A Sensitive Formaldehyde Sensor Based on Cataluminescence Coupled with Thermal Desorption

2014 ◽  
Vol 670-671 ◽  
pp. 1163-1166 ◽  
Author(s):  
Hong Wei Yang ◽  
Zheng Xing ◽  
Kao Wen Zhou
Keyword(s):  
Detection Limit ◽  
Thermal Desorption ◽  
Flow Rate ◽  
Active Carbon ◽  
Room Temperature ◽  
High Selectivity ◽  
Formaldehyde In Air ◽  
Benzene Toluene ◽  
Versus Concentration

A sensitive cataluminescence-based detecting technology using nanosized Mo4V6Ti10O47 as a probe was proposed for determination of formaldehyde in air. Trace formaldehyde was firstly absorbed on active carbon at room temperature to concentrate, then desorbed at 75°C to determine. The method showed high selectivity to formaldehyde at wavelength of 575nm, satisfying activity at temperature of 260°C and good stability at carrier flow rate of 145 ml/min. The linear range of CTL intensity versus concentration of formaldehyde was 0.04~78 mg/m3, and the detection limit (3σ) was 0.02 mg/m3. The recovery of artificial sample was 96.8%-103.4% by this method. There was no response to CO, CO2, SO2, NH3, methanol, ethanol, benzene, toluene and xylenes.

A Rapid and Sensitive Ether Sensor Utilizing Thermal Desorption Coupled with Cataluminescence

2013 ◽  
Vol 641-642 ◽  
pp. 238-241 ◽  
Author(s):  
Zhi Gang Cui ◽  
Shao Tong Zhang ◽  
Jin Zhao ◽  
Kao Wen Zhou
Keyword(s):  
Detection Limit ◽  
Gas Sensor ◽  
Thermal Desorption ◽  
Flow Rate ◽  
Active Carbon ◽  
Room Temperature ◽  
High Selectivity ◽  
Direct Determination ◽  
Versus Concentration

A rapid and sensitive cataluminescence (CTL)-based gas sensor using nanosized Y2Zr1.5O6 as a probe was proposed for direct determination of ether in air. Trace ether was firstly absorbed on active carbon at room temperature to concentrate, then desorbed at 65°C to determine. The sensor showed high selectivity to ether at wavelength of 510nm, satisfying activity at temperature of 310°C and good stability at carrier flow rate of 110 ml/min. The linear range of CTL intensity versus concentration of ether was 2~100 mg/m3, and the detection limit (3σ) was 1.1 mg/m3. The recovery of artificial sample was 95.4%—106.7% by this method. The response to formaldehyde, benzene, NH3 and ethanol was insignificant, and there was no response to SO2, CO and acetone. The technique is a convenient and fast way of determining ether in air.

A Rapid and Sensitive Acetone Gas Sensor Utilizing Thermal Desorption Coupled with Cataluminescence on Nano-Cr4TiO8

2012 ◽  
Vol 468-471 ◽  
pp. 217-220 ◽  
Author(s):  
Kao Wen Zhou ◽  
Xin Li ◽  
Di Su ◽  
Hui Zhu Yang ◽  
Xu Shen
Keyword(s):  
Detection Limit ◽  
Gas Sensor ◽  
Thermal Desorption ◽  
Flow Rate ◽  
Active Carbon ◽  
Room Temperature ◽  
High Selectivity ◽  
Direct Determination ◽  
Versus Concentration

A rapid and sensitive cataluminescence (CTL)-based gas sensor using nanosized Cr4TiO8 as a probe was proposed for direct determination of acetone in air. Trace acetone was firstly absorbed on active carbon at room temperature to concentrate, then desorbed at 84°C to determine. The sensor showed high selectivity to acetone at wavelength of 430nm, satisfying activity at temperature of 366°C and good stability at carrier flow rate of 115 ml/min. The linear range of CTL intensity versus concentration of acetone was 2.5~150 mg/m3, and the detection limit (3σ) was 1.2 mg/m3. The recovery of artificial sample was 94.1%—106.2% by this method. The response to formaldehyde and ethanol was insignificant, and there was no response to SO2, CO and benzene.

A Novel Ammonia Sensor Utilizing Cataluminescence on Nano-TiW3Cr2O14

2011 ◽  
Vol 694 ◽  
pp. 184-188 ◽  
Author(s):  
Kao Wen Zhou ◽  
Zi Qiao Zhang ◽  
Li Jing Xing ◽  
Xin Li ◽  
Chun Xue Fu
Keyword(s):  
Detection Limit ◽  
Flow Rate ◽  
Active Carbon ◽  
Room Temperature ◽  
High Selectivity ◽  
Direct Determination ◽  
Ammonia Sensor ◽  
On Line ◽  
Versus Concentration

A new sensor based on cataluminescence (CTL) produced on the surface of nanosized TiW3Cr2O14 was demonstrated for direct determination of ammonia in air. Trace ammonia was firstly absorbed on active carbon at room temperature to concentrate, then desorbed at 105°C to determine. The sensor showed high selectivity to ammonia at wavelength of 540 nm, satisfying activity at temperature of 275°C and good stability at air carrier flow rate of 115 ml/min. The linear range of CTL intensity versus concentration of ammonia was 1.0~50 mg/m3 (γ=0.9990), and the detection limit (3σ) was 0.5 mg/m3. The recovery of artificial sample was 97.45%—102.73% by this method. There was no response to benzene, SO2, CO and formaldehyde, and insignificant response to ethanol. This gas sensor allows on-line monitoring of ammonia in air.

A Cataluminescence-Based Sensor for Detecting Benzene, Toluene and Xylene Vapors Utilizing the Catalytic Reduction on the Surface of Nanosized Al2O3/Pt

2013 ◽  
Vol 663 ◽  
pp. 335-342 ◽  
Author(s):  
Ni Jing Wang ◽  
Xiao An Cao ◽  
Rui Wen He ◽  
Yong Hui Liu ◽  
Yi Jun Huang
Keyword(s):  
Detection Limit ◽  
Gas Sensor ◽  
Flow Rate ◽  
High Selectivity ◽  
Catalytic Reduction ◽  
Optimal Conditions ◽  
Ctl Response ◽  
Carrier Gas ◽  
Benzene Toluene ◽  
Nanosized Catalyst

A new gas sensor was designed based on cataluminescence (CTL) by using catalytic reduction of benzene, toluene and xylene (BTEX) on the surface of nanosized catalyst Al2O3/Pt with hydrogen as the carrier gas. The result indicated that the sensor showed strong CTL response, high selectivity and excellent durability under optimal conditions: Al2O3/Pt (1%), the temperature of 395oC, the wavelength of 425 nm and the flow rate of 270 mL/min. The detection limit (3σ) is 0.2 ppm for benzene, 0.3 ppm for toluene and xylene. Other corresponding substances such as methanol, ethanol, formaldehyde, acetaldehyde, ethylacetate, ammonia and trichloromethane had no or less interference. It is a simple and convenient sensor with good selectivity and sensitivity for detecting BTEX.

Real-Time Monitoring of Hydrogen Sulfide in Air by Cataluminescence-Based Gas Sensor

2012 ◽  
Vol 241-244 ◽  
pp. 934-937 ◽  
Author(s):  
Kao Wen Zhou ◽  
Hong Wei Yang ◽  
Xu Fei Li ◽  
Yan Ying Yang
Keyword(s):  
Carbon Monoxide ◽  
Hydrogen Sulfide ◽  
Detection Limit ◽  
Real Time ◽  
Gas Sensor ◽  
High Selectivity ◽  
Real Time Monitoring ◽  
Sensing Material ◽  
Versus Concentration

A cataluminescence (CTL)-based gas sensor utilizing nano-sized Mn1.5Zr2O7 as the sensing material for the determination of hydrogen sulfide in air was proposed. The gas sensor showed high selectivity for hydrogen sulfide at 450 nm and satisfying activity at 320°C. The linear range of the CTL intensity versus concentration of hydrogen sulfide was 2~95 mg/m3, and the detection limit (3σ) was 1.5 mg/m3. No interference was observed while the foreign substances, such as formaldehyde, ammonia, ethanol, benzene, carbon monoxide and sulfur dioxide, were passing through the sensor. The gas sensor displayed good stability for continuously introducing hydrogen sulfide over 60 h, and allowed real-time monitoring of hydrogen sulfide in air.

Determination of Trimethylamine in Air by Cataluminescence-Based Gas Sensor

2012 ◽  
Vol 605-607 ◽  
pp. 933-936 ◽  
Author(s):  
Kao Wen Zhou ◽  
Chun Xiu Gu ◽  
Xin Li ◽  
Di Su ◽  
Hui Zhu Yang ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Detection Limit ◽  
Sulfur Dioxide ◽  
Gas Sensor ◽  
High Selectivity ◽  
Linear Range ◽  
Good Stability ◽  
On Line ◽  
Versus Concentration

A sensitive cataluminescence (CTL)-based gas sensor using nano-sized Y2Ti3O9 as a probe was proposed for the determination of trimethylamine (TMA) in air. The gas sensor showed high selectivity for TMA at 490 nm and satisfying activity at 320°C. The linear range of the CTL intensity versus concentration of TMA was 1~70 mg/m3 (γ = 0.995), and the detection limit (3σ) was 0.6 mg/m3. No interference was observed while the foreign substances, such as ammonia, ethanol, benzene, carbon monoxide and sulfur dioxide, were passing through the sensor. The gas sensor displayed good stability for continuously introducing TMA over 100 h, and allowed on-line monitoring of TMA in air.

Real-Time Monitoring of Acetaldehyde in Air by Cataluminescence-Based Gas Sensor

2012 ◽  
Vol 268-270 ◽  
pp. 1594-1597 ◽  
Author(s):  
Kao Wen Zhou ◽  
Chun Xiu Gu ◽  
Dong Ping Ma ◽  
Hui Cao
Keyword(s):  
Carbon Monoxide ◽  
Detection Limit ◽  
Sulfur Dioxide ◽  
Real Time ◽  
Gas Sensor ◽  
High Selectivity ◽  
Real Time Monitoring ◽  
Highly Sensitive ◽  
Versus Concentration

A highly sensitive, simple and selective gas sensor was developed for the determination of trace acetaldehyde in air based on cataluminescence (CTL) on nano-sized Al2Ti2O7. The gas sensor showed high selectivity for acetaldehyde at 515 nm and satisfying activity at 295°C. The linear range of the CTL intensity versus concentration of acetaldehyde was 1~65 mg/m3, and the detection limit (3σ) was 0.5 mg/m3. No interference was observed while the foreign substances, such as ammonia, ethanol, formaldehyde, benzene, carbon monoxide and sulfur dioxide, were passing through the sensor. The gas sensor displayed good stability for continuously introducing 10 mg/m3 acetaldehyde over 60 h, and allowed real-time monitoring of acetaldehyde in air.

Room Temperature Deposition of Silicon Oxynitride Films with Low Stress Using Sputtering-Type Electron Cyclotron Resonance Plasmas

1999 ◽  
Vol 594 ◽  
Author(s):  
D. Gao ◽  
K. Furukawa ◽  
H. Nakashima ◽  
J. Gao ◽  
J. Wang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Thermal Desorption ◽  
Flow Rate ◽  
Cyclotron Resonance ◽  
Room Temperature ◽  
Electron Cyclotron Resonance ◽  
Thermal Desorption Spectroscopy ◽  
Electron Cyclotron ◽  
Silicon Oxynitride ◽  
Intrinsic Stress

AbstractSilicon oxynitride (SiOxNy) films with low stress were deposited successfully at room temperature using sputtering-type electron cyclotron resonance (ECR) plasmas. Films were deposited for a wide range of flow rate ratio of O2 to N2 at a constant Ar flow rate. Film properties were verified by characterizations of refractive index (ellipsometry), structural properties (Fourier transform infrared and Auger electron spectroscopy), intrinsic stress, and barrier strength of water penetration (thermal desorption spectroscopy). A near-stoichiometric SiOxNy (x = 1.44 and y = 0.41) film with low stress could be formed at the optimum deposition condition, under which the SiOxNy film had a refractive index of 1.54. The results of thermal desorption spectroscopy measurements showed that the SiOx Ny film had a higher barrier against moisture penetration relative to deposited SiOx and SiNy films. The SiOxNy film was directly deposited on the organic EL device and the applicability was shown clearly. These results indicate that this SiOxNy film deposited using a sputtering-type ECR plasma has the potential to be utilized as a passivation layer of organic EL devices, which are required to be formed at low temperature.

A highly selective two-photon fluorescent probe for the determination of mercury ions

The Analyst ◽  
2015 ◽  
Vol 140 (9) ◽  
pp. 3285-3289 ◽  
Author(s):  
Fang Liu ◽  
Changqin Ding ◽  
Ming Jin ◽  
Yang Tian
Keyword(s):  
Detection Limit ◽  
Fluorescent Probe ◽  
High Selectivity ◽  
Fluorescent Sensor ◽  
Mercury Ions ◽  
Two Photon ◽  
Specific Recognition ◽  
Low Detection Limit ◽  
Recognition Molecule

A two-photon fluorescent sensor ATD was developed for Hg2+ determination with high selectivity and low detection limit, in which two-photon fluorophore TD was designed and synthesized with a specific recognition molecule for Hg2+ – PT.

Gas Chromatographic Determination of Glucono-δ-Lactone in Foods

1983 ◽  
Vol 66 (6) ◽  
pp. 1532-1534
Author(s):  
Taizo Tsuda ◽  
Hiroshi Nakanishi
Keyword(s):  
Detection Limit ◽  
Room Temperature ◽  
Chromatographic Determination ◽  
Soybean Curd ◽  
Standard Deviations

Abstract A method is described for the gas chromatographic (GC) determination of glucono-δ-lactone in foods. A sample was homogenized with 60-70°C water and filtered. The filtrate was buffered with NH4OHNH4CI pH 10 solution, and was passed through a QAE-Sephadex A25 column. The column was washed with water and glucono-δ-lactone was eluted with 0.1N HC1. An aliquot of the eluate was evaporated to dryness and derivatized with pyridine, N,O-bis(trimethylsilyl)trifluoroacetamide, and trimethylchlorosilane at room temperature. GC separation of glucono-δ-lactone as the TMS derivative was performed on a 2% OV-17 column at 180°C. Recoveries from bread, jelly, soybean curd, and other foods fortified with 0.1% glucono-δ-lactone ranged from 92 to 106%, with standard deviations from 2.2 to 9.8%. The detection limit was approximately 0.025%.

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