A High-Sensitivity Methane Sensor with Localized Surface Plasmon Resonance Behavior in an Improved Hexagonal Gold Nanoring Array

Liu, Hai; Chen, Cong; Zhang, Yanzeng; Bai, Bingbing; Tang, Shoufeng

doi:10.3390/s19214803

Cited by 24 publications

(10 citation statements)

References 26 publications

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“…Despite the difficulty of achieving CH 4 selectivity in MOS sensors, researchers have proposed some strategies, such as using noble metals (Pt, Pd, Au) as promoters. − Noble metals can enhance MOS sensing performance through their chemical sensitization (catalytic oxidation) to target gases and electronic sensitization (Fermi-level shifting) to MOS . Among various noble metals, Pd is the best MOS CH 4 sensing promoter owing to the superior activity of the PdOx/Pd redox pair on the cleavage of C-H bonds, which is the key step to CH 4 oxidation. − As a result of the activation of CH 4 , Pd can remarkably increase CH 4 response and therefore relatively increase CH 4 selectivity.…”

Section: Introductionmentioning

confidence: 99%

ZnO/Pd@ZIF-7-Based Gas Sensors for Selective Methane Sensing

Luo

Chen

Wang

et al. 2023

ACS Appl. Nano Mater.

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Selective methane detection is essential for process safety in industries such as coal mining, where CO, NH 3 , and NO 2 serve as interfering gases. A promising approach is to use metal oxide semiconductor (MOS)-based sensors, which are low-cost, highly sensitive, and easy to fabricate. However, the poor selectivity of MOS sensors due to nonselective surface reactions remains a significant challenge. In this study, we fabricated a ZnO/Pd@ZIF-7 core-shell structure−based gas sensor using a self-sacrificial method. The ZnO/Pd layer served as the sensitive layer to generate sensing signals, while the ZIF-7 shell acted as a filter. By manipulating gas diffusion, ZIF-7 significantly improved CH 4 sensing selectivity against CO, NH 3 , and NO 2 . For NO 2 , which strongly interacts with ZIF-7, the diffusion through ZIF-7 was significantly hindered, resulting in a decreased response across all temperature ranges (110−250 °C). For CH 4 , CO, and NH 3 , which weakly interact with ZIF-7, the influence of ZIF-7 depended on temperature, as competition occurred between surface reactions and diffusion through ZIF-7. At low temperatures, ZIF-7 enriched gases and promoted the response of the three gases. At elevated temperatures, ZIF-7 separated gases according to their molecular polarity, where the diffusion of polar CO and NH 3 was more hindered than nonpolar CH 4 . The excellent CH 4 selectivity against CO, NH 3 , and NO 2 was achieved at 210 °C, with fast response/recovery, good repeatability, and long-term stability. Our study not only provides a possible solution to enable sensing selectivity of MOS to CH 4 , but the insights into the effect of the ZIF-7 filter may also inspire the development of highly selective gas sensors.

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Section: Introductionmentioning

confidence: 99%

ZnO/Pd@ZIF-7-Based Gas Sensors for Selective Methane Sensing

Luo

Chen

Wang

et al. 2023

ACS Appl. Nano Mater.

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“…In addition, the highly localized and enhanced electromagnetic field of LSPR sensing caused by the metal nanoparticle arrays is perfectly suited to surface enhanced Raman scattering (SERS) analysis . Meanwhile, LSPR provides a simple method of excitement via a self-assembly molecular film on both the plane and curved surface, which contributes to a highly sensitive, real-time, and label-free detection. , Nowadays, the LSPR technique mainly applies in cancer detection, food safety, medical health applications, and other biochemical detections. , Although LSPR sensing technology is a powerful tool in the biochemistry field because of its attractive optical properties, it is still expected to display ultrasensitive and more stable performances.…”

Section: Introductionmentioning

confidence: 99%

Polyelectrolyte-Enhanced Localized Surface Plasmon Resonance Optical Fiber Sensors: Properties Interrogation and Bioapplication

Lin

Liang

et al. 2022

ACS Appl. Nano Mater.

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Localized surface plasmon resonance (LSPR) and lossy mode resonance (LMR) are excited simultaneously by the gold nanoparticle (AuNP) arrays and the top-coated polyelectrolyte layer on optical fibers. The well-dispersed and dense AuNP arrays ordered by the diblock copolymer-template have LSPR sensing characteristics, whereas the layer-by-layer coated polyelectrolyte film carries LMR-based sensitivity enhancement. Both the experimental and simulation results illustrated that the thickness of the polyelectrolyte layer is the key factor affecting the optical properties of the proposed polyelectrolyte-enhanced LSPR sensor, and the sensor with a thicker polyelectrolyte layer presents a higher refractive index (RI) sensitivity because the lossy mode of the polyelectrolyte layer enhances the plasmonic resonance of AuNP arrays. The optimal sensor, which self-assembles with 50 nm AuNPs and 20 PAH/PSS bilayers, shows higher sensitivity and stability, with an RI sensitivity of 1312 nm/RIU and a detection limit for human IgG of 32.1 μg/mL. In addition, we observed an abnormally enhanced peak with an invariable wavelength, which has great potential to eliminate interference as a self-reference signal.

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“…In particular, people are sensitive to toxic, flammable, explosive, and polluting gases present in homes, industrial sites, and the environment [1,2]. Methane is highly explosive and flammable, so developing a methane sensor with low cost, high sensitivity, good selectivity, and stable performance has become a hot spot [3][4][5][6]. In the study of CH 4 adsorption materials, it is usually microporous carbon [7], metal-organic Frameworks [8], layered InN [9], and Ni surface [10].…”

Section: Introductionmentioning

confidence: 99%

Study on the adsorption selection of CH$$_4$$ on CuO (110) versus (111) surfaces: a density functional theory study

Lin

Yao

et al. 2021

SN Appl. Sci.

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Finding the active sites of suitable metal oxides is a key prerequisite for detecting CH$$_4$$ 4 . The purpose of the paper is to investigate the adsorption of CH$$_4$$ 4 on intrinsic and oxygen-vacancies CuO (111) and (110) surfaces using density functional theory calculations. The results show that CH$$_4$$ 4 has a strong adsorption energy of −0.370 to 0.391 eV at all site on the CuO (110) surface. The adsorption capacity of CH$$_4$$ 4 on CuO (111) surface is weak, ranging from −0.156 to −0.325 eV. In the surface containing oxygen vacancies, the adsorption capacity of CuO surface to CH$$_4$$ 4 is significantly stronger than that of intrinsic CuO surface. The results indicate that CuO (110) has strong adsorption and charge transfer capacity for CH$$_4$$ 4 , which may provide experimental guidance.

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A High-Sensitivity Methane Sensor with Localized Surface Plasmon Resonance Behavior in an Improved Hexagonal Gold Nanoring Array

Cited by 24 publications

References 26 publications

ZnO/Pd@ZIF-7-Based Gas Sensors for Selective Methane Sensing

ZnO/Pd@ZIF-7-Based Gas Sensors for Selective Methane Sensing

Polyelectrolyte-Enhanced Localized Surface Plasmon Resonance Optical Fiber Sensors: Properties Interrogation and Bioapplication

Study on the adsorption selection of CH$$_4$$ on CuO (110) versus (111) surfaces: a density functional theory study

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