SUPERLATTICES AND MICROSTRUCTURES
·
2016
·
IF 2.117
Jingni Wang,Kai Yao,Zhenrong Jia,Xiaofeng Wang,Fan Li
Microstructure control is critical to achieve thin film-based devices with high performance. The surface properties of the substrates on which thin films grow are expected to greatly influence the morphology and the resulting performance. Generally, homogeneous, dense and highly crystalline films are required. However, “island” like structures are usually obtained mainly due to the non-uniform nucleation. In this article, the self-assembling monolayer (SAM) strategy was applied to efficiently realize the uniform nucleation and modulate the microstructure of lead sulfide (PbS) thin films, which were fabricated on the modified ZnO-coated substrates with 3-mercaptopropionic acid (MPA) SAM via in-situ thermal decomposition of lead xanthate precursors. The results showed that PbS thin films with reduced pin-holes and uniform crystalline grains were fabricated with the incorporation of MPA SAM. More importantly, PbS thin films modulated by MPA showed better photoelectric response.
研究领域:
材料科学
·
薄膜技术
·
纳米材料
·
半导体器件
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Xue-Hui Shi,Leiming Tao,Lei Wang,Xing Liu,Shu-Lin Liu,Zhi-Gang Wang
In recent years, the application of both fluorescence and photothermal systems in one system has received great attention in the biomedical field. Yet, synthesizing a nanomaterial with both fluorescence (radiative decay) and a photothermal effect (nonradiative decay) is rarely reported. Here, we proposed novel plasmonic-fluorescent Janus Au-PbS nanoparticles (NPs) with tunable near-infrared II (NIR-II) fluorescence and photothermal effect to be used as a highly effective nanotheranostic for dual-modal NIR-IIb fluorescence imaging (FI)/computed tomography imaging (CT)-guided photothermal therapy. In addition, we investigated the equilibrium mechanism between the fluorescence and photothermal effects to guide the synthesis of this type of nanomaterial and found that the fluorescent semiconductor PbS quantum dots (QDs) receive electrons from Au NPs in Janus Au-PbS NPs, which could maintain the good fluorescence properties of Janus Au-PbS NPs. In addition, the alteration of electron and hole recombination between PbS QDs and Au NPs in Janus Au-PbS NPs increased nonradiative decay, leading to enhanced photothermal effects of Janus Au-PbS NPs. The electron receiver and electron–hole interactions in Janus Au-PbS NPs offered a fundamentally new means of engineering materials with fluorescence and photothermal properties through tailoring electron redistribution in Janus NPs.
研究领域:
生物医学工程
·
材料科学
·
肿瘤学
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产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2015
·Vol. 17
·期 3
·1-15
·
IF 2.184
Liu Yingbo,Li Zhen,Yu Libo,Sun Shuqing
In this work, the influences of cationic precursors on the quality of photoelectrode, consequently on the performance of the quantum dot-sensitized solar cells (QDSCs) have been studied. CdS QDSCs have been prepared using successive ionic layer absorption and reaction (SILAR) method. Three cadmium precursors including nitrate (Cd(NO 3 ) 2 ), chloride (CdCl 2 ), and acetate (Cd(Ac) 2 ) were employed for the synthesis and absorption of CdS nanoparticles on nanostructure TiO 2 film. The loading amount and nanoparticle size of the CdS on mesoporous TiO 2 film showed a significant difference while using various cadmium precursors in the same SILAR cycles. Both the light-harvesting ability and the obtained incident photon-to-current conversion efficiency values show the trend of deposition rate caused by cadmium precursors. Further, it was proposed that an effective cationic precursor could provide a good connection between QD sensitizer and TiO 2 interface by electrochemical impedance spectroscopy analysis. Under AM 1.5 G full one sun illumination, the final power conversion efficiency of CdS QDSC based on Cd(Ac) 2 was 2.10 %, and PCE values of 1.57 and 1.20 % were obtained for solar cells sensitized by CdS QDs prepared by CdCl 2 and Cd(NO 3 ) 2 , respectively. The cationic precursor effect was further applied in PbS/CdS co-sensitized solar cells. The PbS/CdS QDSCs based on acetate cationic precursors provide a photocurrent of 19.24 mA/cm 2 and PCE of 3.23 % in comparison with 11.26 mA and 2.13 % obtained with nitrate acetate salts. Noticeably, the CdS and PbS/CdS QDSCs based on various cationic precursors prepared by SILAR exhibited good photocurrent stability under several light on–off cycles.
研究领域:
材料科学
·
纳米技术
·
能源研究
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Tianbo Zhou,Xueshuai Wang,Yi Liu,Liuchun Zheng
The conventional direct esterification and polycondensation is difficult to obtain kilogram scale of poly(butylene succinate) (PBS) ionomers with both high molecular weight and high ionic group content. Therefore, the investigation of relationship between the content of ion group and performance (such as mechanical properties) is impossible. In this work, the preparation of PBS ionomers with high molecular weight and high ion group content was achieved by transesterification method using sodium dimethyl isophthalate-5-sulfonate (SIPM) as the ionic monomer, and the polycondensation time decreased significantly with the increase of SIPM content. The mechanism of reducing the polycondensation time of PBS prepared by transesterification is proposed. The tensile strength, flexural strength and impact strength of PBS ionomers increased significantly with increasing SIPM content. At high ion group content, the formed multiplets-clusters among ion groups, which act as reversible physical crosslinking points and nano-fillers, substantially improved the mechanical properties. The tensile strength, flexural strength and impact strength improved and reached to 50.1 MPa, 40.9 MPa and 13.1 kJ/m 2 at high ion group content from 34.2 MPa, 24.1 MPa and 5.8 kJ/m 2 for PBS, respectively. It showed a totally opposite trend from the previous research. In addition, the hydrophilicity and processing properties of PBS ionomers improved significantly with the increase of the ion group content, and the contact angle reduced to 41.1° after the introduction of ions.
研究领域:
材料科学
·
绿色化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hui Li,Zhong Du,Lijun Zhu,Chi Zhang,Jiabao Xiong,Bingshuai Zhou,Biao Dong,Xueliang Zhang,Nuernisha Alifu
Pioneering approaches for precise tumor removal involve fluorescence-guided surgery, while challenges persist, including the low fluorescence contrast observed at tumor boundaries and the potential for excessive damage to normal tissue at the edges. Lead/cadmium sulfide quantum dots (PbS@CdS QDs), boasting high quantum yields (QYs) and vivid fluorescence, have facilitated advancements in the second near-infrared window (NIR-II, 900–1700 nm). However, during fluorescent surgical navigation operations, hydrophilic coatings of these inorganic nanoparticles (NPs) guarantee biosafety; it also comes at the expense of losing a significant portion of QY and NIR-II fluorescence, causing heightened damage to normal tissues caused by cutting edges. Herein, we present hydrophilic core–shell PbS@CdS@PEG NPs with an exceptionally small diameter (∼8 nm) and a brilliant NIR-IIb (1500–1700 nm) emission at approximately 1600 nm. The mPEG-SH (MW: 2000) addresses the hydrophobicity and enhances the biosafety of PbS@CdS QDs. In vivo fluorescence-guided cervical tumor resection becomes achievable immediately upon injection of an aqueous solution of PbS@CdS@PEG NPs. Notably, this approach results in a significantly reduced thickness (100–500 μm) of damage to normal tissues at the margins of the resected tumors. With a high QY (∼30.2%) and robust resistance to photobleaching, NIR-IIb imaging is sustained throughout the imaging process.
研究领域:
生物医学工程
·
纳米技术
·
癌症研究
·
医学成像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Microfluidics and Nanofluidics
·
2016
·Vol. 20
·期 9
·1-13
·
IF 2.537
Xu Wenchao,Hou Zining,Liu Zhenhua,Wu Zhigang
We developed a new approach for particle separation by introducing viscosity difference of the sheath flows to form an asymmetric focusing of sample particle flow. This approach relies on the high-velocity gradient in the asymmetric focusing of the particle flow to generate a lift force, which plays a dominated role in the particle separation. The larger particles migrate away from the original streamline to the side of the higher relative velocity, while the smaller particles remain close to the streamline. Under high-viscosity (glycerol–water solution) and low-viscosity (PBS) sheath flows, a significant large stroke separation between the smaller (1.0 μm) and larger (9.9 μm) particles was achieved in a sample microfluidic device. We demonstrate that the flow rate and the viscosity difference of the sheath flows have an impact on the interval distance of the particle separation that affects the collected purity and on the focusing distribution of the smaller particles that affects the collected concentration. The interval distance of 293 μm (relative to the channel width: 0.281) and the focusing distribution of 112 μm (relative to the channel width: 0.107) were obtained in the 1042-μm-width separation area of the device. This separation method proposed in our work can potentially be applied to biological and medical applications due to the wide interval distance and the narrow focusing distribution of the particle separation, by easy manufacturing in a simple device.
研究领域:
微流控技术
·
生物医学工程
·
粒子分离
·
流体力学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Materials and Technologies
·
2024
·
IF 8.6
Cui Li,Yu Long,Yuanmeng Lou,Xuan Huo,Lili Ma,Yanan Tang,Chuncheng Hao,Xin Wen
As one typically sustainable polymer material, poly(butylene succinate) (PBS) is highly necessary to improve its flame retardancy and simultaneously maintain satisfied mechanical performances. In this study, “three-in-one” novel flame retardant was synthesized through grafting organophosphorus onto Fe-MOF functionalized Mg(OH) 2 (labeled as MH@Fe-MOF-P), then it was introduced into PBS matrix to investigate its effect on flame retardancy and mechanical properties. The results indicated that PBS/20MH@Fe-MOF-P exhibited excellent flame retardancy, including that the LOI was 29.6%, the UL-94 rating reached to V0, and the peak of heat release rate (PHRR) decreased by 82.1%. The flame retardant mechanism was ascribed to the synergistic effect of Mg(OH) 2 , Fe-MOF and organophosphorus on delaying the decomposition and catalyzing the carbonization of PBS. Meanwhile, PBS/20MH@Fe-MOF-P presented better mechanical performances than PBS/20MH and PBS/20MH@Fe-MOF composites, resulting from the special structure of MH@Fe-MOF-P to achieve good dispersion of fillers and strong polymer-filler interface adhesion. This work provides a novel strategy to modify Mg(OH) 2 with high flame retardant efficiency, and also broadens the practical applications of PBS materials with balanced comprehensive performances.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Zhonghui Gu,Jiangang Zhang,Wen Cao,Xiong Liu,Jiashun Wang,Xianming Zhang,Wenxing Chen,Jianna Bao
Simultaneously improving the toughness and heat resistance of poly( l -lactide) (PLLA) is significant for expanding biodegradable materials' application range. In this work, reactive compatibilizers containing PBS and PLLA (PBS-St-GMA-PLLA (SGL)) or poly( d -lactide) (PBS-St-GMA-PDLA (SGD)) were synthesized and incorporated in blends of commercial PLLA and PBS as compatibilizers. The in situ formation of stereocomplex (SC) crystallites of PLA at the interface of PLLA and PBS was successfully achieved through simple melt blending. The effects of SC crystallites, amount of compatibilizers on morphology, crystallization behavior , mechanical properties , heat resistance and degradability properties of PLLA/PBS blends were studied. Morphological evolution showed that SGL and SGD significantly improved the compatibility of PLLA/PBS blends. After incorporating 5% SGD, the elongation at break and notched impact strength of PLLA/PBS blends with SC crystallites reached 273% and 34 kJ/m 2 , respectively, 12 and 5 times than that of pristine PLLA/PBS blends. As compared with PLLA/PBS/SGL blends that cannot form SC crystallites, the tensile strength of the blends was effectively improved by the presence of SC crystallites, ascribing to improved interfacial compatibility and remarkable acceleration in matrix crystallization kinetics of PLLA. Consequently, the blends containing 5% SGD exhibited excellent heat resistance ( E′ 80°C > 680 MPa) after brief annealing, which far exceeded the PLLA or PLLA/PBS blends. This work may provide a feasible way to prepare PLLA-based materials with excellent comprehensive properties by the formation of SC crystallites.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 48
·2408686
·
IF 18.5
Chuanzhou Han,Jiankang Du,Zhiyang Liu,Qiaojiao Gao,Xiayan Chen,Junwei Xiang,Xufeng Xiao,Yanjie Cheng,Kai Chen,Minghao Xia,Jiale Liu,Li-Ming Yang,Yang Zhou,Anyi Mei,Hongwei Han
Perovskite solar cells are regarded as the most promising and disruptive photovoltaic of the new generation. Carbon-based hole-conductor-free printable mesoscopic perovskite solar cells (p-MPSCs) with three mesoscopic layers have garnered considerable interest owing to their simple manufacturing process and cost-effective raw materials, signaling the potential for commercialization. However, the energy level mismatch between the perovskite and the carbon electrode as well as defects at perovskite grain boundaries inevitably lead to additional non-radiative carrier recombination and large voltage loss. In this study, a facile in situ reconstruction post-treatment approach is employed to integrate lead sulfide (PbS) and the two-dimensional (2D) perovskite K 2 PbI 4 into the mesoporous scaffolds of p-MPSCs. In this way, grain boundary defects are effectively passivated and the ion migration is suppressed by introducing 2D perovskite K 2 PbI 4 at grain boundaries. Besides, the incorporation of PbS leads to the downward shift of the Fermi level for perovskite, which enhances hole collection within the device by optimizing band alignment at the perovskite/carbon interface. Consequently, an improved efficiency exceeding 20% is achieved for p-MPSCs with no significant performance degradation observed over a storage period of 235 days. This strategy provides a facile and novel approach toward fabricating highly efficient and stable p-MPSCs.
研究领域:
材料科学
·
光伏技术
·
能源材料
·
太阳能
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Lu Wan,Liangliang Lu,Hongsen Zhu,Xuejiao Liang,Zhichang Liu,Xinxin Huang,Qiong Luo,Qiang Xu,Qiuhong Zhang,Xudong Jia
Biodegradable electronic devices have gained significant traction in modern medical applications. These devices are generally desired to have a long enough working lifetime for stable operation and allow for active control over their degradation rates after usage. However, current biodegradable materials used as encapsulations or substrates for these devices are challenging to meet the two requirements due to the constraints of inadequate water resistance, poor mechanical properties, and passive degradation characteristics. Herein, we develop a novel biodegradable elastomer named POC-SS-Res by introducing disulfide linkage and resveratrol (Res) into poly(1,8-octanediol-co-citrate) (POC). Compared to POC, POC-SS-Res exhibits good water resistance and excellent mechanical properties in PBS, providing effective protection for devices. At the same time, POC-SS-Res offers the unique advantage of an active-controllable degradation rate, and its degradation products express low biotoxicity. Good biocompatibility of POC-SS-Res is also demonstrated. Bioelectronic components encapsulated with POC-SS-Res have an obvious prolongation of working lifetime in PBS compared to that encapsulated with POC, and its degradation rate can be actively controlled by the addition of glutathione (GSH).
研究领域:
材料科学
·
生物医学工程
·
生物材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2025
·
IF 4.5
Bo Wen,Gaopeng Wang,Renze Xu,Chenglong Weng,Jintao Yang
With the growing global emphasis on environmental protection, supercritical CO 2 foaming technology for biodegradable materials such as polylactic acid (PLA), poly(butylene adipate-co-terephthalate) (PBAT), poly (butylene succinate) (PBS) and their blends has emerged as a research and application hotspot. However, the low melt strength and poor compatibility of these polymers often lead to low nucleation efficiency, cell wall rupture and coalescence, exhibiting inferior foaming performance. In this work, aiming to enhance the foamability of PLA and PLA/PBAT blends, a fluorinated chain extender, F-CE (GMA-co-DFHA-co-MMA), was designed and synthesized. Through the reactive melt blending, F-CE effectively enhanced the melt strength of PLA and interfacial adhesion between PLA and PBAT, leading to a significant improvement in foaming performance. Additionally, the fluorine groups in DFHA demonstrated high affinity for CO 2 , providing additional heterogeneous nucleation sites for bubble formation, thereby increasing both foam expansion ratio and cell density. Notably, the F-CE/PLA foam exhibited a cell diameter of ∼13.8 μm with an exceptionally high expansion ratio of ∼35. As a contrast, pristine PLA foam shows an expansion ratio of ∼30, but with large cell diameter (∼118 μm). Although PLA foam containing CE without fluorine (CE/PLA foam) exhibits small cells with an average cell diameter of ∼13.6 μm, the expansion ratio is low (∼23). In addition, F-CE also exhibits superior performance in improving the foamability of PLA/PBAT blends. This work presents a chain extender specifically engineered for foaming applications, which functions as a highly efficient foaming additive to holistically enhance the foaming performance of polymers.
研究领域:
高分子科学
·
材料工程
·
绿色化学
·
发泡技术
·
超临界流体加工
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Zong-Xian Zhu,Xuan Zhang
In this work, a novel ratiometric electrochemical sensor for bisphenol A (BPA) detection was facilely constructed by coupling conductive carbon black (VXC-72R) with ferricyanide probe. The VXC-72R was decorated with nonionic surfactant Tween to enhance the sensitivity and coated on glassy carbon electrode (GCE), whereas K 3 [Fe(CN) 6 ] was introduced into electrolyte solution as an internal reference probe to realize dual-signal outputs. The present ratiometric electrochemical sensor achieved a highly sensitive and selective detection of BPA in PBS solution (pH = 7.0), with a linear range of 0.08–40.0 μM and detection limit of 0.05 μM. Moreover, it has been successfully applied to the determination of BPA in real lake water and milk samples with the satisfactory recoveries rates of 94.8–102.3 %.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 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）