Hollow carbon spheres and a hollow carbon sphere/polyvinylpyrrolidone composite as ammonia sensors

Mutuma, Bridget K.; Rodrigues, Rafael; Ranganathan, K.; Matsoso, Boitumelo J.; Wamwangi, Daniel; Hümmelgen, Ivo A.; Coville, Neil J.

doi:10.1039/c6ta09424d

Cited by 42 publications

(37 citation statements)

References 93 publications

(94 reference statements)

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“…[17] Second, there is electron transfer from the polymer matrix to CNTs as revealed by the band alignment between CNT and PS-b-P4VP (for more details,s ee the Supporting Information, Figure S11). Furthermore,the lone pair of electrons from the exposed vapors interacts with the CNT surface and transfers electrons to CNT,f urther enhancing the conductivity of the sensor [18] implying that protonic coupled with electronic conduction is the dominant mechanism in case of CNT-PSb-P4VP sensors.T his is consistent with our observations that pristine PS-b-P4VP sensors have lower sensitivity and are significantly slower compared to CNT-PS-b-P4VP.W ea lso fabricated humidity sensors with only CNTs and found that the resistance change is minor which first decreases and then increases with humidity change (Supporting Information, Figure S12). This can be attributed to the low cross-linking of CNTs,a sr eported elsewhere.…”

Section: Angewandte Chemiementioning

confidence: 99%

Embedding 1D Conducting Channels into 3D Isoporous Polymer Films for High‐Performance Humidity Sensing

et al. 2018

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Isoporous block copolymer (BCP) films have received exponential interest as highly selective membranes, stemming from their unique morphological features, but their applications in functional devices remain to be realized. Now single-walled carbon nanotubes (CNTs) were efficiently incorporated into isoporous block copolymer films for chemiresistive sensing at room temperature. Leveraging the efficient charge extraction ability of CNTs together with nanochannel arrays aligned perpendicular to the surface of the films, an ultrafast response time of 0.3 s was achieved for humidity detection with a sensor response of about 800 on changing humidity from 10 % to 95 %. Furthermore, the sensor also responds to various organic vapors, underscoring its promising detection capability.

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Section: Angewandte Chemiementioning

confidence: 99%

Embedding 1D Conducting Channels into 3D Isoporous Polymer Films for High‐Performance Humidity Sensing

et al. 2018

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“…Among the carbonaceous materials, carbon nanotubes and graphene are the most employed in the electrochemical sensors and biosensors development, [37,38] while few papers report on CSs in electrochemical devices. [39][40][41][42][43][44][45] In addition, none of these papers investigated the CSs electrochemical behavior in terms of magnetic and nonmagnetic properties. For this reason, we directly evaluated the electrochemical performance of the CSs by drop casting a dispersion of CSs on electrochemical chips (E-chips) and analyzing the response toward several clinically relevant analytes.…”

Section: Electrochemical Sensorsmentioning

confidence: 99%

Influence of Iron Catalyst in the Carbon Spheres Synthesis for Energy and Electrochemical Applications

Scarselli

Limosani

Passacantando

et al. 2018

Adv Materials Inter

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Carbon spheres of nanometric dimension are known since the first studies on the synthesis of fullerenes. Their shape originates from the curvature of a carbon sheet similar to fullerenes, but with numerous graphitic rings that regulate the inside structure and the formation of open edges at the surface. This paper focuses on the structural and electronic characterization of carbon spheres obtained from a chemical vapor deposition synthesis process. Two different sets of samples are analyzed in detail, in particular, electron microscopies and Raman spectroscopy help understanding the morphology and the graphitic‐sp2 arrangement of the carbon atoms in the architectures. In addition, the iron catalyst used during the reaction process confers the carbon spheres a ferromagnetic response at room temperature. Therefore, both the structural properties of the samples and the active contribution of iron mark the difference in the measured photoresponse as well as in the electrochemical behavior. The X‐ray photoelectron spectroscopy study addresses these points by giving information on the composition and the iron chemical state in the assembly. The collected results underline the advantages offered by this nanomaterial for sustainable applications.

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“…Second, there is electron transfer from the polymer matrix to CNTs as revealed by the band alignment between CNT and PS‐ b ‐P4VP (for more details, see the Supporting Information, Figure S11). Furthermore, the lone pair of electrons from the exposed vapors interacts with the CNT surface and transfers electrons to CNT, further enhancing the conductivity of the sensor implying that protonic coupled with electronic conduction is the dominant mechanism in case of CNT‐PS‐ b ‐P4VP sensors. This is consistent with our observations that pristine PS‐ b ‐P4VP sensors have lower sensitivity and are significantly slower compared to CNT‐PS‐ b ‐P4VP.…”

Section: Figurementioning

confidence: 99%

Embedding 1D Conducting Channels into 3D Isoporous Polymer Films for High‐Performance Humidity Sensing

et al. 2018

View full text Add to dashboard Cite

Isoporous block copolymer (BCP) films have received exponential interest as highly selective membranes, stemming from their unique morphological features, but their applications in functional devices remain to be realized. Now single‐walled carbon nanotubes (CNTs) were efficiently incorporated into isoporous block copolymer films for chemiresistive sensing at room temperature. Leveraging the efficient charge extraction ability of CNTs together with nanochannel arrays aligned perpendicular to the surface of the films, an ultrafast response time of 0.3 s was achieved for humidity detection with a sensor response of about 800 on changing humidity from 10 % to 95 %. Furthermore, the sensor also responds to various organic vapors, underscoring its promising detection capability.

show abstract

Hollow carbon spheres and a hollow carbon sphere/polyvinylpyrrolidone composite as ammonia sensors

Abstract: Hollow carbon sphere sensors were used to determine NH3 in a humid environment using a tristimulus pattern recognition approach.

Cited by 42 publications

References 93 publications

Embedding 1D Conducting Channels into 3D Isoporous Polymer Films for High‐Performance Humidity Sensing

Embedding 1D Conducting Channels into 3D Isoporous Polymer Films for High‐Performance Humidity Sensing

Influence of Iron Catalyst in the Carbon Spheres Synthesis for Energy and Electrochemical Applications

Embedding 1D Conducting Channels into 3D Isoporous Polymer Films for High‐Performance Humidity Sensing

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