunction. The optimized 1.0 wt % Co9S8/Ag:ZnIn2S4 heterostructure shows excellent activity with the H2 generation rate of 1947.7 μmol g–1 h–1, which is 1.58 times greater than the Ag:ZnIn2S4 (1232.0 μmol g–1 h–1). However, pure Co9S8 has a narrow band gap but almost no response in visible light due to the fast photogenerated carrier recombination rate. The degradation trend of methyl orange (MO) in all as-prepared samples is the same as that of hydrogen production. The compound with the Co9S8 mass fraction of 1.0 wt % has the fastest degradation rate and can completely degrade MO within 16 min. In addition, the Co9S8/Ag:ZnIn2S4 heterostructure has also shown long-term stability after 20 photocatalytic hydrogen evolution and MO degradation cycle experiments, respectively. This work highlights the significance of improving the photocatalytic performance by modulating the morphology of metallic semiconductors and constructing heterostructures.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Dequan Xiao,Yan Gong,Jing Zhang,Hui Liu,Lile Dong
Triple-negative breast cancer (TNBC) is one of the most aggressive and challenging subtypes with limited treatment options and poor prognosis. To overcome these obstacles, Ag-doped SnSe (ASS) nanosheets were used as photonic hyperthermia agents for treating TNBC. ASS featured a high photothermal-conversion efficiency and photon hyperthermia effect. Additionally, biosafety assessments, including hemolysis assays and histopathological analysis, confirmed that ASS was biosafety. These findings suggest that ASS, in synergy with the second near-infrared biowindow (NIR-II) light irradiation, offers a noninvasive, effective, and safe therapeutic strategy for TNBC. This innovative approach exemplifies the evolving landscape of TNBC treatment, where technology and biology converge to offer more precise and personalized therapies.
研究领域:
肿瘤学
·
纳米医学
·
生物材料学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Wenqian Yan,Kunmeng Zhu,Yi Cui,Yanhan Li,Tao Dai,Sheng Cui,Xiaodong Shen
A new material of Ag-SnO 2 /rGO aerogel is fabricated by the sol-gel method and freeze-drying technique. The SnO 2 particles are tightly arranged on the rGO sheets to form a p-n heterojunction , and the rGO aerogel possesses abundant pore structures for effective adsorption. Besides, the Ag particles are dispersed on the surface as a catalyst to improve the internal electron mobility, further promoting the gas-sensing performance. To be noted, the Ag-SnO 2 /rGO aerogel can exhibit a response of 2.13 towards 50 ppm NO 2 at RT instead of heating conditions, and shows a cyclic capacitance property of redox. Moreover, the non-linear growth between gas concentration and response is observed, which proves the chemical adsorption that results in the high selectivity.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 4
·2975-2989
·
IF 2.993
Zhang Yuheng,Gong Mindong,Liu Xi,Ji Lijun,Yang Zhenglong,Zhu Xiashi
Titanium oxide (TiO 2 ) has been widely investigated as a photocatalytic material for degradation of organic pollutant in waste water. However, nanosized granular TiO 2 nanoparticles are hard to be recycled and re-utilized in water and many cause secondary pollution of water. Hence, we constructed a foam-like photocatalyst, which was composed of carbonaceous support: activated carbon nanotube foams and Ag-doped TiO 2 nanoparticles through a method of a template synthesis and carbonization strategy. The as-prepared photocatalyst evidenced to be hierarchical macroporous and mesoporous and exhibited remarkable photocatalytic performance toward the degradation of unsymmetrical dimethylhydrazine under UV and visible light. The structure characterization and photocatalytic performance investigation confirmed that the enhanced photoresponse was attributed to the high efficiency of charge separation and the surface plasmon resonance effect of metallic Ag. The adsorption synergetic effect of the hierarchical porous structure also played an important role in photodegradation. The as-prepared photocatalyst showed great potential in the treatment of waste water containing organic pollutant.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Lu Zou,Yunfeng Tian,Jian Pu,Bo Chi
Low-temperature operation of reversible solid oxide cells can effectively improve their stable and economical application. However, insufficient catalytic activity of the air electrode is the limiting factor for reversible solid oxide cells. Here, we fabricate a novel Pr 0.9 Ag 0.1 Ba 0.5 Sr 0.5 Co 2 O 5+δ nanofibers with enhanced electrocatalytic activities via an electrospinning technique and in-situ exsolution. The study confirms the advantage of morphology engineering in enlarging the catalytic interface and reactive sites, and the cells with Pr 0.9 Ag 0.1 Ba 0.5 Sr 0.5 Co 2 O 5+δ nanofibers air electrode exhibit obviously decreased polarization resistance (0.06 Ω cm 2 ), increased electrolysis current density of 0.65 A cm -2 (50 vol% absolute humidity and 1.5 V), and adequate power density (~ 0.5 W cm -2 ) at 700 °C. Also, the cell exhibits exceptional reversibility and stability during the long-term test. The enhancement may be assigned to the in-situ exsolution of Ag nanoparticles at Pr 0.9 Ag 0.1 Ba 0.5 Sr 0.5 Co 2 O 5+δ surface and better interface combination between the air electrode and electrolyte. This work provides an exemplificative study on the favorable nanofibers air electrode for high performance intermediate temperature reversible solid oxide cells.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yucheng Li,Kuan Ren,Shuai Cheng,Yahua Hu,Xuechun Yang,Shutong Hao,Shenye Liu,Naixin Li,Zhan Xu,He Feng,Xing Zhang,Tao Xu,Xiaoyan Zhou,Yuji Wu,Zhenghua Yang,Pin Yang,Jianjun Dong,Yulong Li,Huiyue Wei,Xiaoshi Peng,Xiangming Liu,Zanyang Guan,Zhiwen Yang,Jin Li,Yunsong Dong,Dong Yang,Tao Yi,Jiamin Yang,Yongkun Ding,Zhixiang Sun,Xiaolin Liu,Mu Gu,Jingtai Zhao,Guang Yang,Qianli Li
The ultrastable encrypted storage of X-ray image with quantitative and ultrahigh-spatial resolution are crucial for a wide range of applications in radiation imaging, and it can be achieved by using the radio-photoluminescence (RPL) material, Ag-doped phosphate glass (Ag-PG), which was fabricated via the melt-quenching method. Under X-ray irradiation, Ag-PG produces a luminescence center, obvious 650 nm emission peak, which can be repeatedly excited by ultraviolet light without intensity attenuation. Quantitative X-ray image storage was realized based on the linear relationship between RPL intensity and X-ray irradiation time. X-ray image with a submicron spatial resolution of 0.7 µm was achieved, which could be stably stored without attenuation for more than 300 days. This submicron level X-ray image can be written into the Ag-PG as an encrypted information, and can only be visualized by an ultraviolet light. Additionally, heat treatment (400 °C for 2 h) could eliminate the influence of X-ray radiation on the Ag-PG, and restore the state of the Ag-PG before X-ray irradiation, which allows the recyclability and reusability of the Ag-PG. This research is of great significance for promoting the encrypted storage of X-ray images based on Ag-PG or other RPL materials.
研究领域:
材料科学
·
医学影像学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jian Yu,Hongpan Zhu,Zizhen Zhou,Xiaofang Liu,Guang Han,Bin Zhang,Xu Lu,Guoyu Wang,Xiaoyuan Zhou
Mg-based compounds are emerging materials for efficient thermoelectric conversion, as exemplified by n-type Mg 3 Sb 2 -based materials, while a high performing p-type Mg 3 Sb 2 material is lacking. EuMg 2 Sb 2 , a derivative of Mg 3 Sb 2 , has revealed potential as a high-performance alternative to p-type Mg 3 Sb 2 -based materials, while pristine EuMg 2 Sb 2 suffers from low carrier concentration. Herein, we reveal that both Zn substitution for Mg and Yb substitution for Eu not only boost the carrier concentration and mobility of p-type EuMg 2 Sb 2 -based materials, but also sharply diminish the lattice thermal conductivity via enhancing phonon scattering. Band structure calculation shows that Zn substitution minimizes the energy difference between different bands at the valence band maximum and reduces the band effective mass, leading to optimized band structure. Combined with the role of Ag doping in increasing the carrier concentration and power factor, p-type Eu 0.5 Yb 0.5 Mg 1.0975 Zn 0.9975 Ag 0.005 Sb 2 sample obtains a maximal dimensionless figure of merit ( zT ) value of 1.18 at 823 K, which compares favorably to those of EuMg 2 Sb 2 and other p-type Mg–Sb-based Zintl materials. This study demonstrates the efficacy and importance of delicate composition engineering in boosting the thermoelectric performance of p-type EuMg 2 Sb 2 .
研究领域:
材料科学
·
热电学
·
固体物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）