Nitrogen-doped hollow carbon spheres as chemical vapour sensors

Mutuma, Bridget K.; Garcia-Martinez, Clara I.; Dias, Rodrigo C.; Matsoso, Boitumelo J.; Coville, Neil J.; Hümmelgen, Ivo A.

doi:10.1039/c9nj00628a

Cited by 27 publications

(15 citation statements)

References 87 publications

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“…Therefore, not specifically NG but generally NGCMs exhibit outstanding performance, compared to the pristine corresponding materials, in various technological applications. For instance, as chemical vapor sensors, [15] and photocatalysts for water remediation [16] . Chemical functionalization of NGCMs with surfactants can further improve their applicable performance as it enhances the dispersion state of their composing structural segments which increases the material surface area, [17] and meanwhile tailors their surfaces to be hydrophilic or hydrophobic as a good fit for specific application [18] .…”

Section: Introductionmentioning

confidence: 99%

Glucose‐Derived N‐Doped Graphitic Carbon: Facile One‐Pot Graphitic Structure‐Controlled Chemical Synthesis with Comprehensive Insight into the Controlling Mechanisms

et al. 2020

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Modification of graphitic structure chemistry and physics affords the N‐doped graphitic carbonaceous materials (NGCMs) superior and novel functional properties, which is essential for substantial development of applications based on such materials. The present research provides novel simple structure‐controlled chemical synthesis of NGCM. NGCM is grown from cyclic polymerization of glucose molecules upon hydrothermal treatment, employing Cetyltrimethylammonium bromide (CTAB) and ammonia as structure‐directing agents. Hydrothermal temperature and CTAB dose were manipulated and the produced graphitic structure has been explored in terms of oxidation state, N‐doping, surface functionalization with CTAB and morphology. NGC derivatives of various structural features are obtained. Products range from oxidized graphitic carbon of mixed micro‐sized sphere/sheet morphology to highly‐reduced graphene‐like nanosheets; the C/O atomic ratio increases from 8.2‐12.4 and sheet thickness downs from 30 μm‐ ∼1 nm. Also, N‐doping configurations and graphitic surface functionalization by CTAB are greatly influenced. CTAB plays the key role in setting the graphitic structure characteristics. Additionally, ammonia has a modest effect. Understanding of the controlling mechanisms is focused. The effective and ease control of graphitic structure via this facile, economic and ecofriendly synthesis approach, can benefit the design of NGCM with tuned functional properties for specific applications in technological industries.

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Section: Introductionmentioning

confidence: 99%

Glucose‐Derived N‐Doped Graphitic Carbon: Facile One‐Pot Graphitic Structure‐Controlled Chemical Synthesis with Comprehensive Insight into the Controlling Mechanisms

et al. 2020

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“…4a, the peaks located at 284.8 eV, 285.9 eV and 288.4 eV in the deconvolution of C 1s spectrum corresponds to the C-C/C]C, C-N and O-C]O, respectively. 35,36 For N 1s, the original high-resolution XPS spectrum was deconvoluted into three peaks, assigned to pyridinic N (398.8 eV, N connected to two sp 2 hybridized C atoms), pyrrolic N (400.0 eV, N of a ve-membered heterocyclic ring bonded with two C atoms), and graphitic N (401.2 eV, N bonded with three sp 2 hybridized C atoms), as shown in Fig. 4b.…”

Section: Resultsmentioning

confidence: 99%

Natural iron embedded hierarchically porous carbon with thin–thickness and high-efficiency microwave absorption properties

Zhang

Zhao

et al. 2020

RSC Adv.

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“…It has been shown that the change in the resistance of the sensor is caused by the bonding of molecules of ammonia to pyridine-like sites. Other types of nitrogen-doped carbon nanomaterials, e.g., N-doped carbon spheres [ 129 ], activated carbon [ 130 ], SWCNTs [ 131 ], and graphene [ 132 ], have also shown their efficiency in the detection of ammonia. However, there are some differences in the effect of doping on the response.…”

Section: Gas Sensors Based On Carbon Nanotubesmentioning

confidence: 99%

Recent Advances in Ammonia Gas Sensors Based on Carbon Nanomaterials

et al. 2021

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This review paper is devoted to an extended analysis of ammonia gas sensors based on carbon nanomaterials. It provides a detailed comparison of various types of active materials used for the detection of ammonia, e.g., carbon nanotubes, carbon nanofibers, graphene, graphene oxide, and related materials. Different parameters that can affect the performance of chemiresistive gas sensors are discussed. The paper also gives a comparison of the sensing characteristics (response, response time, recovery time, operating temperature) of gas sensors based on carbon nanomaterials. The results of our tests on ammonia gas sensors using various techniques are analyzed. The problems related to the recovery of sensors using various approaches are also considered. Finally, the impact of relative humidity on the sensing behavior of carbon nanomaterials of various different natures was estimated.

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Nitrogen-doped hollow carbon spheres as chemical vapour sensors

Abstract: The sensitivities of N-HCSs and annealed HCSs towards various analytes revealing a decrease in water sensitivity of the N-HCSs.

Cited by 27 publications

References 87 publications

Glucose‐Derived N‐Doped Graphitic Carbon: Facile One‐Pot Graphitic Structure‐Controlled Chemical Synthesis with Comprehensive Insight into the Controlling Mechanisms

Glucose‐Derived N‐Doped Graphitic Carbon: Facile One‐Pot Graphitic Structure‐Controlled Chemical Synthesis with Comprehensive Insight into the Controlling Mechanisms

Natural iron embedded hierarchically porous carbon with thin–thickness and high-efficiency microwave absorption properties

Recent Advances in Ammonia Gas Sensors Based on Carbon Nanomaterials

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