排序方式: 共有193条查询结果,搜索用时 15 毫秒
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A Mussel‐Inspired Conductive,Self‐Adhesive,and Self‐Healable Tough Hydrogel as Cell Stimulators and Implantable Bioelectronics 下载免费PDF全文
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Immobilization of Pt Nanoparticles via Rapid and Reusable Electropolymerization of Dopamine on TiO2 Nanotube Arrays for Reversible SERS Substrates and Nonenzymatic Glucose Sensors 下载免费PDF全文
Jingsheng Cai Jianying Huang Mingzheng Ge James Iocozzia Zhiqun Lin Ke‐Qin Zhang Yuekun Lai 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(19)
Inspired by mussel‐adhesion phenomena in nature, polydopamine (PDA) coatings are a promising route to multifunctional platforms for decorating various materials. The typical self‐polymerization process of dopamine is time‐consuming and the coatings of PDA are not reusable. Herein, a reusable and time‐saving strategy for the electrochemical polymerization of dopamine (EPD) is reported. The PDA layer is deposited on vertically aligned TiO2 nanotube arrays (NTAs). Owing to the abundant catechol and amine groups in the PDA layer, uniform Pt nanoparticles (NPs) are deposited onto the TiO2 NTAs and can effectively prevent the recombination of electron–hole pairs generated from photo‐electrocatalysis and transfer the captured electrons to participate in the photo‐electrocatalytic reaction process. Compared with pristine TiO2 NTAs, the as‐prepared Pt@TiO2 NTA composites exhibit surface‐enhanced Raman scattering sensitivity for detecting rhodamine 6G and display excellent UV‐assisted self‐cleaning ability, and also show promise as a nonenzymatic glucose biosensor. Furthermore, the mussel‐inspired electropolymerization strategy and the fast EPD‐reduced nanoparticle decorating process presented herein can be readily extended to various functional substrates, such as conductive glass, metallic oxides, and semiconductors. It is the adaptation of the established PDA system for a selective, robust, and generalizable sensing system that is the emphasis of this work. 相似文献
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Fan Yang Mikel Abadia Chaoqiu Chen Weike Wang Le Li Lianbing Zhang Celia Rogero Andrey Chuvilin Mato Knez 《Nano Research》2017,10(1):97-107
The oxygen reduction reaction (ORR) is essential in research pertaining to life science and energy. In applications, platinum-based catalysts give ideal reactivity, but, in practice, are often subject to high costs and poor stability. Some cost-efficient transition metal oxides have exhibited excellent ORR reactivity, but the stability and durability of such alternative catalyst materials pose serious challenges. Here, we present a facile method to fabricate uniform Co x O y nanoparticles and embed them into N-doped carbon, which results in a composite of extraordinary stability and durability, while maintaining its high reactivity. The half-wave potential shows a negative shift of only 21 mV after 10,000 cycles, only one third of that observed for Pt/C (63 mV). Furthermore, after 100,000 s testing at a constant potential, the current decreases by only 17%, significantly less than for Pt/C (35%). The exceptional stability and durability results from the system architecture, which comprises a thin carbon shell that prevents agglomeration of the Co x O y nanoparticles and their detaching from the substrate. 相似文献
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以丁香酚(EO)为芯材,多巴胺(DA)为壳材,通过乳液模板-界面聚合法成功制备出尺寸可控的聚多巴胺丁香酚(PDA@EO)微胶囊。通过FTIR、TG、UV-Vis、SEM和TEM对微胶囊的化学结构、形貌、粒径及性能进行表征和分析,结果表明,所制备的微胶囊呈规整球形,粒径在55~94 nm之间,丁香酚包封率为25.35%,包封量为0.6288 g/g,24 h时累积释放率达到68.39%。通过对比实验证明,PDA@EO微胶囊在不同材料表面均具有优异的黏附性能;作用于口腔感染部位常见细菌金黄色葡萄球菌和大肠杆菌24 h,PDA@EO微胶囊较游离丁香酚的抑菌活性分别提高了36.84%和35.52%;当微胶囊质量浓度达到2.0 g/L时,PDA@EO微胶囊对两种细菌的抑菌活性均达到99%以上。 相似文献
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PDA包覆铝粉及其在HTPB中的分散稳定性 总被引:1,自引:0,他引:1
通过原位多巴胺(DA)聚合法在铝粉表面包覆聚多巴胺(PDA),制备了Al@PDA复合颗粒;采用SEM表征不同DA质量浓度下Al@PDA的表面形貌。用XRD测试铝粉包覆前后的晶型;采用XPS分析Al@PDA的表面元素组成;通过沉降法研究了铝粉和Al@PDA在HTPB中的分散稳定性;通过制备固化胶并切片取样观察固体颗粒在HTPB中的分散情况。结果表明,当DA质量浓度为3.5g/L时对铝粉的包覆效果最好,在铝粉表面形成牢固的PDA薄膜;包覆前后Al的晶型没有改变;XPS在Al@PDA表面检测到的C-OH、C=O组分和π-π共轭结构证实了PDA包覆层的存在。沉降24h后Al-HTPB体系出现分层,而Al@PDA-HTPB体系仍然颜色均一,表明Al@PDA在HTPB中的分散稳定性明显优于原料铝粉。 相似文献
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首先制备普鲁士蓝纳米粒子(PB),通过利用多巴胺(DA)自氧化聚合形成聚多巴胺膜(Dopa)的特性,在PB纳米粒子表面包覆成膜,有效增加PB的稳定性,并在氯金酸溶液中原位还原沉积金纳米粒子,利用纳米金固定化甲胎蛋白抗体(anti-AFP),制得灵敏度高和稳定性好的无标记免疫传感器。采用透射电子显微镜(TEM)对纳米粒子进行表征,采用循环伏安法(CV)和交流阻抗法(EIS)考察修饰电极的电化学特性,实验结果表明,PB-Dopa-Au纳米粒子修饰的电极在实验过程中呈现出良好的氧化还原活性,对甲胎蛋白的检测范围为0.02~80 ng/mL检出限为0.01ng/mL。 相似文献
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UV‐Triggered Polydopamine Secondary Modification: Fast Deposition and Removal of Metal Nanoparticles
Yi Zeng Xin Du Wei Hou Xiaojiang Liu Cun Zhu Bingbing Gao Liangdong Sun Qiwei Li Junlong Liao Pavel A. Levkin Zhongze Gu 《Advanced functional materials》2019,29(34)
Since the first report in 2007, polydopamine (PDA) coating has shown great potential as a general and versatile method to create functional nanocoatings on arbitrary substrates. Slow kinetics and poor controllability of the coating and secondary modification processes, however, have limited the further development of this attractive method. In this work, it is demonstrated that UV irradiation at 365 nm significantly accelerates the process of secondary modification of a PDA‐coated surface. The kinetics of both thiol and amine modifications of PDA are increased 12‐fold via UV irradiation, while the kinetics of metal ion reduction at the PDA interface is increased more than 550 times. Moreover, it is demonstrated that irradiating a PDA/metal nanoparticle composite surface with UV light at 254 nm leads to dissolution of the deposited metal nanoparticles (MNPs). Finally, grayscale metallic patterns, dynamic deposition, and removal of MNPs on PDA surface are realized with the proposed method. 相似文献