Expanded graphite/NiAl layered double hydroxide nanowires for ultra-sensitive, ultra-low detection limits and selective NO<sub>x</sub> gas detection at room temperature

Zhang, Xueying; Ikram, Muhammad; Li, Zhi; Teng, Lirong; Xue, Jialing; Wang, Di; Li, Li; Shi, Keying

doi:10.1039/c9ra00526a

Cited by 23 publications

(14 citation statements)

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“…As it can be seen, the ratio between ID/IG for NiFe-LDH/CX is the highest one compared to the other two samples, indicating a more disordered structure due to the reduction of the sp 2 region size. In Raman spectra for the prepared LDHs/CX, Figure 4b, there are two strong peaks at about 1338 and 1595 cm −1 , which could be assigned to the D and G bands of carbon, respectively [56]. These data confirm the coexistence of LDHs and carbon xerogel in the composites.…”

Section: Physicochemical Propertiessupporting

confidence: 57%

“…The peak located at 1380 cm −1 is assigned to the stretching vibrations of N-O of NO 3 − groups, confirming the intercalation of NO 3 anions [53]. The peak at 1049 cm −1 corresponds to the stretching vibration of C-O [54] In Raman spectra for the prepared LDHs/CX, Figure 4b, there are two strong peaks at about 1338 and 1595 cm −1 , which could be assigned to the D and G bands of carbon, respectively [56]. These data confirm the coexistence of LDHs and carbon xerogel in the composites.…”

Section: Physicochemical Propertiesmentioning

confidence: 61%

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Design of Self-Supported Flexible Nanostars MFe-LDH@ Carbon Xerogel-Modified Electrode for Methanol Oxidation

et al. 2021

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Layered double hydroxides (LDHs) have emerged as promising electrodes materials for the methanol oxidation reaction. Here, we report on the preparation of different LDHs with the hydrothermal process. The effect of the divalent cation (i.e., Ni, Co, and Zn) on the electrochemical performance of methanol oxidation was investigated. Moreover, nanocomposites of LDHs and carbon xerogels (CX) supported on nickel foam (NF) substrate were prepared to investigate the role of carbon xerogel. The results show that NiFe-LDH/CX/NF is an efficient electrocatalyst for methanol oxidation with a current density that reaches 400 mA·m−2 compared to 250 and 90 mA·cm−2 for NiFe-LDH/NF and NF, respectively. In addition, all LDH/CX/NF nanocomposites show excellent stability for methanol oxidation. A clear relationship is observed between the electrodes crystallite size and their activity to methanol oxidation. The smaller the crystallite size, the higher the current density delivered. Additionally, the presence of carbon xerogel in the nanocomposites offer 3D interconnected micro/mesopores, which facilitate both mass and electron transport.

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Section: Physicochemical Propertiessupporting

confidence: 57%

Section: Physicochemical Propertiesmentioning

confidence: 61%

Design of Self-Supported Flexible Nanostars MFe-LDH@ Carbon Xerogel-Modified Electrode for Methanol Oxidation

et al. 2021

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“…Among all of the contaminants in air, volatile organic compounds (VOCs) such as acetone, ethanol, and ammonia vapors are the most common and hazardous. Even at very low concentrations these molecules not only pollute the environment, but also directly affect human health and climate change. ,, Commercial gas sensors are based on different transduction mechanisms and materials, which include polymers, − metal oxides, − or nanocomposites. ,,− The most common are the ones based on metal oxide semiconductors, which require high working temperatures to obtain good sensitivities, fast response, and selectivity. ,, Morandi et al fabricated a CH 4 sensor using Pt/Zn/Al-LDH operating at 450 °C . This entails an increase in power consumption and device complexities, and it is unfavorable for device stability and flammable or explosive environments.…”

Section: Introductionmentioning

confidence: 99%

Layered Double Hydroxide-Based Gas Sensors for VOC Detection at Room Temperature

et al. 2021

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Miniaturized low-cost sensors for volatile organic compounds (VOCs) have the potentiality to become a fundamental tool for indoor and outdoor air quality monitoring, to significantly improve everyday life. Layered double hydroxides (LDHs) belong to the class of anionic clays and are largely employed for NO x detection, while few results are reported on VOCs. In this work, a novel LDH coprecipitation method is proposed. For the first time, a study comparing four LDHs (ZnAl−Cl, ZnFe−Cl, ZnAl− NO 3 , and MgAl−NO 3 ) is carried out to investigate the sensing performances. As explored through several microscopy and spectroscopy analyses, LDHs show a morphology characterized by a large surface area and a three-dimensional hierarchical flowerlike architecture with micro-and nanopores that induce a fast diffusion and highly effective surface interaction of the target gases. The fabricated sensors, operating at room temperature, are able to reversibly and selectively detect acetone, ethanol, ammonia, and chlorine vapors, reaching significant sensing response values up to 6% at 21 °C. The results demonstrate that by changing the LDHs' composition, it is possible to modulate the sensitivity and selectivity of the sensor, helping the discrimination of different analytes, and the consequent integration on a sensor array paves the way for electronic nose development.

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“…In consideration of low current density and gradual change in current, in combination with the above analysis for the mechanism of analog resistive switching, as previously reported, formation and migration of oxygen vacancies in LDHs are energetically expedient [ 48 ]. In addition, low electron affinity of oxygen (compared to its first ionization energy) may be conducive to formation of O 2− ions.…”

Section: Resultsmentioning

confidence: 98%

Analog and Digital Bipolar Resistive Switching in Co–Al-Layered Double Hydroxide Memristor

Sun

Shi

2020

Nanomaterials

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We demonstrate a nonvolatile memristor based on Co–Al-layered double hydroxide (Co–Al LDH). We also introduce a memristor that has a hexazinone-adsorbing Co–Al LDH composite active layer. Memristor characteristics could be modulated by adsorbing hexazinone with Co–Al LDHs in the active layer. While different, Co–Al LDH-based memory devices show gradual current changes, and the memory device with small molecules of adsorbed hexazinone undergo abrupt changes. Both devices demonstrate programmable memory peculiarities. In particular, both memristors show rewritable resistive switching with electrical bistability (>105 s). This research manifests the promising potential of 2D nanocomposite materials for adsorbing electroactive small molecules and rectifying resistive switching properties for memristors, paving a way for design of promising 2D nanocomposite memristors for advanced device applications.

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Expanded graphite/NiAl layered double hydroxide nanowires for ultra-sensitive, ultra-low detection limits and selective NO_x gas detection at room temperature

Abstract: Expanded graphite/NiAl-LDH nanowires for ultra-sensitive, ultra-low detection limits and selective NOx gas detection at room temperature.

Cited by 23 publications

References 60 publications

Design of Self-Supported Flexible Nanostars MFe-LDH@ Carbon Xerogel-Modified Electrode for Methanol Oxidation

Design of Self-Supported Flexible Nanostars MFe-LDH@ Carbon Xerogel-Modified Electrode for Methanol Oxidation

Layered Double Hydroxide-Based Gas Sensors for VOC Detection at Room Temperature

Analog and Digital Bipolar Resistive Switching in Co–Al-Layered Double Hydroxide Memristor

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Expanded graphite/NiAl layered double hydroxide nanowires for ultra-sensitive, ultra-low detection limits and selective NOx gas detection at room temperature

Abstract: Expanded graphite/NiAl-LDH nanowires for ultra-sensitive, ultra-low detection limits and selective NOx gas detection at room temperature.

Cited by 23 publications

References 60 publications

Design of Self-Supported Flexible Nanostars MFe-LDH@ Carbon Xerogel-Modified Electrode for Methanol Oxidation

Design of Self-Supported Flexible Nanostars MFe-LDH@ Carbon Xerogel-Modified Electrode for Methanol Oxidation

Layered Double Hydroxide-Based Gas Sensors for VOC Detection at Room Temperature

Analog and Digital Bipolar Resistive Switching in Co–Al-Layered Double Hydroxide Memristor

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Expanded graphite/NiAl layered double hydroxide nanowires for ultra-sensitive, ultra-low detection limits and selective NO_x gas detection at room temperature