Humidity sensing properties of reduced humic acid

Duraia, El‐Shazly M.; Beall, Gary W.

doi:10.1016/j.snb.2015.05.028

Cited by 27 publications

(8 citation statements)

References 25 publications

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“…Conventionally, the peak at 1352 cm −1 is attributed to the defects, and disorders arise in the sp 2 carbon rings (D-band). The other peak around 1595 cm −1 is due to the scattering of the first-order phonons ( E 2g ) which are usually called G-bands [ 43 , 44 ]. The inset of Fig.…”

Section: Discussionmentioning

confidence: 99%

Photo-Response of Functionalized Self-Assembled Graphene Oxide on Zinc Oxide Heterostructure to UV Illumination

2016

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Convective assembly technique which is a simple and scalable method was used for coating uniform graphene oxide (GO) nanosheets on zinc oxide (ZnO) thin films. Upon UV irradiation, an enhancement in the on-off ratio was observed after functionalizing ZnO films by GO nanosheets. The calculations of on-off ratio, the device responsivity, and the external quantum efficiency were investigated and implied that the GO layer provides a stable pathway for electron transport. Structural investigations of the assembled GO and the heterostructure of GO on ZnO were performed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The covered GO layer has a wide continuous area, with wrinkles and folds at the edges. In addition, the phonon lattice vibrations were investigated by Raman analysis. For GO and the heterostructure, a little change in the ratio between the D-band and G-band was found which means that no additional defects were formed within the heterostructure.

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Section: Discussionmentioning

confidence: 99%

Photo-Response of Functionalized Self-Assembled Graphene Oxide on Zinc Oxide Heterostructure to UV Illumination

2016

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“…HA has a strong coordination ability to metal ions due to rich oxygen-containing groups, which is often used to remove heavy metal ions in wastewater. HA layer has a similar physical structure, chemical structure, superficial polarity, and facial activity to graphene oxide (GO), and hence it can be regarded as a readymade, low-cost GO-like material. , Recently, some studies have been reported that HA-based graphene may be further synthesized successfully by various methods including catalytic reduction in hydrogen atmosphere, − heat graphitization route, and hydrothermal process . More new strategies for graphene transformation of HA are waiting to be exploited.…”

Section: Introductionmentioning

confidence: 99%

Design and Synthesis of N-Doped Carbon Skeleton Assembled by Carbon Nanotubes and Graphene as a High-Performance Electrode Material for Supercapacitors

Cong

et al. 2021

ACS Appl. Energy Mater.

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Current, there is an urgent demand for electrode materials with superior electrochemical performances for the development of supercapacitors. A nitrogen-doped carbon skeleton (NCS) assembled by carbon nanotubes and graphene layers is designed and synthesized utilizing a layer-shaped humate-based zeolitic imidazolate framework (ZIF) (HA-CoFe-ZIF) as a template in this work. The synthesized NCS is mainly composed of graphitized carbon with a few hydroxyl groups on its surface, synchronously doped by 9.5 at % nitrogen in the state of pyridinic N and pyrrolic N. The rich mesoporous structure entitles it to a high Brunauer–Emmett–Teller (BET) specific surface area of 427 m2 g–1 and suitable BET average pore diameter of 3.14 nm. The NCS has a high capacity of 324 F g–1 at 1 A g–1, good rate capability (capacitance retention of 71% from 5 to 100 A g–1), and excellent cycling stability (capacitance retention of 96 and 87% after 5000 and 10 000 cycles, respectively). The fabricated NCS//AC asymmetric supercapacitor also exhibits a high capacity of 93 F g–1 at 1 A g–1, large energy density of 10.3 Wh kg–1 at 331 W kg–1, and good cycling performance (capacitance retention of 88% after 5000 cycles). Our elaborately designed NCS materials exhibit multiple structural advantages including rich mesoporous structure, various graphitic carbon, and high-dosage nitrogen doping, resulting in high capacitance performances. This humate-based metal–organic framework (MOF)-derived strategy provides a good idea for the synthesis of high-performance carbon skeleton materials applied to energy storage.

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“…Humidity monitoring has taken an important role in numerous areas such as corrosion protection, precision electronics manufacturing, food processing, and other industries [ 1 , 2 , 3 ]. Traditional humidity sensors are mainly based on electric, gravimetric, and thermal conductive technology including capacitive type, resistive type, and photoelectric type humidity sensors [ 4 , 5 , 6 , 7 , 8 ]. Among those humidity sensors, electric humidity sensors with high sensitivity and accuracy are widely produced in the current market.…”

Section: Introductionmentioning

confidence: 99%

High Sensitivity Humidity Detection Based on Functional GO/MWCNTs Hybrid Nano-Materials Coated Titled Fiber Bragg Grating

Wang

Zhang

et al. 2021

Nanomaterials

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A high performance humidity sensor using tilted fiber Bragg grating (TFBG) and functional graphene oxide (GO)/multi-walled carbon nanotubes (MWCNTs) hybrid nano-materials was proposed. The humidity-sensitive material with three-dimensional (3D) structure was synthesized by the MWCNTs and GOs. Comparing with traditional two dimensional (2D) GOs film, water molecules could be absorbed effectively due to the larger ripples and more holes in GO/MWCNTs layers. The water molecule will fill the entire space in the 3D structure instead of air, which further enhances the absorption efficiency of the hybrid nanomaterial. TFBG as a compact and robust surrounding complex dielectric constant sensing platform was utilized. The mode coupling coefficient or the amplitude of TFBG cladding mode will vary sharply with the imaginary part of permittivity of the hybrid nanomaterial, realizing the high performance RH sensing. In the experiments, we successfully demonstrated that this 3D structural nanomaterial composed by the MWCNTs and GOs has significant advantages for expanding the range of humidity detection (range from 30% to 90%) and enhancing the detection sensitivity (0.377 dB/% RH is twice more than humidity sensor with 2D GO film). The TFBG-based RH sensor also exhibits good repeatability and stability. Our proposed humidity sensor has potential application in environmental and healthy monitoring fields.

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Humidity sensing properties of reduced humic acid

Cited by 27 publications

References 25 publications

Photo-Response of Functionalized Self-Assembled Graphene Oxide on Zinc Oxide Heterostructure to UV Illumination

Photo-Response of Functionalized Self-Assembled Graphene Oxide on Zinc Oxide Heterostructure to UV Illumination

Design and Synthesis of N-Doped Carbon Skeleton Assembled by Carbon Nanotubes and Graphene as a High-Performance Electrode Material for Supercapacitors

High Sensitivity Humidity Detection Based on Functional GO/MWCNTs Hybrid Nano-Materials Coated Titled Fiber Bragg Grating

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