Formaldehyde sensing properties of ZnO-based hollow nanofibers

Sensor Review ◽  
2014 ◽  
Vol 34 (3) ◽  
pp. 327-334 ◽  
Author(s):  
Shaohong Wei ◽  
Youjuan Zhang ◽  
Meihua Zhou
Keyword(s):  
Low Cost ◽  
High Sensitivity ◽  
Diffraction Field ◽  
Formaldehyde Concentration ◽  
Hollow Nanofibers ◽  
Content Type ◽  
Sensing Properties ◽  
Electrospinning Method ◽  
Formaldehyde Sensing ◽  
Hollow Nanofiber

Purpose – The purpose of this paper is to synthesize SnO2–ZnO hollow nanofibers, study their sensing properties and introduce an attractive candidate for formaldehyde detection in practice. Design/methodology/approach – Pure and SnO2–ZnO hollow nanofibers were synthesized by electrospinning method and characterized via X-ray diffraction, field-emission scanning electron microscopy and Fourier transform infrared spectroscopy. The formaldehyde-sensing properties were investigated. Findings – The optimum performance was obtained at 260°C by the 14 at.% SnO2–ZnO hollow nanofiber sensor. The sensor could detect formaldehyde down to 0.1 ppm with rapid response–recovery time (4-6 s and 7-9 s, respectively), high sensitivity, good selectivity and stability. The relationship between the sensor’s sensitivity and formaldehyde concentration suggests that the adsorbed oxygen species on the sensor’s surface is O2−. The prominent sensing properties are attributed to the one dimensional hollow nanofiber structures and the promoting effects of SnO2. Practical implications – The sensor fabricated from 14 at.% SnO2–ZnO fibers exhibits excellent formaldehyde-sensing characteristics. It can be used for formaldehyde detection in practice. Social implications – The electrospinning method is a very simple and convenient method for fabricating hollow nanofibers and the sensing material is of low cost. Originality/value – To the best of the authors’ knowledge, studies on formaldehyde sensing of SnO2–ZnO hollow nanofibers have not been reported before.

Prepare and Formaldehyde Sensing Properties of Hollow Nanofibers In2O3

2014 ◽  
Vol 941-944 ◽  
pp. 479-482
Author(s):  
Chang Bai Liu ◽  
Xing Yi Liu
Keyword(s):  
Operating Temperature ◽  
Optimum Operating ◽  
Hollow Nanofibers ◽  
Optimum Operating Temperature ◽  
X Ray ◽  
Sensing Properties ◽  
Response And Recovery ◽  
Formaldehyde Sensing ◽  
Hollow Nanofiber ◽  
Synthesized Materials

Hollow nanofiber In2O3 is synthesized by electrospinning. The as-synthesized materials are characterized by scanning electron microscope (SEM) and X-ray power diffraction (XRD). The formaldehyde sensing properties of the devices using In2O3 films are investigated at different operating temperatures. The results reveal that the response of hollow nanofiber In2O3 sensor is about 2.5 to 1 ppm formaldehyde at the optimum operating temperature of 270°C. The response and recovery time is about 3 s and 19 s, respectively. Moreover, sensor possesses a good selectivity to some common gas.

Modern nanobiotechnologies for efficient detection and remediation of mercury

Sensor Review ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mulayam Singh Gaur ◽  
Rajni Yadav ◽  
Mamta Kushwah ◽  
Anna Nikolaevna Berlina
Keyword(s):  
Heavy Metals ◽  
Water Samples ◽  
Low Cost ◽  
High Sensitivity ◽  
Environmental Water ◽  
Mercury Ions ◽  
Content Type ◽  
Efficient Detection ◽  
Sensitivity And Selectivity ◽  
Selection Of

Purpose This information will be useful in the selection of materials and technology for the detection and removal of mercury ions at a low cost and with high sensitivity and selectivity. The purpose of this study is to provide the useful information for selection of materials and technology to detect and remove the mercury ions from water with high sensitivity and selectivity. The purpose of this study is to provide the useful information for selection of materials and technology to detect and remove the mercury ions from water with high sensitivity and selectivity. Design/methodology/approach Different nano- and bio-materials allowed for the development of a variety of biosensors – colorimetric, chemiluminescent, electrochemical, whole-cell and aptasensors – are described. The materials used for their development also make it possible to use them in removing heavy metals, which are toxic contaminants, from environmental water samples. Findings This review focuses on different technologies, tools and materials for mercury (heavy metals) detection and remediation to environmental samples. Originality/value This review gives up-to-date and systemic information on modern nanotechnology methods for heavy metal detection. Different recognition molecules and nanomaterials have been discussed for remediation to water samples. The present review may provide valuable information to researchers regarding novel mercury ions detection sensors and encourage them for further research/development.

scholarly journals Preparation of Cd-Loaded In2O3Hollow Nanofibers by Electrospinning and Improvement of Formaldehyde Sensing Performance

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Ruijin Hu ◽  
Jing Wang ◽  
Pengpeng Chen ◽  
Yuwen Hao ◽  
Chunli Zhang ◽  
...  
Keyword(s):  
Molar Ratio ◽  
Formaldehyde Concentration ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molar Ratios ◽  
Grain Sizes ◽  
Transmission Electron ◽  
Electrospinning Method ◽  
Formaldehyde Sensing ◽  
Small Grains

Pure In2O3and Cd-loaded In2O3hollow and porous nanofibers with different Cd/In molar ratios (1/20, 1/10, 1/1) were synthesized by electrospinning method. X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), and transmission electron microscopy (TEM) were used to characterize the nanofibers. The porous nanofibers were composed of small grains. The average grain sizes and the diameters of Cd-loaded In2O3nanofibers increased with the increasing of Cd/In molar ratios. The formaldehyde sensing properties of the sensors based on pure In2O3and Cd-loaded In2O3nanofibers were investigated in formaldehyde concentration range of 0.5∼100 ppm. Moreover, the selectivity of those sensors was studied by testing responses to methanol, toluene, ethanol, acetone, and ammonia. The result showed that Cd-loaded In2O3nanofibers with Cd/In molar ratio of 1/10 possessed the highest response value and good selectivity at operating temperature 280°C. In addition, the formaldehyde sensing mechanism of the sensors based on Cd-loaded nanofibers was briefly analyzed.

scholarly journals Colorimetric pad for low-concentration formaldehyde monitoring in indoor air

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Watcharaporn Wongsakoonkan ◽  
Sumate Pengpumkiat ◽  
Vorakamol Boonyayothin ◽  
Chaiyanun Tangtong ◽  
Wisanti Laohaudomchok ◽  
...  
Keyword(s):  
Shelf Life ◽  
Indoor Air ◽  
Low Cost ◽  
Formaldehyde Concentration ◽  
Color Intensity ◽  
Direct Reading ◽  
Content Type ◽  
Low Concentration ◽  
Time Accuracy ◽  
User Friendly

PurposeThe purpose of this study was to develop an accurate, selective, low-cost and user-friendly colorimetric pad to detect formaldehyde at low concentration.Design/methodology/approach1-phenyl-1,3-butanedione, a reactive chemical, was selected to develop the colorimetric pad for indoor air formaldehyde measurement. Silica nanoparticle impregnated with the reactive chemical was coated on the cellulose filter surface to increase the reactive site. A certified formaldehyde permeation tube was used to generate six varied concentrations between 0.01 and 0.10 ppm in a test chamber. The color intensity on the pads was measured using an image processing program to produce a formaldehyde concentration reading chart. The colorimetric pad was tested for optimum reaction time, accuracy, precision, stability, selectivity and shelf life.FindingsThe color of the pads changed from white to yellow and the color intensity varied with the concentrations and appeared to be stable after exposure to formaldehyde for 8 hours. At room temperature, the stability of the pad was 7 days, and shelf life was 120 days. The accuracy, precision and bias of the pad were 12.38%, 0.032 and 6.0%, respectively. Carbonyl compounds, benzene and toluene did not interfere with the reading of this developed colorimetric pad.Originality/valueThe developed colorimetric pad meets NIOSH's criteria for an overall accuracy of ±25%, bias = 10%. They were accurate at low concentrations, user-friendly and had low cost compared to an electronic direct reading instrument (cost of chemicals and materials was 21.50 Bath or 0.69 USD per piece) so that favorable for the use of general people for health protection.

scholarly journals Synthesis and high formaldehyde sensing properties of quasi two-dimensional mesoporous ZnSnO3 nanomaterials

RSC Advances ◽  
2019 ◽  
Vol 9 (26) ◽  
pp. 14809-14816 ◽  
Author(s):  
Bingshan Wang ◽  
Jinbao Yu ◽  
Xiaohong Li ◽  
Jun Yin ◽  
Meng Chen
Keyword(s):  
High Sensitivity ◽  
Two Dimensional ◽  
Sensing Properties ◽  
Formaldehyde Sensing

Quasi two-dimensional mesoporous ZnSnO3 nanomaterials (QTMZNS) were synthesized and the QTMZNS-based sensor exhibited high sensitivity to formaldehyde vapors.

Preparation and characterization of ZnO/CoNiO2 hollow nanofibers by electrospinning method with enhanced gas sensing properties

2017 ◽  
Vol 702 ◽  
pp. 20-30 ◽  
Author(s):  
Khaled Tawfik Alali ◽  
Tie Liu ◽  
Jingyuan Liu ◽  
Qi Liu ◽  
Meriem Amina Fertassi ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Hollow Nanofibers ◽  
Sensing Properties ◽  
Electrospinning Method ◽  
Gas Sensing Properties

scholarly journals Display of Antigens on Polyester Inclusions Lowers the Antigen Concentration Required for a Bovine Tuberculosis Skin Test

2015 ◽  
Vol 23 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Natalie A. Parlane ◽  
Shuxiong Chen ◽  
Gareth J. Jones ◽  
H. Martin Vordermeier ◽  
D. Neil Wedlock ◽  
...  
Keyword(s):  
Skin Test ◽  
Bovine Tuberculosis ◽  
Low Cost ◽  
High Sensitivity ◽  
Content Type ◽  
Environmental Mycobacteria ◽  
Low Concentrations ◽  
Polyhydroxyalkanoate Synthase ◽  
Test Specificity ◽  
Tuberculosis Skin Test

ABSTRACTThe tuberculin skin test is the primary screening test for the diagnosis of bovine tuberculosis (TB), and use of this test has been very valuable in the control of this disease in many countries. However, the test lacks specificity when cattle have been exposed to environmental mycobacteria or vaccinated withMycobacterium bovisbacille Calmette-Guérin (BCG). Recent studies showed that the use of three or four recombinant mycobacterial proteins, including 6-kDa early secretory antigenic target (ESAT6), 10-kDa culture filtrate protein (CFP10), Rv3615c, and Rv3020c, or a peptide cocktail derived from those proteins, in the skin test greatly enhanced test specificity, with minimal loss of test sensitivity. The proteins are present in members of the pathogenicMycobacterium tuberculosiscomplex but are absent in or not expressed by the majority of environmental mycobacteria and the BCG vaccine strain. To produce a low-cost skin test reagent, the proteins were displayed at high density on polyester beads through translational fusion to a polyhydroxyalkanoate synthase that mediates the formation of antigen-displaying inclusions in recombinantEscherichia coli. Display of the proteins on the polyester beads greatly increased their immunogenicity, allowing for the use of very low concentrations of proteins (0.1 to 3 μg of mycobacterial protein/inoculum) in the skin test. Polyester beads simultaneously displaying all four proteins were produced in a single fermentation process. The polyester beads displaying three or four mycobacterial proteins were shown to have high sensitivity for detection ofM. bovis-infected cattle and induced minimal responses in animals exposed to environmental mycobacteria or vaccinated with BCG.

Synthesis and characterization of In-doped LaFeO3 hollow nanofibers with enhanced formaldehyde sensing properties

2019 ◽  
Vol 236 ◽  
pp. 229-232 ◽  
Author(s):  
G.H. Zhang ◽  
Q. Chen ◽  
X.Y. Deng ◽  
H.Y. Jiao ◽  
P.Y. Wang ◽  
...  
Keyword(s):  
Synthesis And Characterization ◽  
Hollow Nanofibers ◽  
Sensing Properties ◽  
Formaldehyde Sensing

scholarly journals Morphology and structure characterization of crystalline SnO2 1D nanostructures

2020 ◽  
Vol 12 (3) ◽  
pp. 70
Author(s):  
Wiktor Matysiak ◽  
Tomasz Tański ◽  
Weronika Monika Smok
Keyword(s):  
Tin Oxide ◽  
Gas Sensing ◽  
Hollow Nanofibers ◽  
One Dimensional ◽  
Sensing Properties ◽  
Sno2 Nanowires ◽  
Electrospinning Method ◽  
Ethanol Sensing ◽  
Sensing Performance

In recent years, many attempts have been made to improve the sensory properties of SnO2, including design of sensors based on one-dimensional nanostructures of this material, such as nanofibers, nanotubes or nanowires. One of the simpler methods of producing one-dimensional tin oxide nanomaterials is to combine the electrospinning method with a sol-gel process. The purpose of this work was to produce SnO2 nanowires using a hybrid electrospinning method combined with a heat treatment process at the temperature of 600 °C and to analyze the morphology and structure of the one-dimensional nanomaterial produced in this way. Analysis of the morphology of composite one-dimensional tin oxide nanostructures showed that smooth, homogeneous and crystalline nanowires were obtained. Full Text: PDF ReferencesN. Dharmaraj, C.H. Kim, K.W. Kim, H.Y. Kim, E.K. Suh, "Spectral studies of SnO2 nanofibres prepared by electrospinning method", Spectrochim. Acta - Part A Mol. Biomol. Spectrosc. 64, (2006) CrossRef N. Gao, H.Y. Li, W. Zhang, Y. Zhang, Y. Zeng, H. Zhixiang, ... & H. Liu, "QCM-based humidity sensor and sensing properties employing colloidal SnO2 nanowires", Sens. Actuators B Chem. 293, (2019), 129-135. CrossRef W. Ge, Y. Chang, V. Natarajan, Z. Feng, J. Zhan, X. Ma, "In2O3-SnO2 hybrid porous nanostructures delivering enhanced formaldehyde sensing performance", J.Alloys and Comp. 746, (2018) CrossRef M. Zhang, Y. Zhen, F. Sun, C. Xu, "Hydrothermally synthesized SnO2-graphene composites for H2 sensing at low operating temperature", Mater. Sci. Eng. B. 209, (2016), 37-44. CrossRef Y. Zhang, X. He, J. Li, Z. Miao, F. Huang, "Fabrication and ethanol-sensing properties of micro gas sensor based on electrospun SnO2 nanofibers", Sens. Actuators B Chem. 132, (2008), 67-73. CrossRef W.Q. Li, S.Y. Ma, J. Luo, Y.Z. Mao, L. Cheng, D.J. Gengzang, X.L. Xu, S H. Yan, "Synthesis of hollow SnO2 nanobelts and their application in acetone sensor", Mater. Lett. 132, (2014), 338-341. CrossRef E. Mudra, I. Shepa, O. Milkovic, Z. Dankova, A. Kovalcikova, A. Annusova, E. Majkova, J. Dusza, "Effect of iron doping on the properties of SnO2 nano/microfibers", Appl. Surf. Sci. 480, (2019), 876-881. CrossRef P. Mohanapriya, H. Segawa, K. Watanabe, K. Watanabe, S. Samitsu, T.S. Natarajan, N.V. Jaya, N. Ohashi, "Enhanced ethanol-gas sensing performance of Ce-doped SnO2 hollow nanofibers prepared by electrospinning", Sens. Actuators B Chem. 188, (2013), 872-878. CrossRef W.Q. Li, S.Y. Ma, Y.F. Li, X.B. Li, C.Y. Wang, X.H. Yang, L. Cheng, Y.Z. Mao, J. Luo, D.J. Gengzang, G.X. Wan, X.L. Xu, "Preparation of Pr-doped SnO2 hollow nanofibers by electrospinning method and their gas sensing properties", J.Alloys and Comp. 605, (2014), 80-88. CrossRef X.H. Xu, S.Y. Ma, X.L. Xu, T. Han, S.T. Pei, Y. Tie, P.F. Cao, W.W. Liu, B.J. Wang, R. Zhang, J.L. Zhang, "Ultra-sensitive glycol sensing performance with rapid-recovery based on heterostructured ZnO-SnO2 hollow nanotube", Mater. Lett, 273, (2020), 127967. CrossRef F. Li, X. Gao, R. Wang, T. Zhang, G. Lu, Sens. "Study on TiO2-SnO2 core-shell heterostructure nanofibers with different work function and its application in gas sensor", Actuators B Chem, 248, (2017), 812-819. CrossRef S. Bai, W. Guo, J. Sun, J. Li, Y. Tian, A. Chen, R. Luo, D. Li, "Synthesis of SnO2–CuO heterojunction using electrospinning and application in detecting of CO", Sens Actuators B Chem, 226, (2016), 96-103. CrossRef H. Du, P.J. Yao, Y. Sun, J. Wang, H. Wang, N. Yu, "Electrospinning Hetero-Nanofibers In2O3/SnO2 of Homotype Heterojunction with High Gas Sensing Activity", Sensors, 17, (2017), 1822. CrossRef X. Wang, H. Fan, P. Ren, "Electrospinning derived hollow SnO2 microtubes with highly photocatalytic property", Catal. Commun. 31, (2013), 37-41. CrossRef L. Cheng, S.Y. Ma, T.T. Wang, X.B. Li, J. Luo, W.Q. Li, Y.Z. Mao, D.J Gengzang, "Synthesis and characterization of SnO2 hollow nanofibers by electrospinning for ethanol sensing properties", Mater. Lett. 131, (2014), 23-26. CrossRef P.H. Phuoc, C.M. Hung, N.V. Toan, N.V. Duy, N.D. Hoa, N.V. Hieu, "One-step fabrication of SnO2 porous nanofiber gas sensors for sub-ppm H2S detection", Sens. Actuators A Phys. 303, (2020), 111722. CrossRef A.E. Deniz, H.A. Vural, B. Ortac, T. Uyar, "Gold nanoparticle/polymer nanofibrous composites by laser ablation and electrospinning", Matter. Lett. 65, (2011), 2941-2943. CrossRef S. Sagadevan, J. Podder, "Investigation on Structural, Surface Morphological and Dielectric Properties of Zn-doped SnO2 Nanoparticles", Mater. Res. 19, (2016), 420-425. CrossRef

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