Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Chuanhao Li,Yi Tian,Shuangyu Wang,Ping Yang,Xiao Zhang
To improve the stability of Ag based co-catalysts and to increase the photocatalytic performance of graphitic carbon nitride (g-C 3 N 4 ), Ag 2 Se nanoparticles were grown onto superior thin sulfur-doped g-C 3 N 4 nanosheets which was fabricated via two-step thermal polymerization at high temperature. Ultrathin S-doped g-C 3 N 4 nanosheets were prepared via two-step thermal polymerization using melamine and thiourea. The ratios of Ag 2 Se were adjusted to fabricate a series of Ag 2 Se/S-g-C 3 N 4 (Ag 2 Se/SCN) composite samples by controlled solvothermal synthesis. S-doping plays an important role in mono-dispersion of Ag 2 Se nanoparticles on S-g-C 3 N 4 nanosheets because of the control of growth sites. The photocatalytic removal of tetracycline hydrochloride test indicates that sample Ag 2 Se/SCN-3 with Ag 2 Se loading of 3 % reveals the best removal effect, in which tetracycline hydrochloride of 60 % is removed within 60 min. Photocatalytic hydrogen generation test results without co-catalyst addition demonstrate that sample Ag 2 Se/SCN-3 exhibits the best H 2 evolution rate of 2116.35 μmol·g −1 ·h −1 , which is 3.8 times of that of pure carbon nitride. The photocatalytic mechanism tests suggest that Schottky heterojunctions are formed in the Ag 2 Se/S-g-C 3 N 4 composites. The formation of Schottky heterojunctions improved the separation efficiency of photogenerated charge carriers. The incorporation of Ag 2 Se nanoparticles (as the co-catalyst) on S-g-C 3 N 4 nanosheets is the key for drastically improving the photocatalytic performance and eliminating the use of Pt co-catalyst during the photocatalytic processes.
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
Kai Wang,Ku-Han Deng,Yi-Shen Tian,Meng-Ying Sun,Zi-li Yu,Zhi-Quan Tian,Zhi-Ling Zhang
Fluorescence in the near infrared IIb window (NIR-IIb, 1500–1700 nm) shows higher signal-to-noise ratio, better space-time resolution, and deeper tissue penetration. However, materials with excellent fluorescence properties in the NIR-IIb region were rarely reported. Ag2Te quantum dots (QDs) could emit variable fluorescence in the NIR-II window due to their narrow band gap. Unfortunately, the fluorescence in the NIR-IIb region was not strong enough to image in vivo because the lattice defects on the surface of Ag2Te increased non-radiative transitions and decreased fluorescence performance. In this work, we coated a Ag2Te core with a Ag2Se shell to passivate the lattice defects and enhance its fluorescence efficiency. The fluorescence property of the as-prepared Ag2Te/Ag2Se core/shell QDs is more than 10 times stronger than that of Ag2Te. The brighter Ag2Te/Ag2Se QDs showed high-resolution in vivo imaging in the NIR-IIb region to distinguish thin blood vessels up to 66 μm. Overall, Ag2Te/Ag2Se QDs with excellent fluorescence in the NIR-IIb region were prepared and showed great potential for biomedical imaging.
研究领域:
材料科学
·
生物医学工程
·
光学成像
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Baoquan Feng,Yiran Cheng,Chengyan Liu,Jie Gao,Guojing Wu,Xiaobo Bai,Ruifan Si,Wenpei Li,Yue Guo,Lei Miao
Ag2Se-based thermoelectric (TE) materials have attracted significant attention recently due to their potential application near room temperature. Manipulating the stoichiometric ratio of Ag/Se and anion doping are usually used as effective approaches to enhance the TE properties. Here, we report a strategy to simultaneously enhance the power factor (PF) and reduce the thermal conductivity of Ag2Se by introducing ZnSe nano-precipitates. The excessive carrier concentration in the intrinsic Ag2Se is successfully reduced by the Ag interstitial inhibition due to the introduction of secondary-phase ZnSe nano-precipitates, thereby enhancing the PF up to a maximum value of ∼22.2 μW m–1 K–2 at 383 K and decreasing the electronic thermal conductivity from ∼1.2 to ∼0.8 W m–1 K–1 at 383 K. In addition, the phonon scattering at ZnSe nano-precipitates contributes to the reduction of lattice thermal conductivity from ∼0.5 to ∼0.4 W m–1 K–1 at 383 K. As a result, a high peak zT of ∼0.7 at 383 K and an average zT of 0.6 at 313–383 K are obtained in the sample Ag2Se-0.005ZnSe, which is one of the highest values amongst Ag2Se-based TE materials. This study could provide guidance to improve the TE properties of materials similar to Ag2Se.
研究领域:
材料科学
·
热电性能优化
✓ 已验证
DOI
高影响因子
ACTA MATERIALIA
·
2021
·
IF 8.203
Jie Chen,Qiang Sun,Deyu Bao,Bang-Zhou Tian,Zegao Wang,Jun Tang,Dali Zhou,Lei Yang,Zhi-Gang Chen
Thermoelectric materials strengthened by defect engineering can also suffer from the compromise of plasticity, and in turn results in negative effect on the processability, reliability and durability of thermoelectric devices. Here, we introduce nano-twinned CuAgSe secondary phase to achieve simultaneously increased compressive strength and plasticity of the β-Ag 2 Se pellets without obviously sacrificing the thermoelectric performance, as evidenced by our thermoelectric measurements. Our pellet shows a maximum compressive strength of 96 MPa, which is ∼104% higher than that of pristine Ag 2 Se, ascribed to the impeded crack propagation by the CuAgSe secondary phase. An extraordinary deformation value of ∼19% is observed at the maximum compressive strength, which is attributed to the intrinsically large plastic deformation of the Ag 2 Se matrix, the deformable nano-twinned CuAgSe secondary as well as the interaction between the Ag 2 Se matrix and the CuAgSe secondary phase. This work indicates that introducing nano-twinned secondary phase in thermoelectric materials is a promising strategy for developing high-performance thermoelectric materials with high strength and plasticity.
研究领域:
材料科学
·
热电学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhen-yu Yang,Xin-zheng Jin,Chen-hui Huang,Yan-zhou Lei,Yong Wang
The enthusiasm for environmental energy harvesting has triggered a boom in research on photo-thermoelectric generators (PTEGs), and the relevant applications are mainly focused on self-energy supply sensors owing to the limitations of their output performances. For this purpose, high-output hierarchical heterogeneous PTEGs were constructed by assembling separately optimized thermoelectric (TE) and photothermal (PT) layers. The pressure and temperature conditions of Ag2Se films during the pressing process were first explored, and the sample with the optimal performance and least defects was selected as the TE layer. At the same time, different morphologies of polypyrrole (PPy) PT layers were electrochemically synthesized. It is found that the three-dimensional structure of Bushy-PPy could effectively improve the light absorption and thus enhance the PT conversion performance. The final assembled PTEG can produce an output voltage of −9.03 mV and an output power of 3.53 μW under the irradiation of a near-infrared light source of 300 mW cm–2 without a cooling source, and it can also achieve considerable output power under visible light irradiation of different intensities. Combining its high retentions of electrical conductivity (99%) and output performance (97%) after 1000 bending-tension cycles, it is proven to be a promising next-generation wearable flexible energy harvesting device.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Shanshan Tan,Hanwen Hu,Yuan Wang,Li Ma,Luping Song,Jun Tang,Hongju Zhou,Kun Zheng,Guangkun Ren,Lei Yang
Compositing a secondary phase in Ag 2 Se can usually tune the electron and phonon scattering to improve the thermoelectric performance. However, the intrinsically high carrier concentration still limits the performance optimization. Here, we employ a modulation decoration strategy to simultaneously achieve submicron-scale constituents and compositional modification for synergistic optimization of thermoelectric properties . Amorphous nano Sb 2 S 3 has been decorated on the surface of Ag 2 Se powders, and S was added into the Ag 2 Se matrix through an ion exchange reaction accompanied by the formation of a crystal/amorphous mixed secondary phase of Sb 2 (S, Se) 3 . The S doping reduced the excessive intrinsic carrier concentration, leading to modified electrical transport properties and significantly reduced electrical thermal conductivity. On the other hand, introducing the S dopants and the crystal/amorphous interfaces into the Ag 2 Se matrix could increase the lattice anharmonicity, further contributing to the reduced thermal conductivity. Consequently, the Ag 2 Se-0.4 % Sb 2 S 3 sample obtains a high average zT value of > 1 in the temperature range of 300–390 K. In addition, the maximum cooling temperature difference of over 85 K can be predicted in an Ag 2 Se/Ag 2 Se-0.4 % Sb 2 S 3 segregated module at the hot side temperature of 350 K.
研究领域:
材料科学
·
热电材料
·
凝聚态物理
·
纳米复合材料
·
能量转换
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Qin-Xue Hu,Wei-Di Liu,Li Zhang,Wei Sun,Han Gao,Xiao-Lei Shi,Yan-Ling Yang,Qingfeng Liu,Zhi-Gang Chen
High power factor contributes high power generation output while high bending resistance extends the service life in flexible thermoelectric device. Here, we report an in situ grown 10 mol% single-walled carbon nanotubes (SWCNTs) and Ag 2+y Se (named as 10 mol% SWCNTs/Ag 2+y Se) film, which shows a high power factor of 19.36 μWcm −1 K −2 at 300 K and excellent bending resistance. Such a high power factor is attributed to the enhanced carrier concentration and enlarged effective mass, induced by the additional interstitial Ag in the in situ grown Ag 2 Se on SWCNTs . Moreover, the 10 mol% SWCNTs/Ag 2+y Se film can remain 95 % of the initial electrical conductivity after 1000 bending cycles at the radius of 5 mm, indicating an excellent bending resistance. In addition, this film was assembled into a flexible thermoelectric power generator, which can achieve an output power of 0.72 μW and an open-circuit voltage of 18.17 mV at a temperature difference of 30 K. This study indicates that in situ compositing Ag 2 Se on SWCNTs can realize the increased thermoelectric performance and bending resistance, which drives the application of Ag 2 Se-based flexible films.
研究领域:
材料科学
·
热电学
·
纳米技术
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
Applied Materials Today
·
2019
·
IF 8.013
Kaimin Du,Pengpeng Lei,Lile Dong,Manli Zhang,Xuan Gao,Shuang Yao,Jing Feng,Hongjie Zhang
A novel multifunctional theranostic nanoplatform was fabricated via in situ growth of ultrasmall Ag 2 Se nanodots on the surface of chitosan (CS) coated NaYF 4 :Yb/Er@NaLuF 4 :Nd/Yb@NaLuF 4 upconversion nanoparticles (UCNPs). NaYF 4 :Yb/Er@NaLuF 4 :Nd/Yb@NaLuF 4 @CS@Ag 2 Se (labeled as UCNPs@CS@Ag 2 Se) nanocomposites can provide downshifting (DS) and upconversion (UC) luminescence in NIR biological window I and II under 808-nm continuous-wave laser excitation simultaneously. Meanwhile, the attached Ag 2 Se nanodots could produce hyperthermia and photoacoustic energy upon 808-nm laser irradiation due to its strong near-infrared (NIR) absorbance. Together with the X-ray absorbance feature of lanthanide components, the nanocomposites with excellent luminescent properties, high X-ray attenuation coefficient and strong NIR absorbance could be utilized as a smart contrast agent for upconversion luminescence (UCL)/downshifting luminescence (DSL)/computer tomography (CT)/photoacoustic (PA) multimodal imaging in vitro and in vivo . Furthermore, the as-synthesized nanocomposites possess superior photothermal performance, good biocompatibility, and negligible toxicity, showing great potential as an ideal photothermal therapy (PTT) agent. These outstanding properties revealed that UCNPs@CS@Ag 2 Se nanocomposites are promising theranostic agents for tetra-modal imaging-guided PTT of cancer.
研究领域:
生物医学工程
·
纳米医学
·
肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2021
·Vol. 14
·期 10
·3386-3394
·
IF 8.897
You Su,Zhang Li,Yang Qing
Broadband optoelectronic devices intrigue enormous interests on account of their promising potential in optical communications, sensors and environmental monitoring. PbSe nanocrystals are promising candidates for the construction of next-generation photodetectors due to their fascinating intrinsic properties and solution-processed compatibility with varied substrates. Here, we report the fabrication of a broadband photodetector on the basis of high-quality solution-processed PbSe nanorods in rock-salt phase grown along unconventionally anisotropic growth direction of <112> zone axis. The rock-salt PbSe nanorods are synthesized in solution phase over the catalysis of Ag 2 Se with relatively high-temperature body-centered cubic phase via a solution-solid-solid growth regime using oleylamine and oleic acid as solvents and stabilizer surfactants, from which the PbSe nanorods with the unconventionally anisotropic growth direction are controllably grown in size and shape in the synthetic procedure typically with about 17 nm in diameter and 58 nm in length on average. Meanwhile, the PbSe nanorods-based photodetector exhibits a broadband response from 405 to 1,064 nm with a high responsivity of 0.78 A·W −1 and a fast response time of 17.5 µs. The response time is much faster in comparison with most of the PbSe-based photodetectors with response time in millisecond level.
研究领域:
材料科学
·
光电探测器领域
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 39
·6899-6908
·
IF 3.545
Huimin Wang,Tingting Wang,Zibin Huang,Yizhuo Liu,Dehui Leng,Junli Wang
The growth of metal chalcogenide nanowires (NWs) on metal substrates is challenging work since the direct reactions taking place between the chalcogen (S, Se or Te) and zero-valent metal (M0) are frequently unable to regulate the crystallization of nanocrystals in an anisotropic one-dimensional (1D) manner. We here report the use of Ag2Se seeds as catalyst particles to realize the growth of metal selenide (MSe) NWs on their respective metal foil or flakes, including ZnSe/Zn, CdSe/Cd, and MnSe/Mn material systems. Metal foil or flakes (M = Zn, Cd and Mn) serve as a support substrate as well as a metal cation source during the NW synthesis. The preformed Ag2Se seeds play the roles of not only catalytic particles that initiate a so-called solution–solid–solid process to produce crystalline MSe NWs on metal substrates, but also inert impurities that promote an electrochemical anodic reaction of the metal to supply metal cations (M0 − 2e → M2+) for the NW formation. The microstructural studies by HRTEM reveal the polytypism and particularly the diameter-dependence of crystal phases and growth directions in the resulting MSe NWs, which can be rationalized from the viewpoints of the energetics and the catalyst/NW interfacial structures. These semiconductor NWs grown on metal foil or flakes may find wide use in photoelectric catalysis and devices without a transfer process of free-standing NWs onto a conductive support substrate.
研究领域:
材料科学
·
纳米技术
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 16
·11355-11366
·
IF 2.993
Tang Shilin,He Chuansheng,Li Dong,Cai Wenhao,Fan Louzhen,Li Yunchao
To obtain dual active near-infrared (NIR) nanomaterial with strong absorption and emission properties, we report herein a novel precursor reactivity differentiation strategy, i.e., utilizing 1-octadecene (ODE)–Se having the ability to react with Ag salts much stronger and faster than ODE–thiourea, for single-step preparation of Ag 2 Se@Ag 2 S nanocrystals (NCs). With this strategy, we were able to synthesize high-quality Ag 2 Se@Ag 2 S NCs with both excellent NIR absorption and emission properties. Particularly, these nanocrystals possess a rather strong and sharp excitonic absorption peak with a full width at half maximum less than 70 nm and a maximum fluorescence quantum yield as high as 24.3%. Their appealing optical properties and structural features were founded to be highly dependent on the Se to S precursor ratio in the reaction solutions, owing to such a ratio exerting a direct influence on the core sizes and shell thicknesses of the as-formed NCs. Taking advantage of their remarkable NIR absorption properties, self-powered photoelectrochemical-type photodetectors based on the as-prepared Ag 2 Se@Ag 2 S NCs were successfully fabricated, which demonstrate a much better response performance and photostability in comparison with those based on Ag 2 Se NCs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Gao Jie,Li Jiahui,Miao Lei,Jia Lida,Qiu Pengfei,Yin Tingwei,Zhu Sijing,Yang Xinyu,Guo Jia-Chen,Chen Jun-Liang,Wang Xiaoyang,Nishibori Eiji,Sato Tomohiro,Shi Xun
β -Ag 2 Se holds a great promise for wearable thermoelectric generators due to its good mechanical properties and biocompatibility. However, optimizing its power factor through alterations in the Ag/Se stoichiometric ratio or incorporating secondary phases has reached the limitation. This work adopts a liquid-like sintering strategy, namely employing the migration and precipitation of silver ions from metallic silver to the silver selenide during the spark plasma sintering process to construct significantly sized and coherent Ag-rich nanoprecipitates within flexible Ag/ β -Ag 2 Se composite films, thereby achieving an unprecedented power factor exceeding 4000 μWm −1 K −2 at 303 K. The Ag-rich nanoprecipitates play a crucial role in elevating the carrier concentration, enhancing the density-of-states effective mass, and mitigating carrier scattering caused by phase interfaces and acoustic phonons. The generator containing 5 pieces of optimal films shows an normalized output power density of 10.89 μWcm −1 K −2 under a temperature difference of 26.0 K. This study strongly suggests that the creation of Ag-rich nanoprecipitates is an effective avenue for improving the electrical performance of β -Ag 2 Se-based thermoelectric materials.
研究领域:
材料科学
·
纳米技术
·
热电材料
·
柔性电子学
·
能量转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）