scholarly journals Galactose biosensor based on ZnO nano material

2017 ◽  
Vol 1 (T4) ◽  
pp. 123-129
Author(s):  
Ha Phan Phuong La ◽  
Hien Thi Thu Nguyen ◽  
Trung Quang Tran
Keyword(s):  
Optical Waveguides ◽  
High Surface ◽  
Zno Nanorods ◽  
High Surface Area ◽  
Galactose Oxidase ◽  
Detection Range ◽  
One Dimensional ◽  
Linear Detection ◽  
Potential Applications ◽  
Type Semiconductor

ZnO nanomaterial is a n-type semiconductor material and exits in a variety of one-dimensional nanostructures such as: nanorods, nanotubes, nanowalls, nanowires, ect… [3]. They have potential applications in making devices such as: light emiting diodes, optical waveguides, nanolaser, gas sensor, biosensor. Due to the high surface area to volume ratios, nontoxicity, chemical stability, biocompatibility, the high isoelectric point (IEP: 9.5), ect…; ZnO nanorods were largely used for biosensor. In this work, we developed enzyme electrode biosensor based on ZnO nanorods to test galactose solution by immobilizing galactose oxidase on ZnO nanorods grown on FTO substrate. The result showed that the proposed biosensor had the linear detection range from 40 to 230 mM galactose solution.

scholarly journals The Facile Synthesis of Novel ZnO Nanostructure for Galactose Biosensor Application

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Phuong Ha La Phan ◽  
Quang Trung Tran ◽  
Duc Anh Dinh ◽  
Ko Kang Bok ◽  
Chang-Hee Hong ◽  
...  
Keyword(s):  
Low Cost ◽  
High Surface ◽  
Zno Nanorods ◽  
High Surface Area ◽  
Volume Ratio ◽  
Galactose Oxidase ◽  
Electrode Structure ◽  
Detection Range ◽  
Zno Nanostructure ◽  
Biosensor Application

We introduce a novel structure of ZnO nanorods (NRs) grown on ZnO NRs (ZnO NRs/NRs) via a facile, low-cost, and environmentally friendly synthesis for galactose biosensor application. The galactose oxidase enzyme (GalOx) is immobilized on the ZnO NR/NR surface to form the novel electrode structure (GalOx|ZnO NRs/NRs). The GalOx|ZnO NR/NR electrode has a linear detection range of current density from 11.30 μA/mm2 to 18.16 μA/mm2 over a galactose concentration range from 40 mM to 230 mM, indicating the increment of electrode sensitivity up to 60.7%. The ZnO NR/NR morphology with a high surface area to volume ratio has a great contribution to the electrochemical performance of galactose biosensor. Our results propose a straightforward approach to fabricate architecturally ZnO-based nanostructure for biosensor application.

scholarly journals Development of Galactose Biosensor Based on Functionalized ZnO Nanorods with Galactose Oxidase

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
K. Khun ◽  
Z. H. Ibupoto ◽  
O. Nur ◽  
M. Willander
Keyword(s):  
Ascorbic Acid ◽  
Electromotive Force ◽  
Zno Nanorods ◽  
Galactose Oxidase ◽  
Fast Time ◽  
Good Sensitivity ◽  
Magnesium Ions ◽  
Detection Range ◽  
Linear Detection ◽  
Cross Linker

The fabrication of galactose biosensor based on functionalised ZnO nanorods is described. The galactose biosensor was developed by immobilizing galactose oxidase on ZnO nanorods in conjunction with glutaraldehyde as a cross-linker molecule. The IRAS study provided evidence for the interaction of galactose oxidase with the surface of ZnO nanorods. The electromotive force (EMF) response of the galactose biosensor was measured by potentiometric method. We observed that the proposed biosensor has a linear detection range over a concentration range from 10 mM to 200 mM with good sensitivity of89.10±1.23 mV/decade. In addition, the proposed biosensor has shown fast time response of less than 10 s and a good selectivity towards galactose in the presence of common interferents such as ascorbic acid, uric acid, glucose, and magnesium ions. The galactose biosensor based on galactose oxidase immobilized ZnO nanorods has a shelf life more than four weeks.

scholarly journals One-Dimensional (1D) Nanostructured Materials for Energy Applications

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2609
Author(s):  
Abniel Machín ◽  
Kenneth Fontánez ◽  
Juan C. Arango ◽  
Dayna Ortiz ◽  
Jimmy De León ◽  
...  
Keyword(s):  
Nanostructured Materials ◽  
Fossil Fuels ◽  
High Surface ◽  
High Surface Area ◽  
Future Research ◽  
One Dimensional ◽  
Progressive Movement ◽  
1D Nanostructures ◽  
Energy Applications ◽  
Energy Processes

At present, the world is at the peak of production of traditional fossil fuels. Much of the resources that humanity has been consuming (oil, coal, and natural gas) are coming to an end. The human being faces a future that must necessarily go through a paradigm shift, which includes a progressive movement towards increasingly less polluting and energetically viable resources. In this sense, nanotechnology has a transcendental role in this change. For decades, new materials capable of being used in energy processes have been synthesized, which undoubtedly will be the cornerstone of the future development of the planet. In this review, we report on the current progress in the synthesis and use of one-dimensional (1D) nanostructured materials (specifically nanowires, nanofibers, nanotubes, and nanorods), with compositions based on oxides, nitrides, or metals, for applications related to energy. Due to its extraordinary surface–volume relationship, tunable thermal and transport properties, and its high surface area, these 1D nanostructures have become fundamental elements for the development of energy processes. The most relevant 1D nanomaterials, their different synthesis procedures, and useful methods for assembling 1D nanostructures in functional devices will be presented. Applications in relevant topics such as optoelectronic and photochemical devices, hydrogen production, or energy storage, among others, will be discussed. The present review concludes with a forecast on the directions towards which future research could be directed on this class of nanostructured materials.

scholarly journals Metal-Organic Framework-Based Engineered Materials—Fundamentals and Applications

Molecules ◽  
2020 ◽  
Vol 25 (7) ◽  
pp. 1598 ◽  
Author(s):  
Tahir Rasheed ◽  
Komal Rizwan ◽  
Muhammad Bilal ◽  
Hafiz M. N. Iqbal
Keyword(s):  
Drug Delivery ◽  
Metal Organic Framework ◽  
High Surface ◽  
High Surface Area ◽  
Co2 Reduction ◽  
Biological Species ◽  
Crystalline Materials ◽  
Potential Applications ◽  
Metal Organic ◽  
Catalytic Chemistry

Metal-organic frameworks (MOFs) are a fascinating class of porous crystalline materials constructed by organic ligands and inorganic connectors. Owing to their noteworthy catalytic chemistry, and matching or compatible coordination with numerous materials, MOFs offer potential applications in diverse fields such as catalysis, proton conduction, gas storage, drug delivery, sensing, separation and other related biotechnological and biomedical applications. Moreover, their designable structural topologies, high surface area, ultrahigh porosity, and tunable functionalities all make them excellent materials of interests for nanoscale applications. Herein, an effort has been to summarize the current advancement of MOF-based materials (i.e., pristine MOFs, MOF derivatives, or MOF composites) for electrocatalysis, photocatalysis, and biocatalysis. In the first part, we discussed the electrocatalytic behavior of various MOFs, such as oxidation and reduction candidates for different types of chemical reactions. The second section emphasizes on the photocatalytic performance of various MOFs as potential candidates for light-driven reactions, including photocatalytic degradation of various contaminants, CO2 reduction, and water splitting. Applications of MOFs-based porous materials in the biomedical sector, such as drug delivery, sensing and biosensing, antibacterial agents, and biomimetic systems for various biological species is discussed in the third part. Finally, the concluding points, challenges, and future prospects regarding MOFs or MOF-based materials for catalytic applications are also highlighted.

scholarly journals Solid State Electronic Sensors for Detection of Carbon Dioxide

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3848 ◽  
Author(s):  
Ami Hannon ◽  
Jing Li
Keyword(s):  
Carbon Dioxide ◽  
Iron Oxide ◽  
High Surface ◽  
High Surface Area ◽  
Multiwall Carbon Nanotubes ◽  
High Sensitivity ◽  
Space Applications ◽  
Detection Range ◽  
Ultra Low Power ◽  
Compact Size

Detection of carbon dioxide (CO2) is very important for environmental, health, safety and space applications. We have studied novel multiwall carbon nanotubes (MWCNTs) and an iron oxide (Fe2O3) nanocomposite based chemiresistive sensor for detection of CO2 at room temperature. The sensor has been miniaturized to a chip size (1 cm × 2 cm). Good sensing performance was observed with a wide detection range of CO2 concentrations (100–6000 ppm). Structural properties of the sensing materials were characterized using Field-Emission Scanning Electron Microscopy, Fourier-Transform Infrared and Raman spectroscopies. The greatly improved sensitivity of the composite materials to CO2 can be attributed to the formation of a depletion layer at the p-n junction in an MWCNT/iron oxide heterostructure, and new CO2 gas molecules adhere to the high surface area of MWCNTs due to the concentration gradient. The test results showed that the CO2 sensor possesses fast response, compact size, ultra-low power consumption, high sensitivity and wide dynamic detection range.

scholarly journals Toxicity Studies on Graphene-Based Nanomaterials in Aquatic Organisms: Current Understanding

Molecules ◽  
2020 ◽  
Vol 25 (16) ◽  
pp. 3618
Author(s):  
Nemi Malhotra ◽  
Oliver B. Villaflores ◽  
Gilbert Audira ◽  
Petrus Siregar ◽  
Jiann-Shing Lee ◽  
...  
Keyword(s):  
High Surface ◽  
High Surface Area ◽  
Aquatic Organisms ◽  
Current Understanding ◽  
Toxic Effects ◽  
Fish Cell ◽  
Conductivity Electron ◽  
Potential Applications ◽  
Aquatic Food ◽  
Living Organisms

Graphene and its oxide are nanomaterials considered currently to be very promising because of their great potential applications in various industries. The exceptional physiochemical properties of graphene, particularly thermal conductivity, electron mobility, high surface area, and mechanical strength, promise development of novel or enhanced technologies in industries. The diverse applications of graphene and graphene oxide (GO) include energy storage, sensors, generators, light processing, electronics, and targeted drug delivery. However, the extensive use and exposure to graphene and GO might pose a great threat to living organisms and ultimately to human health. The toxicity data of graphene and GO is still insufficient to point out its side effects to different living organisms. Their accumulation in the aquatic environment might create complex problems in aquatic food chains and aquatic habitats leading to debilitating health effects in humans. The potential toxic effects of graphene and GO are not fully understood. However, they have been reported to cause agglomeration, long-term persistence, and toxic effects penetrating cell membrane and interacting with cellular components. In this review paper, we have primarily focused on the toxic effects of graphene and GO caused on aquatic invertebrates and fish (cell line and organisms). Here, we aim to point out the current understanding and knowledge gaps of graphene and GO toxicity.

Gas permeability of carbon aerogels

1993 ◽  
Vol 8 (12) ◽  
pp. 3100-3105 ◽  
Author(s):  
F-M. Kong ◽  
J.D. LeMay ◽  
S.S. Hulsey ◽  
C.T. Alviso ◽  
R.W. Pekala
Keyword(s):  
Pore Size ◽  
Gas Flow ◽  
Gas Permeability ◽  
High Surface ◽  
High Surface Area ◽  
Supercritical Drying ◽  
Flow Equation ◽  
Carbon Aerogels ◽  
Thin Specimen ◽  
Potential Applications

Carbon aerogels are synthesized via the aqueous polycondensation of resorcinol with formaldehyde, followed by supercritical drying and subsequent pyrolysis at 1050 °C. As a result of their interconnected porosity, ultrafine cell/pore size, and high surface area, carbon aerogels have many potential applications such as supercapacitors, battery electrodes, catalyst supports, and gas filters. The performance of carbon aerogels in the latter two applications depends on the permeability or gas flow conductance in these materials. By measuring the pressure differential across a thin specimen and the nitrogen gas flow rate in the viscous regime, the permeability of carbon aerogels was calculated from equations based upon Darcy's law. Our measurements show that carbon aerogels have permeabilities on the order of 10−12 to 10−10 cm2 over the density range from 0.05–0.44 g/cm3. Like many other aerogel properties, the permeability of carbon aerogels follows a power law relationship with density, reflecting differences in the average mesopore size. Comparing the results from this study with the permeability of silica aerogels reported by other workers, we found that the permeability of aerogels is governed by a simple universal flow equation. This paper discusses the relationship among permeability, pore size, and density in carbon aerogels.

scholarly journals Structural and Photovoltaic Properties of High Surface Area One-dimensional Nanostructured TiO2

2007 ◽  
Vol 1 (4) ◽  
pp. 459-468 ◽  
Author(s):  
Sorapong PAVASUPREE ◽  
Supachai NGAMSINLAPASATHIAN ◽  
Yoshikazu SUZUKI ◽  
Susumu YOSHIKAWA
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Photovoltaic Properties ◽  
Nanostructured Tio2 ◽  
One Dimensional

scholarly journals High performance Ce-doped ZnO nanorods for sunlight-driven photocatalysis

2016 ◽  
Vol 7 ◽  
pp. 1338-1349 ◽  
Author(s):  
Bilel Chouchene ◽  
Tahar Ben Chaabane ◽  
Lavinia Balan ◽  
Emilien Girot ◽  
Kevin Mozet ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Average Length ◽  
High Surface ◽  
Zno Nanorods ◽  
High Surface Area ◽  
Visible Region ◽  
Solar Light ◽  
Effective Electron ◽  
Doped Zno ◽  
Zno Rods

Ce-doped ZnO (ZnO:Ce) nanorods have been prepared through a solvothermal method and the effects of Ce-doping on the structural, optical and electronic properties of ZnO rods were studied. ZnO:Ce rods were characterized by XRD, SEM, TEM, XPS, BET, DRS and Raman spectroscopy. 5% Ce-doped ZnO rods with an average length of 130 nm and a diameter of 23 nm exhibit the highest photocatalytic activity for the degradation of the Orange II dye under solar light irradiation. The high photocatalytic activity is ascribed to the substantially enhanced light absorption in the visible region, to the high surface area of ZnO:Ce rods and to the effective electron–hole pair separation originating from Ce doping. The influence of various experimental parameters like the pH, the presence of salts and of organic compounds was investigated and no marked detrimental effect on the photocatalytic activity was observed. Finally, recyclability experiments demonstrate that ZnO:Ce rods are a stable solar-light photocatalyst.

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