Ultrasensitive reversible oxygen sensing by using liquid-exfoliated MoS2 nanoparticles

2016 ◽  
Vol 4 (16) ◽  
pp. 6070-6076 ◽  
Author(s):  
Yeon Hoo Kim ◽  
Kye Yeop Kim ◽  
You Rim Choi ◽  
Young-Seok Shim ◽  
Jong-Myeong Jeon ◽  
...  
Keyword(s):  
Specific Surface ◽  
Band Gap ◽  
Molybdenum Disulfide ◽  
Surface Area ◽  
Specific Surface Area ◽  
Gas Sensors ◽  
Band Gap Energy ◽  
High Specific Surface Area ◽  
Two Dimensional ◽  
Gap Energy

Two-dimensional (2D) molybdenum disulfide (MoS2) has been attracting rapidly increasing interest for application in chemoresistive gas sensors owing to its moderate band gap energy and high specific surface area.

scholarly journals Optimized Synthesis Temperature and Time to Obtain Crystalline Carbon Nitride with Enhanced Photocatalytic Activity for Phenol Degradation

2020 ◽  
Vol 20 (6) ◽  
pp. 1392
Author(s):  
Leny Yuliati ◽  
Mohd Hayrie Mohd Hatta ◽  
Siew Ling Lee ◽  
Hendrik Oktendy Lintang
Keyword(s):  
Photocatalytic Activity ◽  
Specific Surface ◽  
Band Gap ◽  
Surface Area ◽  
Carbon Nitride ◽  
Phenol Degradation ◽  
Synthesis Temperature ◽  
Band Gap Energy ◽  
Synthesis Time ◽  
Gap Energy

In this work, the crystalline carbon nitride photocatalysts were synthesized by an ionothermal technique with varied synthesis temperature of 500, 550, and 600 °C, and synthesis time of 2, 4, and 6 h. Fourier transform infrared spectra showed the successful formation of the prepared carbon nitrides from their characteristic vibration peaks. X-ray diffraction patterns suggested that the same phase of poly(triazine imide) and heptazine could be observed, but with different crystallinity. The optical properties showed that different temperatures and synthesis time resulted in the different band gap energy (2.72–3.02 eV) as well as the specific surface area (24–73 m2 g–1). The transmission electron microscopy image revealed that the crystalline carbon nitride has a near-hexagonal prismatic crystallite size of about 50 nm. Analysis by high-performance liquid chromatography showed that the best photocatalytic activity for phenol degradation under solar light simulator was obtained on the crystalline carbon nitride prepared at the 550 °C for 4 h, which would be due to the high crystallinity, suitable low band gap energy (2.82 eV), and large specific surface area (73 m2 g–1). Controlling both the temperature and synthesis time is shown to be important to obtain the best physicochemical properties leading to high activity.

Ultrathin mesoporous F-doped α-Ni(OH)2 nanosheets as an efficient electrode material for water splitting and supercapacitors

2019 ◽  
Vol 7 (16) ◽  
pp. 9656-9664 ◽  
Author(s):  
Nadeem Hussain ◽  
Wenjuan Yang ◽  
Jianmin Dou ◽  
Yanan Chen ◽  
Yitai Qian ◽  
...  
Keyword(s):  
Energy Storage ◽  
Specific Surface ◽  
Surface Area ◽  
Water Splitting ◽  
Specific Surface Area ◽  
Electrode Material ◽  
Storage Systems ◽  
High Specific Surface Area ◽  
Two Dimensional ◽  
2D Nanomaterials

Two-dimensional (2D) nanomaterials with a high specific surface area and mesoporous nature are attractive and have wide applications in catalysis, energy storage systems, etc.

scholarly journals Efficient Sunlight-Induced Methylene Blue Removal over One-Dimensional Mesoporous Monoclinic BiVO4Nanorods

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Linrui Hou ◽  
Long Yang ◽  
Jiaoyang Li ◽  
Jie Tan ◽  
Changzhou Yuan
Keyword(s):  
Methylene Blue ◽  
Specific Surface ◽  
Band Gap ◽  
Surface Area ◽  
Specific Surface Area ◽  
Mesoporous Structure ◽  
High Specific Surface Area ◽  
One Dimensional ◽  
Light Region ◽  
Degussa P25

Sunlight-driven mesoporous BiVO4nanorods with monoclinic structure have been successfully synthesizedviaa simple hydrothermal method. The as-prepared one-dimensional BiVO4nanorods exhibited high specific surface area due to their unique mesoporous structure. The mesoporous BiVO4nanorods possessed strong photoabsorption properties in the visible light region as well as the ultravisible region, and the band gap was estimated to beca.2.18 eV. The photocatalytic activities were evaluated by decolorization of methylene blue under sunlight irradiation. Photocatalytic tests demonstrated that the decolorization rate of as-prepared mesoporous BiVO4nanorods was even up to 98.8% in 180 min, much better than that prepared by solid-state reaction (23.1%) and the commercial TiO2(Degussa P25) (14.2%) under the same conditions, due to their higher specific surface area and appropriate band gap. Moreover, the unique BiVO4nanorods exhibit high stability after five photocatalytic degradation recycles.

Photocatalytic Application of Graphene-Based TiO2 Nanocomposite

2017 ◽  
Vol 266 ◽  
pp. 79-83
Author(s):  
Vorrada Loryuenyong ◽  
Khajornsak Intong ◽  
Vannapa Pongpraphan ◽  
Watcharothai Suksakkhee ◽  
Achanai Buasri
Keyword(s):  
Graphene Oxide ◽  
Specific Surface ◽  
Band Gap ◽  
Surface Area ◽  
Specific Surface Area ◽  
Energy Band ◽  
Uv Light ◽  
High Specific Surface Area ◽  
Energy Band Gap ◽  
Photodegradation Efficiency

Titanium dioxide (TiO2) is one of the most well known photocatalytic materials. However, TiO2 is only photoactive to ultraviolet (UV) light, and the lifetime of the electron-hole pair recombination is too short. In this work, TiO2 anatase nanotubes with an energy band gap of 3.01 eV and specific surface area of 112.46 m2/g were synthesized via hydrothermal method. The results showed that, by incorporating graphene oxide (XGO) and reduced graphene oxide (RGO), the photodegradation efficiency could be enhanced by increasing electron lifetime and charge carrier separation, as well as narrowing the energy band gap. The examination of photodegradation activity under UVC irradiation indicated that a maximum photodegradation efficiency was achieved with TiO2-XGO nanocomposite due to its high specific surface area and strong hydrophilic property.

scholarly journals Preparation and Properties of Graphene-based Inorganic Nanocomposites

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Qing Liao ◽  
Tingting Song
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Chemical Stability ◽  
High Performance ◽  
Inorganic Compounds ◽  
High Specific Surface Area ◽  
Two Dimensional ◽  
Preparation Methods ◽  
Inorganic Nanocomposites

Graphene is a two-dimensional hexagonal monoatomic layer crystal composed of carbon atoms, which exhibits the shape of a honeycomb and plays an important role in the fields of optics and mechanics. It also has the advantages of high specific surface area, strong chemical stability and special planar structure. It is an ideal carrier for carrying various inorganic compounds and is suitable for the development of high performance graphene-based inorganic nanocomposites.[1] Based on this, the paper introduces the characteristics of graphene, expounds the related content of graphene-based inorganic nanocomposites, and studies the preparation methods and properties of graphene-based inorganic nanocomposites.

Mesostructured TiO2 and SiO2 as High Specific Surface Area Coatings for Love Wave Gas Sensors

2011 ◽  
Vol 9 (2) ◽  
pp. 763-766 ◽  
Author(s):  
L. Blanc ◽  
A. Tetelin ◽  
C. Boissière ◽  
G. Tortissier ◽  
J.-L. Lachaud ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Gas Sensors ◽  
Love Wave ◽  
High Specific Surface Area

Synthesis of Porous Molybdenum Disulfide Materials with High Specific Surface Area Using Sodium Chloride as the Template

2011 ◽  
Vol 217-218 ◽  
pp. 1569-1573
Author(s):  
Gao Jun An ◽  
Chun Hua Xiong ◽  
Chang Bo Lu ◽  
Zhao Jun Chen
Keyword(s):  
Sodium Chloride ◽  
Specific Surface ◽  
Molybdenum Disulfide ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
Synthetic Approach ◽  
X Ray ◽  
Bet Method ◽  
Convenient Synthetic Approach

One novel, simple and convenient synthetic approach has been proposed to prepare the porous molybdenum disulfide materials by utilizing ammonium tetrathiomolybdate as the precursor and sodium chloride as the template. The as-synthesized products were characterized by X-ray powder Diffraction (XRD), Low-temperature N2 Adsorption (BET method), and Scanning Electron Microscopy (SEM). The characterization results reveal that the as-synthesized molybdenum disulfide material has high specific surface area (253.5 m2/g).

scholarly journals Nanoporous Quasi-High-Entropy Alloy Microspheres

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 345 ◽  
Author(s):  
Lianzan Yang ◽  
Yongyan Li ◽  
Zhifeng Wang ◽  
Weimin Zhao ◽  
Chunling Qin
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
High Entropy Alloy ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Hierarchical Porous

High-entropy alloys (HEAs) present excellent mechanical properties. However, the exploitation of chemical properties of HEAs is far less than that of mechanical properties, which is mainly limited by the low specific surface area of HEAs synthesized by traditional methods. Thus, it is vital to develop new routes to fabricate HEAs with novel three-dimensional structures and a high specific surface area. Herein, we develop a facile approach to fabricate nanoporous noble metal quasi-HEA microspheres by melt-spinning and dealloying. The as-obtained nanoporous Cu30Au23Pt22Pd25 quasi-HEA microspheres present a hierarchical porous structure with a high specific surface area of 69.5 m2/g and a multiphase approximatively componential solid solution characteristic with a broad single-group face-centered cubic XRD pattern, which is different from the traditional single-phase or two-phase solid solution HEAs. To differentiate, these are named quasi-HEAs. The synthetic strategy proposed in this paper opens the door for the synthesis of porous quasi-HEAs related materials, and is expected to promote further applications of quasi-HEAs in various chemical fields.

KCl-assisted activation: Moringa oleifera branch-derived porous carbon for high performance supercapacitor

2021 ◽  
Vol 45 (12) ◽  
pp. 5712-5719
Author(s):  
Yongxiang Zhang ◽  
Peifeng Yu ◽  
Mingtao Zheng ◽  
Yong Xiao ◽  
Hang Hu ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Porous Carbon ◽  
High Performance ◽  
Moringa Oleifera ◽  
High Specific Surface Area ◽  
Porous Carbons

Porous carbons with a high specific surface area (2314–3470 m2 g−1) are prepared via a novel KCl-assisted activation strategy for high-performance supercapacitor.

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