Multifurcation Assembly of Charged Aerosols and Its Application to 3D Structured Gas Sensors

Bae, Yongjun; Pikhitsa, Peter V.; Cho, Hyesung; Choi, Mansoo

doi:10.1002/adma.201604159

Cited by 26 publications

(34 citation statements)

References 41 publications

(49 reference statements)

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“…[164][165][166] It is therefore essential to monitor these polluting substances effectively and accurately. The sensing behavior of chemical sensors generally is based on the interactions between target substances and sensors, including charge transfer, [167][168][169] hydrophobic/hydrophilic interactions, [170,171] dipoledipole interactions, [167,172] capacity variation, [173] and hydrogen bonding. [174][175][176][177] In the FET chemical sensors, using semiconductor materials with small molecular weights, the analyte molecules penetrate into the semiconductor layers through the grain boundary, rather than through the cluster due to the dense molecular packing.…”

Section: F-fet Sensors For Detecting Environment Conditionsmentioning

confidence: 99%

Recent Advances in Flexible Field‐Effect Transistors toward Wearable Sensors

Han

Zhou

2020

Advanced Intelligent Systems

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The introduction of the "Internet of Things" (IoTs) concept has spawned a series of research and development of wearable sensors. Flexible field-effect transistors (FETs) are considered to be potential sensing devices due to the variety of material utilization and the self-amplifying function on electrical signals. FETs have demonstrated the ability of detecting different kinds of external stimuli and continuous monitoring functionalities. Herein, the recent progress achieved by the academia in wearable sensors based on flexible FETs, including pressure, temperature, chemical, and biological analytes, which are vital for the manufacturing of smart wearable devices, is summarized. The sensing mechanism for different sensors is introduced and an in-depth discussion is presented, including material engineering, problems at the current stage, and future challenges.

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Section: F-fet Sensors For Detecting Environment Conditionsmentioning

confidence: 99%

Recent Advances in Flexible Field‐Effect Transistors toward Wearable Sensors

Han

Zhou

2020

Advanced Intelligent Systems

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“…3D hierarchical‐structured metal oxides have drawn wide attention in gas‐sensing technology research in recent years due to their high surface area and abundance of accessible active sites, which can not only efficiently enhance molecular gas diffusion but also provide a number of active sites for enhancing the selectivity and catalytic activity . To date, various 3D hierarchical‐structured metal oxides with desirable morphologies and structures have been designed and synthesized to improve the performance of gas sensors, such as ZnO, Co 3 O 4 , SnO 2 , WO 3 , and In 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

“…Hence, it is essential to detect methanol with high sensitivity and selectivity for environmental monitoring and healthcare purposes.3D hierarchical-structured metal oxides have drawn wide attention in gas-sensing technology research in recent years due to their high surface area and abundance of accessible active sites, which can not only efficiently enhance molecular gas diffusion but also provide a number of active sites for enhancing the selectivity and catalytic activity. [17][18][19][20][21][22][23][24][25] To date, various 3D hierarchical-structured metal oxides with desirable morphologies and structures have been designed and synthesized to improve the performance of gas sensors, such as ZnO, [26][27][28] Co 3 O 4 , [29][30][31] SnO 2 , [32,33] WO 3 , [34][35][36] and In 2 O 3 . [37][38][39] Meanwhile, the exposed crystals of 3D hierarchical-structured metal oxides have also had a pivotal effect on the sensitivity and selectivity of gas sensors.…”

mentioning

confidence: 99%

Multishelled Hollow Structures of Yttrium Oxide for the Highly Selective and Ultrasensitive Detection of Methanol

Zheng

Zhang

Zeng

et al. 2019

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Methanol is extremely harmful to human health, since it is oxidized slowly and can accumulate in the human body. Therefore, it is essential to develop a methanol gas sensing technology with high sensitivity and selectivity for use in environmental monitoring and healthcare. In this work, a simple and low‐cost sensor based on a Y2O3 multishelled hollow structure (YMSH) to selectively detect methanol with an ultrasensitive limit of detection (71 ppb) is developed. The unique multishelled hollow structure with a large surface area and exposed {222} facets makes an important contribution to the ultrasensitive detection of methanol, which is further confirmed by subsequent theoretical simulations. Moreover, in situ Fourier transform infrared spectra verify that CO2 is the final product, which indicates a high catalytic activity of the YMSHs toward methanol oxidation. Interestingly, the sensor can also be applied to liquor samples that are mixtures of ethanol, methanol, and water, which provides a facile way to detect methanol in wines. This sensor represents a unique and highly sensitive means to detect methanol, which has great promise for potential application in environmental monitoring and food safety inspection.

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“…In the BUONAPART-E project, 21 partners from both industry and academia worked on this upscaling approach and realized a production rate of 100 kg day −1 (BUONAPART-E). Although the SDG has been around us since the invention of the gasoline engine, its first use as an intentional nanoparticle generator dates to 1988 (Schwyn et al 1988), which is now commercially available (Helsper et al 1993), and used by several groups (Messing et al 2010a, Messing et al 2010b, Kala et al 2016, Pfeiffer et al 2015, Bae et al 2017, Muntean et al 2016, Byeon et al 2009, the very fundamentals of the processes leading to particle formation is not yet fully understood. One reason for this knowledge gap lies in the difficulty of investigating the different stages of nanoparticle formation, especially the initial, early phase of the process.…”

Section: Introductionmentioning

confidence: 99%

From plasma to nanoparticles: optical and particle emission of a spark discharge generator

et al. 2017

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The increased demand for high purity nanoparticles (NPs) of defined geometry necessitates the continuous development of generation routes. One of the most promising physical techniques for producing metal, semiconductor or alloy NPs in the gas phase is spark discharge NP generation. The technique has a great potential for up-scaling without altering the particles. Despite the simplicity of the setup, the formation of NPs in a spark discharge takes place via complex multi-scale processes, which greatly hinders the investigation via conventional NP measurement techniques. In the present work, time-resolved optical emission spectroscopy (OES) was used to provide information on the species present in the spark from as early as approximately 100 ns after the initiation of the discharge. We demonstrate that operando emission spectroscopy can deliver valuable insights into NP formation. The emission spectra of the spark are used to identify, among others, the main stages of material erosion and to calculate the quenching rate of the generated metal vapour. We demonstrate that the alteration of key control parameters, that are typically used to optimize NP generation, clearly affect the emission spectra. We report for Cu and Au NPs that the intensity of spectral lines emitted by metal atoms levels off when spark energy is increased above an energy threshold, suggesting that the maximum concentration of metal vapour produced in the generator is limited. This explains the size variation of the generated NPs. We report a strong correlation between the optical and particle emission of the spark discharge generator, which demonstrate the suitability of OES as a valuable characterization tool that will allow for the more deliberate optimization of spark-based NP generation.

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Multifurcation Assembly of Charged Aerosols and Its Application to 3D Structured Gas Sensors

Cited by 26 publications

References 41 publications

Recent Advances in Flexible Field‐Effect Transistors toward Wearable Sensors

Recent Advances in Flexible Field‐Effect Transistors toward Wearable Sensors

Multishelled Hollow Structures of Yttrium Oxide for the Highly Selective and Ultrasensitive Detection of Methanol

From plasma to nanoparticles: optical and particle emission of a spark discharge generator

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