Enhancement of NH3 Gas Sensitivity at Room Temperature by Carbon Nanotube-Based Sensor Coated with Co Nanoparticles

Nguyen, Le-Minh; Phan, Pho Quoc; Duong, Huyen Ngoc; Nguyen, Chien Duc; Nguyen, Lam Huu

doi:10.3390/s130201754

Cited by 112 publications

(65 citation statements)

References 20 publications

(18 reference statements)

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“…14) Our previous investigation showed that a pristine CNTbased sensor is sensitive to NH 3 at room temperature and has a selective response to NH 3 gas than to alcohol or liquefied petroleum gas (LPG). 14) However, the response of the pristine CNT-based sensor in the previous study was about 1.5% to 70 ppm NH 3 . The CNTs were functionalized with Ag and Pt NPs in the present work to enhance sensor sensitivity.…”

Section: Resultsmentioning

confidence: 99%

Pt- and Ag-Decorated Carbon Nanotube Network Layers for Enhanced NH<sub>3</sub> Gas Sensitivity at Room Temperature

et al. 2015

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Multi-walled carbon nanotubes (CNTs) were directly grown on alumina substrates patterned with Pt interdigitated electrodes by chemical vapor deposition method to fabricate gas sensor. Pt and Ag thin layers with nominal thicknesses of 2 and 4 nm were coated on the CNT layer by evaporation method to modify the CNT properties. The gas sensing results showed that the CNT/Pt-and CNT/Ag-based sensors exhibited enhanced sensitivity to NH 3 gas at room temperature. The responses of the CNT/Pt (3.0%) and CNT/Ag (6.9%) sensors with a 4 nm thick metallic layer to 70 ppm NH 3 were higher than that of pristine CNT sensor (1.5%).

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Section: Resultsmentioning

confidence: 99%

Pt- and Ag-Decorated Carbon Nanotube Network Layers for Enhanced NH<sub>3</sub> Gas Sensitivity at Room Temperature

et al. 2015

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“…The presence of large amounts of amine on the surface of antibodies permitted their intermolecular con-jugation with the carboxylated CNFs on NMBs through an amidation process [19] [20]. Sandwiched conjugation of IgG/anti-IgG/IgG-FITC with NMBs generated fluorescence signals proving successful conjugation of NMBIgG (Figure 1(b)).…”

Section: Preparation Of Nmbs and Antibody Conjugationmentioning

confidence: 99%

Achieving Ultra-Low Detection Limit Using Nanofiber Labels for Rapid Disease Detection

Gikunoo¹,

Abera²,

Woldesenbet³

2014

AID

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Early diagnosis of diseases is critical in its effective management. Traditional disease detection methods require specialized equipment and trained personnel. With the introduction of rapid diagnostic test kits (RDTs), disease detection has become easier and faster. However, these RDTs have failed to compete with the specialized laboratory equipment due to their high detection limits and false alarm rates. This paper presents a novel method of using carbon nanofibers (CNFs) grown on glass microballoons (NMBs) to achieve ultra-low detection limits in RDTs. The NMBs have millions of nanosized CNFs grown on each microballoon, with each CNF having a strong bonding affinity for antibodies. The NMBs conjugated with secondary antibodies have therefore a significantly higher probability of capturing minute antigen concentrations in solution. Furthermore, the dark color formation at the capture zone makes visual disease detection possible. Human Immunoglobulin G (IgG) was selected as the model analyte to study the performance of NMBs using a sandwich immunoassay protocol. Ultra-low electrical detection limit of (4 pg/ml) and rapid response (~1 minute) was achieved using this method.

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“…Lee et al 44 studied the sensing properties of gold nanoparticle decorated CNT as flexible and transparent ammonia gas sensor and found a high recovery time. Nguyen et al 45 studied ammonia sensing by CNT decorated with cobalt nanoparticle at room temperature and found response time 30-50 s with recovery time of 200 s. Tran et al 46 also studied graphene-silver nanowire composite for ammonia sensing and found high response time of 200 s and recovery time 60 s with the purging of the inert gas argon instead of air. Johnson et al 47 reported ammonia sensing of the CNT, graphitic nanoribbon film and found recovery time of 90, 115 s, respectively.…”

Section: Articlementioning

confidence: 99%

Structural, Field Emission and Ammonia Gas Sensing Properties of Multiwalled Carbon Nanotube-Graphene Like Hybrid Films Deposited by Microwave Plasma Enhanced Chemical Vapor Deposition Technique

Bisht¹,

Chockalingam²,

Panwar³

et al. 2015

sci adv mater

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This paper reports the direct deposition of multiwalled carbon nanotube (MWCNT)-graphene like hybrid films on nickel substrate using a 2.45 GHz microwave plasma enhanced chemical vapor deposition (MW PECVD) system in the temperature range of 500-700 C at 20 Torr pressure. The films have been characterized by Raman spectra, high resolution transmission electron microscope (HRTEM), scanning electron microscope, high resolution X-ray diffraction and contact angle measurement. Raman spectroscopy and HRTEM reveal the formation of MWCNT and graphene like hybrid carbon sheet structures. The effect of processing temperature on the field emission properties of MWCNT-graphene like hybrid films has been investigated. Field emission measurement reveals that the turn-on field decrease and the emission current density increase with the increase of deposition temperature. The rambutan structure of MWCNT formed at 700 C is responsible for the improvement in the field emission properties. The film deposited at 700 C shows fast response and recovery time of 40 and 96 s, respectively, for ammonia gas sensing due to the high surface area of the film. It has also been found that the hydrophobic surface of the film helps to perform the gas sensing in the humid environment.

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Enhancement of NH3 Gas Sensitivity at Room Temperature by Carbon Nanotube-Based Sensor Coated with Co Nanoparticles

Cited by 112 publications

References 20 publications

Pt- and Ag-Decorated Carbon Nanotube Network Layers for Enhanced NH<sub>3</sub> Gas Sensitivity at Room Temperature

Pt- and Ag-Decorated Carbon Nanotube Network Layers for Enhanced NH<sub>3</sub> Gas Sensitivity at Room Temperature

Achieving Ultra-Low Detection Limit Using Nanofiber Labels for Rapid Disease Detection

Structural, Field Emission and Ammonia Gas Sensing Properties of Multiwalled Carbon Nanotube-Graphene Like Hybrid Films Deposited by Microwave Plasma Enhanced Chemical Vapor Deposition Technique

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