Using C60 + sputtering to improve detection limit of nitrogen in zinc oxide

2010 ◽  
Vol 43 (1-2) ◽  
pp. 661-663 ◽  
Author(s):  
Zihua Zhu ◽  
Vaithiyalingam Shutthanandan ◽  
Ponnusamy Nachimuthu
Keyword(s):  
Zinc Oxide ◽  
Detection Limit ◽  
Improve Detection Limit

scholarly journals Purification of urine samples to improve detection limit of anabolic agents

2007 ◽  
Vol 39 (1) ◽  
pp. 39
Author(s):  
A Beotra ◽  
S Jain ◽  
T Kaur ◽  
Ranjit Lal ◽  
MadhusudhanaI Reddy
Keyword(s):  
Detection Limit ◽  
Urine Samples ◽  
Anabolic Agents ◽  
Improve Detection Limit

scholarly journals Conductometric Immunosensor for Escherichia coli O157:H7 Detection Based on Polyaniline/Zinc Oxide (PANI/ZnO) Nanocomposite

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3288
Author(s):  
Sawsan Mutlaq ◽  
Borhan Albiss ◽  
Anas A. Al-Nabulsi ◽  
Ziad W. Jaradat ◽  
Amin N. Olaimat ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Zinc Oxide ◽  
Detection Limit ◽  
Foodborne Pathogens ◽  
Skim Milk ◽  
Minimum Detection Limit ◽  
Escherichia Coli O157 ◽  
Detection Range ◽  
E Coli ◽  
Conductometric Immunosensor

A conductometric immunosensor was developed for the detection of one of the most common foodborne pathogens, Escherichia coli O157:H7 (E. coli O157:H7), by conductometric sensing. The sensor was built based on a polyaniline/zinc oxide (PANI/ZnO) nanocomposite film spin-coated on a gold electrode. Then, it was modified with a monoclonal anti-E. coli O157:H7 antibody as a biorecognition element. The fabricated nanostructured sensor was able to quantify the pathogens under optimal detection conditions, within 30 min, and showed a good detection range from 101 to 104 CFU/mL for E. coli O157:H7 and a minimum detection limit of 4.8 CFU/mL in 0.1% peptone water. The sensor efficiency for detecting bacteria in food matrices was tested in ultra-heat-treated (UHT) skim milk. E. coli O157:H7 was detected at concentrations of 101 to 104 CFU/mL with a minimum detection limit of 13.9 CFU/mL. The novel sensor was simple, fast, highly sensitive with excellent specificity, and it had the potential for rapid sample processing. Moreover, this unique technique for bacterial detection could be applicable for food safety and quality control in the food sector as it offers highly reliable results and is able to quantify the target bacterium.

Zinc oxide–black phosphorus composites for ultrasensitive nitrogen dioxide sensing

2018 ◽  
Vol 3 (5) ◽  
pp. 525-531 ◽  
Author(s):  
Qun Li ◽  
Yuan Cen ◽  
Jinyu Huang ◽  
Xuejin Li ◽  
Hao Zhang ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Charge Transfer ◽  
Detection Limit ◽  
Nitrogen Dioxide ◽  
Surface Area ◽  
Carrier Mobility ◽  
High Sensitivity ◽  
Fast Response ◽  
Environmental Stability ◽  
Response Behavior

ZnO–BP composites exhibit high sensitivity, fast response behavior, outstanding selectivity, and ultralow detection limit towards nitrogen dioxide due the large surface area, excellent carrier mobility, and enhanced charge transfer of ZnO–BP in the presence of BP. Moreover, the introduction of ZnO significantly enhances BP environmental stability.

ZnO Nanonails: Synthesis and Their Application as Glucose Biosensor

2008 ◽  
Vol 8 (6) ◽  
pp. 3216-3221 ◽  
Author(s):  
Ahmad Umar ◽  
M. M. Rahman ◽  
S. H. Kim ◽  
Y. B. Hahn
Keyword(s):  
Electron Transfer ◽  
Zinc Oxide ◽  
Detection Limit ◽  
Electrode Surface ◽  
Active Sites ◽  
Thermal Evaporation ◽  
Direct Electron Transfer ◽  
High Sensitivity ◽  
Glucose Biosensor ◽  
Evaporation Process

Well-crystallized zinc oxide nanonails were grown in a high density by thermal evaporation process and were used as supporting matrixes for glucose oxidase (GOx) immobilization to construct efficient glucose biosensor. The GOx attached to the surfaces of ZnO nanonails had more spatial freedom in its orientation, which facilitated the direct electron transfer between the active sites of immobilized GOx and electrode surface. The fabricated biosensor showed a high sensitivity of 24.613 μA cm–2 mM–1 with a response time less than 10 s. Moreover, it shows a linear range from 0.1 to 7.1 mM with a correlation coefficient of R = 0.9937 and detection limit of 5 μM.

scholarly journals Porous Polydimethylsiloxane Elastomer Hybrid with Zinc Oxide Nanowire for Wearable, Wide-Range, and Low Detection Limit Capacitive Pressure Sensor

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 256
Author(s):  
Gen-Wen Hsieh ◽  
Liang-Cheng Shih ◽  
Pei-Yuan Chen
Keyword(s):  
Zinc Oxide ◽  
Detection Limit ◽  
Pressure Sensor ◽  
Dielectric Layer ◽  
Water Pressure ◽  
Capacitive Pressure Sensor ◽  
Wide Range ◽  
Zinc Oxide Nanowire ◽  
Polydimethylsiloxane Elastomer ◽  
Nanocomposite Dielectric

We propose a flexible capacitive pressure sensor that utilizes porous polydimethylsiloxane elastomer with zinc oxide nanowire as nanocomposite dielectric layer via a simple porogen-assisted process. With the incorporation of nanowires into the porous elastomer, our capacitive pressure sensor is not only highly responsive to subtle stimuli but vigorously so to gentle touch and verbal stimulation from 0 to 50 kPa. The fabricated zinc oxide nanowire–porous polydimethylsiloxane sensor exhibits superior sensitivity of 0.717 kPa−1, 0.360 kPa−1, and 0.200 kPa−1 at the pressure regimes of 0–50 Pa, 50–1000 Pa, and 1000–3000 Pa, respectively, presenting an approximate enhancement by 21−100 times when compared to that of a flat polydimethylsiloxane device. The nanocomposite dielectric layer also reveals an ultralow detection limit of 1.0 Pa, good stability, and durability after 4000 loading–unloading cycles, making it capable of perception of various human motions, such as finger bending, calligraphy writing, throat vibration, and airflow blowing. A proof-of-concept trial in hydrostatic water pressure sensing has been demonstrated with the proposed sensors, which can detect tiny changes in water pressure and may be helpful for underwater sensing research. This work brings out the efficacy of constructing wearable capacitive pressure sensors based on a porous dielectric hybrid with stress-sensitive nanostructures, providing wide prospective applications in wearable electronics, health monitoring, and smart artificial robotics/prosthetics.

Extraction and identification of fillers and pigments from pyrolyzed rubber and tire samples

1996 ◽  
Vol 54 ◽  
pp. 174-175
Author(s):  
P. Sadhukhan ◽  
J. B. Zimmerman
Keyword(s):  
Zinc Oxide ◽  
Electron Microscope ◽  
Carbon Black ◽  
Natural Rubber ◽  
Transmission Electron Microscope ◽  
Rolling Resistance ◽  
Synthetic Polymers ◽  
Nitrogen Atmosphere ◽  
Transmission Electron ◽  
Curing Agents

Rubber stocks, specially tires, are composed of natural rubber and synthetic polymers and also of several compounding ingredients, such as carbon black, silica, zinc oxide etc. These are generally mixed and vulcanized with additional curing agents, mainly organic in nature, to achieve certain “designing properties” including wear, traction, rolling resistance and handling of tires. Considerable importance is, therefore, attached both by the manufacturers and their competitors to be able to extract, identify and characterize various types of fillers and pigments. Several analytical procedures have been in use to extract, preferentially, these fillers and pigments and subsequently identify and characterize them under a transmission electron microscope.Rubber stocks and tire sections are subjected to heat under nitrogen atmosphere to 550°C for one hour and then cooled under nitrogen to remove polymers, leaving behind carbon black, silica and zinc oxide and 650°C to eliminate carbon blacks, leaving only silica and zinc oxide.

Analysis of Sputtered Zinc Oxide Films

1980 ◽  
Vol 38 ◽  
pp. 416-417
Author(s):  
T. A. Emma ◽  
M. P. Singh
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Piezoelectric Materials ◽  
Oxide Films ◽  
Optical Quality ◽  
Zno Films ◽  
Rf Power ◽  
X Ray Diffraction ◽  
Sputtered Films ◽  
Zinc Oxide Films

Optical quality zinc oxide films have been characterized using reflection electron diffraction (RED), replication electron microscopy (REM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Significant microstructural differences were observed between rf sputtered films and planar magnetron rf sputtered films. Piezoelectric materials have been attractive for applications to integrated optics since they provide an active medium for signal processing. Among the desirable physical characteristics of sputtered ZnO films used for this and related applications are a highly preferred crystallographic texture and relatively smooth surfaces. It has been found that these characteristics are very sensitive to the type and condition of the substrate and to the several sputtering parameters: target, rf power, gas composition and substrate temperature.

Properties of Transparent Conductive Zinc Oxide Films Deposited on COP Substrates by PLD Method

2009 ◽  
Vol 129 (11) ◽  
pp. 1981-1984
Author(s):  
Yuki Ueno ◽  
Takanori Aoki ◽  
Akio Suzuki ◽  
Tatsuhiko Matsushita ◽  
Masahiro Okuda
Keyword(s):  
Zinc Oxide ◽  
Oxide Films ◽  
Zinc Oxide Films
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