Tailoring surface properties with O/N doping in CNT aerogel film to obtain sensitive and selective sensor for volatile organic compounds detection

Prakash, Jyoti; Rao, P. T.; Ghorui, S.; Bahadur, Jitendra; Jain, Vaibhav; Dasgupta, Kinshuk

doi:10.1016/j.snb.2022.131606

Cited by 20 publications

(6 citation statements)

References 35 publications

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“…The polymer swelling broke and loosened the conductive path of CNTs network, which resulted in an increase in electrical resistance [ 28 , 29 , 30 ], as shown in Figure 6 . In the case of N-DWCNTs, the greater sensing performance of N-DWCNTs to formaldehyde vapor is attributed to the presence of a nitrogen-site on the surface of DWCNTs, which increases the strong interaction between formaldehyde molecule and the nitrogen site [ 18 , 31 ]. Moreover, the electrical resistance of N-DWCNTs is unable to recover to its initial value under air exposure (as shown in Figure 4 d).…”

Section: Resultsmentioning

confidence: 99%

Highly Sensitive and Selective Formaldehyde Gas Sensors Based on Polyvinylpyrrolidone/Nitrogen-Doped Double-Walled Carbon Nanotubes

Chobsilp

Threrujirapapong

Yordsri

et al. 2022

Sensors

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A highly sensitive and selective formaldehyde sensor was successfully fabricated using hybrid materials of nitrogen-doped double-walled carbon nanotubes (N-DWCNTs) and polyvinylpyrrolidone (PVP). Double-walled carbon nanotubes (DWCNTs) and N-DWCNTs were produced by high-vacuum chemical vapor deposition using ethanol and benzylamine, respectively. Purified DWCNTs and N-DWCNTs were dropped separately onto the sensing substrate. PVP was then dropped onto pre-dropped DWCNT and N-DWCNTs (hereafter referred to as PVP/DWCNTs and PVP/N-DWCNTs, respectively). As-fabricated sensors were used to find 1,2-dichloroethane, dichloromethane, formaldehyde and toluene vapors in parts per million (ppm) at room temperature for detection measurement. The sensor response of N-DWCNTs, PVP/DWCNTs and PVP/N-DWCNTs sensors show a high response to formaldehyde but a low response to 1,2-dichloroethane, dichloromethane and toluene. Remarkably, PVP/N-DWCNTs sensors respond sensitively and selectively towards formaldehyde vapor, which is 15 times higher than when using DWCNTs sensors. This improvement could be attributed to the synergistic effect of the polymer swelling and nitrogen-sites in the N-DWCNTs. The limit of detection (LOD) of PVP/N-DWCNTs was 15 ppm, which is 34-fold higher than when using DWCNTs with a LOD of 506 ppm. This study demonstrated the high sensitivity and selectivity for formaldehyde-sensing applications of high-performance PVP/N-DWCNTs hybrid materials.

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Section: Resultsmentioning

confidence: 99%

Highly Sensitive and Selective Formaldehyde Gas Sensors Based on Polyvinylpyrrolidone/Nitrogen-Doped Double-Walled Carbon Nanotubes

Chobsilp

Threrujirapapong

Yordsri

et al. 2022

Sensors

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“…The synthesis of the CNT aerogel was conducted using an in-house developed horizontal tube resistance furnace. Detailed information on the optimization of synthesis parameters has been previously reported by us [21,25]. In summary, a dense and uniform CNT aerogel lm was synthesized by passing a solution of thiophene and ferrocene in ethyl alcohol (C:Fe:S = 30:3:0.4 wt% ratio) through a pre-heater (150°C) using a carrier gas mixture of argon and hydrogen (1:1).…”

Section: Preparation Of the Cnt Aerogel Lm And Transfer Process On Se...mentioning

confidence: 99%

CNT Aerogel film based Novel Approach for Development of Ultra-Sensitive electrochemical Sensor Platforms with glassy carbon, screen-printed, and interdigitated electrodes

Prakash

2024

Preprint

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In sensor applications, the introduction of CNTs onto sensing substrates currently entails intricate processes with concerns over stability. This study demonstrate the utilization of CNT aerogel electrode as an ultrasensitive platform. Further introducing a novel approach employing a cast and pull-back technique along with drop-casting for successful binder less deposition of CNTs onto sensing substrates, utilizing a CNT aerogel film to augment the sensitivity of conventional glassy carbon electrodes (GCEs), screen-printed electrodes (SPEs), and interdigitated electrodes (IDEs). Scanning electron microscopy validates the deposition of CNT forests on GCE, entangled CNT networks on SPE, and IDE. Comparative electrochemical analyses reveal superior performance of CNT-incorporated SPE and GCE sensors, with the CNT aerogel electrode standing out prominently. Notably, CNT-incorporated SPE and GCE sensors demonstrate a respective approximately 12- and 2-fold increase in electrochemical active surface area, whereas the CNT aerogel electrode displays remarkable ~ 40-fold enhancement. For IDE, a significant 1700-fold change in resistance of IDE-CNT in the presence of a redox solution surpasses the 200-fold change observed in bare IDE, underscoring a substantial sensitivity enhancement facilitated by CNT incorporation. The mechanical integrity of CNT aerogel electrode post-exposure to liquids and sonication attests to its robust nature. The preservation of the deposited CNT forest on the SPE and GCE sensor platforms after multiple measurements further underscores its stability. This study positions the CNT aerogel electrode as a resilient and highly sensitive platform, particularly well-suited for the transfer of CNT networks onto diverse sensing substrates, thereby showcasing its potential to advance biomedical sensor technology.

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“…In this regard, herein we report a ready‐to‐use gold (Au) nanoparticles coated carbon nanotube (Au‐CNT) aerogel for glucose sensing. The CNT aerogel is an emerging material having high electrical conductivity, and high surface area and most importantly it is a free‐standing, flexible film made of a tiny network of CNT [30] . The CNT aerogel film was synthesized using a simple floating catalyst chemical vapor deposition method [31] .…”

Section: Introductionmentioning

confidence: 99%

“…The CNT aerogel is an emerging material having high electrical conductivity, and high surface area and most importantly it is a free-standing, flexible film made of a tiny network of CNT. [30] The CNT aerogel film was synthesized using a simple floating catalyst chemical vapor deposition method. [31] Further, CNT aerogel is uniformly coated with Au nanoparticles, since Au nanoparticles have high biocompatibility and excellent electrochemical activity towards glucose.…”

Section: Introductionmentioning

confidence: 99%

A Highly Porous and Flexible Carbon Nanotube Array Coated with Gold Nanoparticles: Application in Non‐Enzymatic Ultrasensitive Detection and Monitoring of Blood/Saliva Glucose

et al. 2023

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Flexible, reusable, and ultrasensitive glucose sensors are the need of the hour for advanced health monitoring, specifically for economical diabetes management in low-income countries.Here, we demonstrate an ultra-sensitive, and extremely lightweight non-enzymatic glucose sensor based on gold nanoparticles sputtered carbon nanotube aerogel film (Au-CNT), which is flexible, durable, reusable, and portable. The flexible Au-CNT aerogel non-enzymatic glucose sensor showed remarkable sensitivity of 779 μA mM À 1 cm À 2 , a wide linear range of 0.1 mM to 6 mM and a limit of detection (LoD) of 1.47 μM. The sensitivity of our sensor is highest among literature-reported carbon nanomaterials-based flexible glucose sensors for selective detection of glucose in blood serum/saliva samples. The Au-CNT aerogel shows the potential application as practical non-invasive and invasive self-monitoring glucose sensor. Therefore, highly sensitive and paper-thin Au-CNT electrode is a promising candidate for future commercial robust flexible and wearable biosensor applications.

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Tailoring surface properties with O/N doping in CNT aerogel film to obtain sensitive and selective sensor for volatile organic compounds detection

Cited by 20 publications

References 35 publications

Highly Sensitive and Selective Formaldehyde Gas Sensors Based on Polyvinylpyrrolidone/Nitrogen-Doped Double-Walled Carbon Nanotubes

Highly Sensitive and Selective Formaldehyde Gas Sensors Based on Polyvinylpyrrolidone/Nitrogen-Doped Double-Walled Carbon Nanotubes

CNT Aerogel film based Novel Approach for Development of Ultra-Sensitive electrochemical Sensor Platforms with glassy carbon, screen-printed, and interdigitated electrodes

A Highly Porous and Flexible Carbon Nanotube Array Coated with Gold Nanoparticles: Application in Non‐Enzymatic Ultrasensitive Detection and Monitoring of Blood/Saliva Glucose

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