A SERS substrate with remarkable reproducibility: Adsorbing and detecting both hydrophobic and hydrophilic molecules using rGO/PEI/PAA/CD-AgNP nanocomposites

Fang, Junbin; Zhu, Junjia; Meng, Fanbin; Gu, Yu; Li, Guanghuan; Hou, Honghao; Lin, Zihua; Li, Xiangming

doi:10.1016/j.apsusc.2020.148708

Cited by 10 publications

(6 citation statements)

References 22 publications

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“…By analogy, the peak at 560 cm –1 in Figure a corresponds to the Raman peak of the C–H bending in the pristine polyelectrolytes . After electroforming (Figure b), interestingly, new Raman peaks are observed at 1346 and 1590 cm –1 , which depict the C–H bending vibration and C–C stretching vibration, respectively. , It is known that only the interdiffusion of the counterion cannot induce the changes mentioned above. In general, there are two reasons for enhancement of Raman signals. − The first reason is the surface-enhanced raman scattering (SERS) due to metal particles.…”

Section: Results and Discussionmentioning

confidence: 80%

“…After electroforming (Figure b), interestingly, new Raman peaks are observed at 1346 and 1590 cm –1 , which depict the C–H bending vibration and C–C stretching vibration, respectively. , It is known that only the interdiffusion of the counterion cannot induce the changes mentioned above. In general, there are two reasons for enhancement of Raman signals. − The first reason is the surface-enhanced raman scattering (SERS) due to metal particles. There are no metal particles in the polyelectrolyte films, implying that the increased crystallinity is responsible for the Raman signal enhancement in this case .…”

Section: Results and Discussionmentioning

confidence: 91%

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Polyelectrolyte Bilayer-Based Transparent and Flexible Memristor for Emulating Synapses

Ren

Liang

et al. 2022

ACS Appl. Mater. Interfaces

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Memristors will be critical components in the next generation of digital technology and artificial synapses. Researchers are investigating innovative mechanistic understanding of the memristor devices based on low-cost, solutionprocessable, and organic materials as promising candidates. Here, we demonstrate a novel polyelectrolyte-based memristor device, which is simply prepared by spin-coating poly(acrylic acid) (PAA) and polyethylenimine (PEI) on an indium tin oxide (ITO) substrate followed by a magnetron sputtering of the ITO as the top electrode. The device has a potential to achieve excellent resistive switching (RS) performance and synapse functionality as well as greater flexibility and transmittance when compared to the oxidebased memories. An on/off resistance ratio of 50 can be maintained without degradation for up to 20 000 cycles (flat state) and over 4000 cycles (bending to a 2 mm radius 10 000 times) in the DC sweep mode. Moreover, the device performs various synaptic functions, including spike-timing-dependent plasticity, pulse pair plasticity, and short-term and long-term plasticity in the potentiation and depression processes. The counterions and two oppositely charged polyelectrolyte chains can move in and out of each other depending on the applied electrical potential (pulse), resulting in a change in the potential drop at the interface of the polyelectrolyte bilayer and its electrodes, which can be attributed to the RS mechanism and various synaptic functions. This insight may accelerate the technological deployment of the organic resistive memories.

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Section: Results and Discussionmentioning

confidence: 80%

Section: Results and Discussionmentioning

confidence: 91%

Polyelectrolyte Bilayer-Based Transparent and Flexible Memristor for Emulating Synapses

Ren

Liang

et al. 2022

ACS Appl. Mater. Interfaces

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“…35 Therefore, to improve the pH tolerance of immobilized enzyme, the TA/ AEAPTES coating structure was optimized by adding the third hydrophilic monomer, 36 which was TEOS and PEI. 37 The water contact angles of the TA/AEAPTES, TA/AEAPTES/ TEOS, and TA/AEAPTES/PEI modified membranes are 50.8°, 40.8°, and 38.5°, respectively. Therefore, the hydrophilicity of the coatings was enhanced by introducing TOES and PEI.…”

Section: Resultsmentioning

confidence: 95%

“…Higher hydrophilicity is favorable to maintain enzyme conformation . Therefore, to improve the pH tolerance of immobilized enzyme, the TA/AEAPTES coating structure was optimized by adding the third hydrophilic monomer, which was TEOS and PEI . The water contact angles of the TA/AEAPTES, TA/AEAPTES/TEOS, and TA/AEAPTES/PEI modified membranes are 50.8°, 40.8°, and 38.5°, respectively.…”

Section: Resultsmentioning

confidence: 99%

Engineering Mussel-Inspired Coating on Membranes for Green Enzyme Immobilization and Hyperstable Reuse

Dong

Tan²,

Pinelo

et al. 2022

Ind. Eng. Chem. Res.

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A mussel-inspired coating based on catecholamine chemistry can serve as a versatile platform for covalent enzyme immobilization. However, its application was limited by the weak salt/acid/alkali tolerance. To tackle this issue, three silane coupling agents were screened to construct a coating layer on a nylon membrane with tannic acid (TA) for enzyme immobilization. It was found that TA/3-aminopropyltriethoxysilane (APTES), and TA/3-(2-aminoethylamino) propyltriethoxysilane (AEAPTES) coatings had higher enzyme loading and activity than TA/3glycidyloxypropyltrimethoxysilane (KH-560), because TA/APTES and TA/ AEAPTES coatings formed more nanoparticles and thus provided more active sites for enzyme attachment (taking glucose oxidase as an example). Then, the pH tolerance of the immobilized enzyme was greatly enhanced by reinforcing the interfacial interactions of membrane−coating and coating− enzyme, which was realized by membrane pretreatment, ternary additive, and metal ions chelation posttreatment. The optimized TA/AEAPTES/tetraethoxysilane (TEOS)-Fe 3+ coating showed excellent pH stability and reusability, and the immobilized enzyme retained 82%, 83%, and 79% of its initial activity even after 7 h of incubation in buffer solutions at pH 3, 7, and 11, respectively. Such a coating layer was also evaluated for zearalenone hydrolase (ZHD) immobilization, and the immobilized ZHD exhibited boosted activity and robust reusability in the degradation of zearalenone (ZEN, a refractory and hypertoxic mycotoxin). This work not only offered a green and practical strategy for enzyme immobilization but also provided fundamental data in the design of a musselinspired coating layer toward versatile applications.

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“…26 After electroforming (Figure 3a−c), new Raman peaks are observed at 1346 and 1590 cm −1 , depicting the C−H bending and C−C stretching, respectively. 27,28 Also, in Figure 3b,c, new Raman peaks are observed at 912 cm −1 , which correspond to a sulfonic group of PSS, 29,30 after electroforming. These phenomena suggest that the external electric field drives polyelectrolyte chain migration, resulting in an increase in crystallinity responsible for the Raman signal enhancement.…”

Section: ■ Experimental Detailsmentioning

confidence: 88%

Molecular Structure Engineering of Polyelectrolyte Bilayer-Based Memristors: Implications for Linear Potentiation and Depression Characteristics

Kang

Shi

Feng

et al. 2023

ACS Appl. Nano Mater.

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Critical to artificial intelligence’s future is emulating biological synapses with memristors. Moreover, according to a wide variety, low cost, simple fabrication, and good flexibility, organic materials provide a competitive approach in memristor and synapse emulation, especially in devices where ions carry current. Polyelectrolytes with different molecular structures were used as functional layers in this study to enhance the memory and synapse performance of polyelectrolyte bilayer-based memristors, performed by ions, and polyelectrolyte chain migration caused a potential drop change at the interface of the ∼15 nm thick polyelectrolyte bilayer and its electrodes. Consequently, the memory device with strong polyelectrolyte sodium poly(styrene sulfonic acid) (PSS) and poly(diallyl dimethylammonium chloride) (PDAC), which were prepared by spin-coating, shows outstanding resistive switching performance and synapse functionalities than those with weak polyelectrolytes and/or polyelectrolytes without a ring structure. Particularly, the indium tin oxide (ITO)/PSS/PDAC/ITO device shows almost linear potentiation and depression characteristics by applying continuous pulse voltage, which results in high performance on the artificial neural network simulation as 90% on the Mixed National Institute of Standards and Technology data set. The steric hindrance between the two polyelectrolytes with the five-ring structure can be attributed to the causation of linear conductance update. Furthermore, it shows short- and long-term plasticity during potentiation and depression, which is essential for the development of neuromorphic systems with complex cognitive capabilities.

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A SERS substrate with remarkable reproducibility: Adsorbing and detecting both hydrophobic and hydrophilic molecules using rGO/PEI/PAA/CD-AgNP nanocomposites

Cited by 10 publications

References 22 publications

Polyelectrolyte Bilayer-Based Transparent and Flexible Memristor for Emulating Synapses

Polyelectrolyte Bilayer-Based Transparent and Flexible Memristor for Emulating Synapses

Engineering Mussel-Inspired Coating on Membranes for Green Enzyme Immobilization and Hyperstable Reuse

Molecular Structure Engineering of Polyelectrolyte Bilayer-Based Memristors: Implications for Linear Potentiation and Depression Characteristics

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