Synthesis and application of graphene–silver nanowires composite for ammonia gas sensing

Tran, Quang Trung; Huynh, Tran My Hoa; Tong, Duc Tai; Tran, Van Tam; Nguyen, Nang Dinh

doi:10.1088/2043-6262/4/4/045012

Cited by 27 publications

(15 citation statements)

References 6 publications

(13 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, Katkov et al [45] created a fluorine-functionalized graphene sensor and reached 10.2% response to 10000 ppm of ammonia. The response 3-4% for 0.1% (1000 ppm) NH 3 in Ar was obtained on reduced graphene oxide-silver nanowires [48].…”

Section: Influence Of the Operating Temperature On Nfc Filmmentioning

confidence: 99%

Enhanced Ammonia Adsorption on Directly Deposited Nanofibrous Carbon Films

et al. 2018

View full text Add to dashboard Cite

The ammonia adsorption on the nanostructured carbon thin film was significantly influenced by the choice of deposition temperature and deposition time of thin film synthesis. The thin films were prepared on Si/SiO2 substrates by chemical vapour deposition in Ar/C2H2 gas mixture using iron catalytic nanoparticles. The analysis of the grown layer by the scanning and transmission electron microscopy showed the transition from long multiwalled nanotubes (MWCNTs) to bamboo-like hollow carbon nanofiber structure with the decrease of the deposition temperature from 700 to 600°C. Further, the material was analyzed by energy-dispersive X-ray spectroscopy and Raman spectroscopy confirmed the transition from graphitic sp2 structure to highly defective structure at lower deposition temperature. The resistance of the prepared layer strongly depends on deposition temperature (Td) and deposition time (td). High resistance layer, 38.6 kΩ, was formed at Td 600°C and td 10 min, while at Td 700°C and td 60 min, the resistance decreased to 860 ohms. Such behaviour is consistent with MWCNTs being responsible for the formation of the conductive network. Such system was studied using chemiresistor ammonia gas sensor configuration. The sensor resistance increased when exposed to ammonia in all the cases, but their response varied considerably. A decrease in deposition time, from 60 to 10 min, and the deposition temperature, from 700 to 600°C, led to the 10-fold increase in the sensor response. The measurements carried out at room temperature showed the higher sensor response than the measurements carried out at 200°C. This behaviour can be explained by the change in adsorption-desorption equilibrium at different temperatures. Analysis of dependence of the sensor response on the ammonia concentration proved that the underlying resistance change mechanism is chemisorption of ammonia molecules on the carbon network corresponding to the Langmuir isotherm.

show abstract

Section: Influence Of the Operating Temperature On Nfc Filmmentioning

confidence: 99%

Enhanced Ammonia Adsorption on Directly Deposited Nanofibrous Carbon Films

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The adsorption process is controlled by insertion of water vapor, while the desorption process was done by extraction of the vapor followed by insertion of dry gaseous Ar. The measurement system that was described in [21] consists of an Ar gas tank, gas/vapor hoses and solenoids system, two flow meters, a bubbler with vapor solution, and an airtight test chamber connected with collect-store data DAQ component. The Ar gas played a role as carrier gas, dilution gas, and purge gas.…”

Section: Characterization Techniquesmentioning

confidence: 99%

Synthesis and Characterization of Polymeric Graphene Quantum Dots Based Nanocomposites for Humidity Sensing

Long

Định

Trung

2016

Journal of Nanomaterials

View full text Add to dashboard Cite

Graphene quantum dots (GQDs) were synthesized and incorporated with polyethylenedioxythiophene:poly(4-styrenesulfonate) (PEDOT:PSS) and carbon nanotube (CNT) to form a composite that can be used for humidity sensors. The 600 nm thick composite films contained bulk heterojunctions of CNT/GQD and CNT/PEDOT:PSS. The sensors made from the composites responded well to humidity in a range from 60 to 80% at room temperature and atmospheric pressure. With a CNT content of 0.4 wt.% (GPC-1) to 0.8 wt.% (GPC-2) and 1.2 wt.% (GPC-3), the sensitivity of the humidity sensing devices based on CNT-doped graphene quantum dot-PEDOT:PSS composites was increased from 4.5% (GPC-1) to 9.0% (GPC-1) and 11.0% (GPC-2), respectively. The fast response time of the GPC sensors was about 20 s and it was much improved due to CNTs doping in the composites. The best value of the recovery time was found to be of 40 s, for the GPC composite film doped with 1.2 wt.% CNT content.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Synthesis and application of graphene–silver nanowires composite for ammonia gas sensing

Cited by 27 publications

References 6 publications

Enhanced Ammonia Adsorption on Directly Deposited Nanofibrous Carbon Films

Enhanced Ammonia Adsorption on Directly Deposited Nanofibrous Carbon Films

Synthesis and Characterization of Polymeric Graphene Quantum Dots Based Nanocomposites for Humidity Sensing

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

Contact Info

Product

Resources

About