RSC Advances
·
2013
·Vol. 3
·期 45
·23178-23183
·
IF 2.562
Rui Zhao,Xiaodan Zhang,Jiping Xu,Yang Yang,Gaohong He
Different from most ionic diodes which use water as the medium, in this paper, we reported flexible solid state ionic diodes without water during the fabrication and operation. The ionic diodes were fabricated by sandwiching a PEO-doped separator sheet between two paper sheets, respectively doped with AgNO3–polyethylene oxide (PEO) and KI–PEO electrolyte. The working mechanism of the solid diodes was based on the different electrochemical and participation reactions under different bias. The rectification ratio of the diode devices could reach 46 under an input AC voltage between ±1 V. The devices exhibited good flexibility and showed stable rectifying behavior after more than 800 bending cycles. The effects of plasticizer on the rectifying performances of diodes were systematically studied. The stability of the devices fabricated with or without plasticizer in PEO was investigated. The results showed that there was a trade-off between rectifying performance and stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Weijia Ren,Houchao Jing,Shengyong Ding,Junyan Dan,Zhijun Xu,Tongkun Guo,Hua Wei,Yue Liu,Yaqing Liu
Ionic diodes with environmentally modulated ion-rectifying characteristics have attracted much attention and show great promise in the construction of smart devices with environmental adaptability. One immediate challenge is to integrate stimuli responsiveness and ion rectification into one single ionic diode, which requires a close cooperation of chemical principles and device technologies. Herein, an ionic diode based on a photoresponsive hydrogel with optically mediated ion-rectifying performances is introduced. Relying on the photoresponsive concentration of proton in the hydrogel, the ionic current rectification can be prominently enhanced upon ultraviolet (UV) irradiation. A maximum ionic current rectification ratio of the optically mediated ionic diode about 4 × 10 5 is achieved. Furthermore, the hydrogel-based diode can serve as an AND logic gate operated by UV light and voltage bias as two independent inputs. As a proof of concept, to use the optically mediated diode is achieved to modulate the feedback of a robot with logic behaviors. This work provides a novel and valuable strategy for designing functional hydrogel-based devices with the integration of stimuli-responsiveness and logic signal processing through chemical approaches.
研究领域:
材料科学
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化学工程
·
生物医学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yuan-Ju Tang,Shu-Jie Zhang,Zi-Tao Zhong,Bin Zhang,Wen-Ming Su,Guo-Ping Wang,Yuan-Di Zhao
The construction of porous ion channels with ion current rectification (ICR) at the submicron scale has great significance for the development of large-area bionic ion channel devices. In this manuscript, one kind of heterogeneous membrane with asymmetric composition, geometry and wettability was prepared by simple drop-coating of the neutral hydrophobic conducting polymer precursor and in-situ thermal polymerization on cylindrical submicron scale anodic aluminum oxide channels (D≈269 nm) at 150 °C. ICR in the submicrochannel heterogeneous membrane was successfully achieved due to the asymmetric charge distribution induced by asymmetric pH gradient. Furthermore, the rectification ratio ( R ic : 1.6 ∼ 42.8) could be effectively regulated by multiple drop-coating, the electrolyte concentration (0.01 mM ∼ 1 M) and pH gradient (3 ∼ 11). Finally, through the permeation experiment of anionic dye and cationic dye, the mechanism of the synergistic effect of surface charge and electrophoresis on the ion selectivity and ICR was discussed, and it was successfully applied to the directional and on-demand transport of anionic and cationic ions under the regulation of pH gradient and voltage driving. It has important potential applications in the treatment of pollutants, the purification of water and energy conversion etc.
研究领域:
生物物理学
·
材料科学
·
仿生学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Tingting Zhang,Haoyu Bai,Yunliang Zhao,Bo Ren,Tong Wen,Licai Chen,Shaoxian Song,Sridhar Komarneni
Various kinds of clays occur naturally and are accompanied by particular cations in their interlayer domains. Here we report the reassembled membranes with nanofluidic channel arrays by using the natural clays montmorillonite, mica, and vermiculite, which were imparted with the natural selectivity for realizing precise recognition and directional regulation of the naturally occurring interlayer cations. A typical surface-governed ionic transport behavior was observed in the clay nanofluidic channels. Through asymmetric structural modification, cationic current rectification was realized in montmorillonite channels that performed as a nanofluidic diode. Interestingly, in the mica nanofluidic channel, the K+ that was naturally occurring in the interlayer domain of mica showed a reciprocating motion and resulted in a periodically fluctuating current. Electrodialysis demonstrated that such a fluctuating current reflects a directional selectivity for K+, achieving at least a 6000 times permeation rate difference with Li+ ions. The specific selectivity for Li+/Mg2+ on vermiculite reached up to 856 times with similar cations by the current technique. As-obtained clay membranes possess application prospects in energy conversion, brine resource development, etc. Such a strategy can achieve the designed selectivity through systematic screening of the building blocks, thus imparting them with the inherent characteristics of natural clays, which provides an alternative solution to the present manufacture of selective membranes.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2020
·
IF 14.588
Weiqing Yang,Lili Lv,Xiankai Li,Xiao Han,Mingjie Li,Chaoxu Li
Protein nanostructures in living organisms have attracted intense interests in biology and material science owing to their intriguing abilities to harness ion transportation for matter/signal transduction and bioelectricity generation. Silk nanofibrils, serving as the fundamental building blocks for silk, not only have the advantages of natural abundance, low cost, biocompatibility, sustainability, and degradability but also play a key role in mechanical toughness and biological functions of silk fibers. Herein, cationic silk nanofibrils (SilkNFs), with an ultrathin thickness of ∼4 nm and a high aspect ratio up to 500, were successfully exfoliated from natural cocoon fibers via quaternization followed by mechanical homogenization. Being positively charged in a wide pH range of 2–12, these cationic SilkNFs could combine with different types of negatively charged biological nanofibrils to produce asymmetric ionic membranes and aerogels that have the ability to tune ion translocation. The asymmetric ionic aerogels could create an electric potential as high as 120 mV in humid ambient air, whereas asymmetric ionic membranes could be used in ionic rectification with a rectification ratio of 5.2. Therefore, this green exfoliation of cationic SilkNFs may provide a biological platform of nanomaterials for applications as diverse as ion electronics, renewable energy, and sustainable nanotechnology.
研究领域:
材料科学
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生物物理学
·
可持续技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2018
·
IF 4.244
Fengxia Chang,Yang Yang,Xia Xie,Meixian Li,Zhiwei Zhu
The modification of inner surface has significant influence in the properties of the nano or microchannel based on various materials, especially for the ionic current rectification (ICR) that arises from the selective interaction between ions in solution and the inner surface. Herein, we demonstrate a simple strategy to asymmetrically modify the inner wall of a glassy biconical microchannel with silver , copper or gold by means of silver mirror reaction and polydopamine platform, respectively. And the bidirectional ionic current rectification phenomena were observed in all of the modified biconical microchannels. All of the modification methods are simple, facile and low-cost, and can be applied in the modification of other glassy pipettes.
研究领域:
材料科学
·
生物物理
✓ 已验证
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Shouwei Zhang,Liu Yang,Dong Ding,Pengcheng Gao,Fan Xia,Merlin L. Bruening
Nanochannel-based fluidic diodes display ion selectivity and ion current rectification (ICR), which may prove to be important in energy-harvesting devices and biosensors. This paper reports asymmetric functionalization of the outer surface of a flexible nanochannel polymer membrane to create fluidic diodes that give ICR. Layer-by-layer (LbL) adsorption with cross-linking of only the underlying part of the polyelectrolyte nanofilm leads to a porosity step across the film. The combination of a high effective surface charge density and the porosity step in the film leads to a remarkable maximum ICR factor of ∼200 with a pH gradient across the film. Incorporation of pH-sensitive polyelectrolyte components enables the ICR factor to increase an order of magnitude on going from pH 8 to pH 3. Moreover, the coated membrane shows excellent anion selectivity. Thus, LbL adsorption with partial cross-linking provides a simple method for creating coated nanochannel membranes that serve as pH-responsive ionic diodes for potential chemical/biosensors.
研究领域:
生物工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Wenrui Ma,Lulu Liu,Zhuoya Jiang,Chaoshan Zhao,Zilan Lv,Yuping Yang,Yi Xu,Li Wang,Li Chen,Shunbo Li
Background MicroRNAs, as oncogenes or tumor suppressors, enable to up or down-regulate gene expression during tumorigenesis. The detection of miRNAs with high sensitivity is crucial for the early diagnosis of cancer. Inspired by biological ion channels, artificial nanochannels are considered as an excellent biosensing platform with relatively high sensitivity and stability. The current nanochannel biosensors are mainly based on homogeneous membranes, and their monotonous structure and functionality limit its further development. Therefore, it is necessary to develop a heterostructured nanochannel with high ionic current rectification to achieve highly sensitive miRNA detection. Results In this work, an asymmetric heterostructured nanochannel constructed from dendrimer-gold nanoparticles network and anodic aluminum oxide are designed through an interfacial super-assembly method, which can regulate ion transport and achieve sensitive detection of target miRNA. The symmetry breaking is demonstrated to endow the heterostructured nanochannels with an outstanding ionic current rectification performance. Arising from the change of surface charges in the nanochannels triggered by DNA cascade signal amplification in solution, the proposed heterogeneous nanochannels exhibits excellent DNA-regulated ionic current response. Relying on the nucleic acid's hybridization and configuration transformation, the target miRNA-122 associated with liver cancer can be indirectly quantified with a detection limit of 1 fM and a wide dynamic range from 1 fM to 10 pM. The correlation fitting coefficient R2 of the calibration curve can reach to 0.996. The experimental results show that the method has a good recovery rate (98%–105 %) in synthetic samples. Significance This study reveals how the surface charge density of nanochannels regulate the ionic current response in the heterostructured nanochannels. The designed heterogeneous nanochannels not only possess high ionic current rectification property, but also enable to induce superior transport performance by the variation of surface chemistry. The proposed biosensor is promising for applications in early diagnosis of cancers, life science research, and single-entity electrochemical detection.
研究领域:
生物传感器技术
·
分子生物学
·
纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Lei Sun,Lin Zhou,Fei Yan,Bin Su
In this work, a silica nanochannel membrane (SNM) consisting of a high density of vertically aligned channels on an indium tin oxide (ITO) electrode surface was used as a stencil to confine the grafting of ferrocene (Fc) via electrochemical reduction of diazonium cations. The grafting selectively occurs on the underlying ITO surface (namely, the bottom of silica nanochannels) instead of on the nanochannel walls. Thus, the obtained electrode, designated as Fc@SNM/ITO, is composed of an array of silica nanochannels with redox activity on the bottom. Immobilized Fc molecules are able to rectify the electron transfer between the underlying ITO electrode and soluble redox species. In other words, they can promote the electron transfer in one direction while suppressing that in the opposite direction. Anodic and cathodic redox rectification was observed for Fe(CN)64– and IrCl62–, respectively, with the magnitude of current rectification directly proportional to the concentration of redox species. Moreover, because of strong permselectivity of silica nanochannels arising from their ultrasmall size (2–3 nm in diameter) and negatively charged surface (due to deprotonation of surface silanol groups), the access of Fe(CN)64– and IrCl62– to nanochannels strongly depends on the ionic strength of electrolyte solution. A higher ionic strength favors the access of anionic redox species, thus leading to a larger redox current rectification. The redox current rectification phenomenon not only proves the permselective nature of silica nanochannels but also holds potential for the development of electrochemical current rectification-based sensors.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2023
·
IF 12.6
Xia Qiu,Jingyi Dong,Qingshan Dai,Mimi Huang,Yongxin Li
Enzyme-free hybridization chain reaction (HCR) technology is often used as a signal amplification tool for the detection of different targets. In this study, an ultrasensitive and label-free method for detecting miRNA-21 was developed using the nanopore ionic current rectification (ICR) technology coupled with HCR technology. The probe oligonucleotide (DNA1) was combined with the gold-coated nanopore through the Au–S bond to form a DNA1-functionalized gold-coated nanopore (DNA1-Au-coated nanopore). Since miRNA-21 is partially complementary to DNA1, it can be selectively recognized by DNA1-functionalized gold-coated nanopores. The target (miRNA-21) can induce the opening of hairpin DNA and HCR reaction after the introduction of hairpin DNA H1 and H2. The concentration of miRNA-21 will affect the combination of H1 and H2 on the inner wall of the nanopore, and its surface charge will change with the internal modification, thereby changing the ion current rectification ratio . Under the condition that the concentration of H1, H2 and HCR reaction time are constant, the change of ICR ratio is linearly correlated with the logarithm of miRNA-21 concentration within a certain range, which shows that the sensing strategy we designed can achieve target miRNA-21 detection. This ultrasensitive miRNA holds great promise in the field of cancer diagnosis.
研究领域:
生物化学
·
分子生物学
·
纳米技术
·
医学诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 12
·2933-2939
·
IF 4.696
Li Wang,Hong-Wei Song,Zhen-Xing Liu,Xu Ma,Ran Chen,Yong-Qiang Yu,Chun-Yan Wu,Ji-Gang Hu,Yan Zhang,Qiang Li,Lin-Bao Luo
In this study, we reported on the construction of p–n junctions based on crystalline Ga-doped CdS–polycrystalline ZnTe nanostructures (NSs) for optoelectronic device application. The coaxial nano-heterojunction was fabricated by a two-step growth method. It is found that the absorption edge of CdS:Ga–ZnTe:Sb core–shell NSs red shifted to about 580 nm, compared with CdS nanowires (520 nm). The as-fabricated core–shell p–n junction exhibited obvious rectification characteristics with a low turn-on voltage of ∼0.25 V. What is more, it showed stable and repeatable photoresponse to 638 nm light illumination, with a responsivity and a detectivity of 1.55 × 103 A W−1 and 8.7 × 1013 cm Hz1/2 W−1, respectively, much higher than other photodetectors with similar device configurations. The generality of this study suggests that the present coaxial CdS:Ga–ZnTe:Sb core–shell nano-heterojunction will have great potential applications in future nano-optoelectronic devices.
研究领域:
纳米材料科学
·
光电设备工程
·
半导体物理
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 43
·16388-16396
·
IF 8.067
Wenrui Ma,Lulu Liu,Xu Zhang,Xingfei Liu,Yi Xu,Shunbo Li,Muling Zeng
Artificial membranes with asymmetric nanopores are similar to biological membranes with ion channels. The selective and rectified ion transport property of artificial membranes is of great significance for developing electrochemical sensors with highly sensitive detection performance. Herein, we propose a fast and facile approach for the sensitive detection of metal ions or charged molecules by constructing an asymmetric nanochannel structure using a cation-selective Nafion membrane and a DNA-functionalized anodic aluminum oxide (AAO) membrane. Arising from the varying charge distributions induced by the recognition of targets by DNA probes, the Nafion/AAO heterostructured nanochannels exhibit high ionic current rectification and excellent Hg2+ regulated current responses. The present sensor with heterostructured nanochannels can realize the detection of Hg2+ with a low detection limit of 1 pM, due to the unique ionic transport property of asymmetric nanochannels and the sensitive electrochemical detection method. The sensing mechanism is also confirmed by numerical simulations, demonstrating that the differences in the rectification ratios in the heterostructured nanochannels are caused by the varying surface charge densities in AAO nanochannels. This simple and facile heterostructured sensor has the advantages of simple preparation, easy modification, simple instrumentation and high sensitivity, which possesses great potential in the detection of metal ions or charged molecules.
研究领域:
生物传感器
·
电化学检测
·
纳米技术
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）