scholarly journals 3D Hierarchical Polyaniline–Metal Hybrid Nanopillars: Morphological Control and Its Antibacterial Application

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2716
Author(s):  
Jueun Kim ◽  
Younseong Song ◽  
Hogi Kim ◽  
Nam-Ho Bae ◽  
Tae Jae Lee ◽  
...  
Keyword(s):  
Polymer Coating ◽  
High Performance ◽  
Morphological Changes ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Modern Society ◽  
Ammonium Persulfate ◽  
Functional Polymer ◽  
Hierarchical Nanostructure ◽  
Antibacterial Performance

Effective and reliable antibacterial surfaces are in high demand in modern society. Although recent works have shown excellent antibacterial performance by combining unique hierarchical nanotopological structures with functional polymer coating, determining the antibacterial performance arising from morphological changes is necessary. In this work, three-dimensional (3D) hierarchical polyaniline–gold (PANI/Au) hybrid nanopillars were successfully fabricated via chemical polymerization (i.e., dilute method). The morphology and structures of the PANI/Au nanopillars were controlled by the reaction time (10 min to 60 h) and the molar concentrations of the monomer (0.01, 0.1, and 1 M aniline), oxidant (0.002, 0.0067, 0.01, and 0.02 M ammonium persulfate), and acid (0.01, 0.1, 1, and 2 M perchloric acid). These complex combinations allow controlling the hierarchical micro- to nanostructure of PANI on a nanopillar array (NPA). Furthermore, the surface of the 3D PANI/Au hierarchical nanostructure can be chemically treated while maintaining the structure using initiated chemical vapor deposition. Moreover, the excellent antibacterial performance of the 3D PANI/Au hierarchical nanostructure (HNS) exceeds 99% after functional polymer coating. The excellent antibacterial performance of the obtained 3D PANI/Au HNS is mainly because of the complex topological and physicochemical surface modification. Thus, these 3D PANI/Au hierarchical nanostructures are promising high-performance antibacterial materials.

scholarly journals Superior Pseudocapacitive Storage of a Novel Ni3Si2/NiOOH/Graphene Nanostructure for an All-Solid-State Supercapacitor

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Jing Ning ◽  
Maoyang Xia ◽  
Dong Wang ◽  
Xin Feng ◽  
Hong Zhou ◽  
...  
Keyword(s):  
Solid State ◽  
High Performance ◽  
Large Scale ◽  
Specific Capacity ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Specific Area ◽  
High Energy ◽  
Scale Production ◽  
Free Standing

Abstract Recent developments in the synthesis of graphene-based structures focus on continuous improvement of porous nanostructures, doping of thin films, and mechanisms for the construction of three-dimensional architectures. Herein, we synthesize creeper-like Ni3Si2/NiOOH/graphene nanostructures via low-pressure all-solid melting-reconstruction chemical vapor deposition. In a carbon-rich atmosphere, high-energy atoms bombard the Ni and Si surface, and reduce the free energy in the thermodynamic equilibrium of solid Ni–Si particles, considerably catalyzing the growth of Ni–Si nanocrystals. By controlling the carbon source content, a Ni3Si2 single crystal with high crystallinity and good homogeneity is stably synthesized. Electrochemical measurements indicate that the nanostructures exhibit an ultrahigh specific capacity of 835.3 C g−1 (1193.28 F g−1) at 1 A g−1; when integrated as an all-solid-state supercapacitor, it provides a remarkable energy density as high as 25.9 Wh kg−1 at 750 W kg−1, which can be attributed to the free-standing Ni3Si2/graphene skeleton providing a large specific area and NiOOH inhibits insulation on the electrode surface in an alkaline solution, thereby accelerating the electron exchange rate. The growth of the high-performance composite nanostructure is simple and controllable, enabling the large-scale production and application of microenergy storage devices.

Carbon nanospheres hanging on carbon nanotubes: a hierarchical three-dimensional carbon nanostructure for high-performance supercapacitors

2017 ◽  
Vol 5 (32) ◽  
pp. 16595-16599 ◽  
Author(s):  
Yongsheng Zhou ◽  
Pan Jin ◽  
Yatong Zhou ◽  
Yingchun Zhu
Keyword(s):  
Carbon Nanotubes ◽  
Vapor Deposition ◽  
High Performance ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Single Step ◽  
Chemical Vapor Deposition Method ◽  
Carbon Nanostructure ◽  
Carbon Nanospheres ◽  
Simple Chemical

We describe the single-step synthesis of carbon nanospheres hanging on carbon nanotubes (CNs/CNTs), using a simple chemical vapor deposition method.

Detection of MicroRNA Based on Three-Dimensional Graphene Field-Effect Transistor Biosensor

NANO ◽  
2020 ◽  
Vol 15 (03) ◽  
pp. 2050039
Author(s):  
Ruihong Song ◽  
Meng Tian ◽  
Yingxian Li ◽  
Jianjian Liu ◽  
Guofeng Liu ◽  
...  
Keyword(s):  
Field Effect ◽  
High Performance ◽  
Field Effect Transistor ◽  
Nickel Foam ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Current Response ◽  
Promising Alternative ◽  
Graphene Field Effect Transistor ◽  
Effect Transistor

MicroRNA (miRNAs) are post-transcriptional gene regulators and can be easily detected in plasma, which suggests a promising role as diagnostic markers. In this paper, we reported a nanomaterial of three-dimensional graphene (3D-G) grown on nickel foam by chemical vapor deposition (CVD). As a conductive channel, the 3D-G was made into field-effect transistor (FET) biosensor, showing high-performance in detecting of miRNA. We demonstrated that 3D-G FET biosensor was able to achieve a detection limit as low as 100[Formula: see text]pM and also has a good linear current response to miRNA concentrations in a broad range from 100[Formula: see text]pM to 100[Formula: see text]nM. Overall, the 3D-G FET biosensor was shown as a very promising alternative tool for the detection of miRNAs in biomedical research and early clinical diagnostic studies.

scholarly journals Synthesis of interconnected mesoporous ZnCo2O4 nanosheets on a 3D graphene foam as a binder-free anode for high-performance Li-ion batteries

RSC Advances ◽  
2018 ◽  
Vol 8 (59) ◽  
pp. 33717-33727 ◽  
Author(s):  
Xu Wang ◽  
Qi Chen ◽  
Pei Zhao ◽  
Miao Wang
Keyword(s):  
High Performance ◽  
Graphene Film ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Li Ion Batteries ◽  
Hydrothermal Route ◽  
3D Graphene ◽  
Cvd Method ◽  
Binder Free ◽  
Li Ion

Mesoporous ZnCo2O4 nanomaterials grown on a three-dimensional (3D) graphene film (GF) coated on Ni foam (NF) have been synthesized via an effective chemical vapor deposition (CVD) method combined with a subsequent hydrothermal route.

scholarly journals Three-Dimensional Graphene Composite Containing Graphene-SiO2 Nanoballs and Its Potential Application in Stress Sensors

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 438 ◽  
Author(s):  
Bowei Zhao ◽  
Tai Sun ◽  
Xi Zhou ◽  
Xiangzhi Liu ◽  
Xiaoxia Li ◽  
...  
Keyword(s):  
Self Assembly ◽  
High Performance ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
High Sensitivity ◽  
Measurement Range ◽  
Recoverable Strain ◽  
Assembly Method ◽  
Stress Sensors ◽  
One Step

Combining functional nanomaterials composite with three-dimensional graphene (3DG) is a promising strategy for improving the properties of stress sensors. However, it is difficult to realize stress sensors with both a wide measurement range and a high sensitivity. In this paper, graphene-SiO2 balls (GSB) were composed into 3DG in order to solve this problem. In detail, the GSB were prepared by chemical vapor deposition (CVD) method, and then were dispersed with graphene oxide (GO) solution to synthesize GSB-combined 3DG composite foam (GSBF) through one-step hydrothermal reduction self-assembly method. The prepared GSBF owes excellent mechanical (95% recoverable strain) and electrical conductivity (0.458 S/cm). Furthermore, it exhibits a broad sensing range (0–10 kPa) and ultrahigh sensitivity (0.14 kPa−1). In addition, the water droplet experiment demonstrates that GSBF is a competitive candidate of high-performance materials for stress sensors.

Ultrathin NiCo2O4nanosheets grown on three-dimensional interwoven nitrogen-doped carbon nanotubes as binder-free electrodes for high-performance supercapacitors

2015 ◽  
Vol 3 (29) ◽  
pp. 15331-15338 ◽  
Author(s):  
Jian Wu ◽  
Pan Guo ◽  
Rui Mi ◽  
Xichuan Liu ◽  
Hui Zhang ◽  
...  
Keyword(s):  
High Performance ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Chemical Vapor Deposition Method ◽  
Deposition Method ◽  
Ni Foam ◽  
Calcination Process ◽  
Electrochemical Deposition Method ◽  
Binder Free ◽  
Nitrogen Doped Carbon

A three-dimensional Ni foam/N-CNT/NiCo2O4nanosheet electrode was synthesized by combining a chemical vapor deposition method and a facile electrochemical deposition method followed by a calcination process.

scholarly journals Highly Conductive PDMS Composite Mechanically Enhanced with 3D-Graphene Network for High-Performance EMI Shielding Application

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 768
Author(s):  
Dongyi Ao ◽  
Yongliang Tang ◽  
Xiaofeng Xu ◽  
Xia Xiang ◽  
Jingxia Yu ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
High Performance ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Fiber Network ◽  
3D Graphene ◽  
Loading Level ◽  
Emi Shielding Effectiveness

A highly conductive three-dimensional (3D) graphene network (GN) was fabricated by chemical vapor deposition on a 3D nickel fiber network and subsequent etching process. Then a lightweight and flexible polydimethylsiloxane (PDMS)/GN composite was prepared by a vacuum infiltration method by using the graphene network as a template. The composite showed the superior electrical conductivity of 6100 S/m even at a very low loading level of graphene (1.2 wt %). As a result, an outstanding electromagnetic interference (EMI) shielding effectiveness (SE) of around 40 and 90 dB can be achieved in the X-band at thicknesses of 0.25 and 0.75 mm, respectively, which are much higher than most of the conductive polymers filled with carbon. The 3D graphene network can also act as a mechanical enhancer for PDMS. With a loading level of 1.2 wt %, the composite shows a significant increase by 256% in tensile strength.

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