Enhanced performance of core-shell structured polyaniline at helical carbon nanotube hybrids for ammonia gas sensor

Tian, Xin; Wang, Qiang; Chen, Xiangnan; Yang, Weiqing; Wu, Zuquan; Xu, Xiaoling; Jiang, Man; Zhou, Zuowan

doi:10.1063/1.4902242

Cited by 19 publications

(10 citation statements)

References 30 publications

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“…Fluorescence with no significant loss in intensity during cyclical switching (on and off) of NH 3 gas indicated the stability and fast responsive behavior of (OA) 2 PbI 4 . Formation of volatile methylamine makes conventional MAPbI 3 unstable to withstand continuous exposure cycles of NH 3 and changes its property irreversibly after the first pulse of NH 3 , whereas formation of low volatile OA in the presence of NH 3 and reconversion to octylammonium in the absence of NH 3 makes (OA) 2 PbI 4 an interesting room temperature sensory material for NH 3 (Figure B(i)). , Interestingly, (OA) 2 PbI 4 did not show response or changes in properties in the presence of water vapor, as established by fluorescence spectroscopy and optical microscopy (Figure A,B). The green fluorescence of the (OA) 2 PbI 4 film showed no changes during the exposure or removal of water vapor (Figure B), which proved the sensitivity of (OA) 2 PbI 4 specifically toward NH 3 and not toward atmospheric moisture.…”

Section: Results and Discussionmentioning

confidence: 93%

Volatility and Chain Length Interplay of Primary Amines: Mechanistic Investigation on the Stability and Reversibility of Ammonia-Responsive Hybrid Perovskites

Sasmal

Sinha

Donnadieu

et al. 2018

ACS Appl. Mater. Interfaces

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Hybrid organic-inorganic perovskites possess promising signal transduction properties, which can be exploited in a variety of sensing applications. Interestingly, the highly polar nature of these materials, while being a bane in terms of stability, can be a boon for sensitivity when they are exposed to polar gases in a controlled atmosphere. However, signal transduction during sensing induces irreversible changes in the chemical and physical structure, which is one of the major lacuna preventing its utility in commercial applications. In the context of developing alkylammonium lead(II) iodide perovskite materials for sensing, here we address major issues such as reversibility of structure and properties, correlation between instability and properties of alkylamines, and relation between packing of alkyl chains inside the crystal lattice and the response time toward NH gas. The current investigation highlights that the vapor pressure of alkylamine formed in the presence of NH determines the reversibility and stability of the original perovskite lattice. In addition, close packing of alkyl chains inside the perovskite crystal lattice reduces the response toward NH gas. The mechanistic study addresses three important factors such as quick response, reversibility, and stability of perovskite materials in the presence of NH gas, which could lead to the design of stable and sensitive two-dimensional hybrid perovskite materials for developing sensors.

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Section: Results and Discussionmentioning

confidence: 93%

Volatility and Chain Length Interplay of Primary Amines: Mechanistic Investigation on the Stability and Reversibility of Ammonia-Responsive Hybrid Perovskites

Sasmal

Sinha

Donnadieu

et al. 2018

ACS Appl. Mater. Interfaces

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“…339 The sensitivity of this system of SWCNT-PABS can achieve a NH 3 LOD of 100 ppb (20 ppb for NO 2 ) by adjusting the initial resistance of the sensor. 141 In addition, composites of poly(aniline) (PANI) and CNTs, prepared by electropolymerization on SWCNT electrodes 340 or by in situ polymerization of aniline in SWCNT suspension, 341,342 showed low limits of detection to NH 3 (50 ppb Zhang et al 340 ) and fast recovery times. Interestingly, Li et al reported that poly(methyl methacrylate) (PMMA) when combined with MWCNTs produced n-type gas sensing characteristics with a decrease in resistivity when exposed to NH 3 .…”

Section: Cnt-based Sensors For Environmental Monitoringmentioning

confidence: 99%

Carbon Nanotube Chemical Sensors

et al. 2018

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Carbon nanotubes (CNTs) promise to advance a number of real-world technologies. Of these applications, they are particularly attractive for uses in chemical sensors for environmental and health monitoring. However, chemical sensors based on CNTs are often lacking in selectivity, and the elucidation of their sensing mechanisms remains challenging. This review is a comprehensive description of the parameters that give rise to the sensing capabilities of CNT-based sensors and the application of CNT-based devices in chemical sensing. This review begins with the discussion of the sensing mechanisms in CNT-based devices, the chemical methods of CNT functionalization, architectures of sensors, performance parameters, and theoretical models used to describe CNT sensors. It then discusses the expansive applications of CNT-based sensors to multiple areas including environmental monitoring, food and agriculture applications, biological sensors, and national security. The discussion of each analyte focuses on the strategies used to impart selectivity and the molecular interactions between the selector and the analyte. Finally, the review concludes with a brief outlook over future developments in the field of chemical sensors and their prospects for commercialization.

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“…However, they still have limitations, such as a low selectivity and long response and recovery times compared to metal oxide- or CP-based sensors [ 25 , 26 , 27 , 28 ]. Regarding these issues, there have been some results improved by surface treatments [ 16 , 29 , 30 ], functionalization [ 19 , 31 , 32 , 33 ], the use of core-shell structures [ 34 , 35 ], specially designed hetero-structures [ 36 , 37 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Negatively-Doped Single-Walled Carbon Nanotubes Decorated with Carbon Dots for Highly Selective NO2 Detection

2020

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In this study, we demonstrated a highly selective chemiresistive-type NO2 gas sensor using facilely prepared carbon dot (CD)-decorated single-walled carbon nanotubes (SWCNTs). The CD-decorated SWCNT suspension was characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), and UV-visible spectroscopy, and then spread onto an SiO2/Si substrate by a simple and cost-effective spray-printing method. Interestingly, the resistance of our sensor increased upon exposure to NO2 gas, which was contrary to findings previously reported for SWCNT-based NO2 gas sensors. This is because SWCNTs are strongly doped by the electron-rich CDs to change the polarity from p-type to n-type. In addition, the CDs to SWCNTs ratio in the active suspension was critical in determining the response values of gas sensors; here, the 2:1 device showed the highest value of 42.0% in a sensing test using 4.5 ppm NO2 gas. Furthermore, the sensor selectively responded to NO2 gas (response ~15%), and to other gases very faintly (NO, response ~1%) or not at all (CO, C6H6, and C7H8). We propose a reasonable mechanism of the CD-decorated SWCNT-based sensor for NO2 sensing, and expect that our results can be combined with those of other researches to improve various device performances, as well as for NO2 sensor applications.

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Enhanced performance of core-shell structured polyaniline at helical carbon nanotube hybrids for ammonia gas sensor

Cited by 19 publications

References 30 publications

Volatility and Chain Length Interplay of Primary Amines: Mechanistic Investigation on the Stability and Reversibility of Ammonia-Responsive Hybrid Perovskites

Volatility and Chain Length Interplay of Primary Amines: Mechanistic Investigation on the Stability and Reversibility of Ammonia-Responsive Hybrid Perovskites

Carbon Nanotube Chemical Sensors

Negatively-Doped Single-Walled Carbon Nanotubes Decorated with Carbon Dots for Highly Selective NO2 Detection

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