Functionalized Multiwalled Carbon Nanotubes for Highly Stable Room Temperature and Humidity-Tolerant Triethylamine Sensing

ACS Sensors, Год журнала: 2023, Номер 8(12), С. 4664 - 4675

Опубликована: Дек. 8, 2023

Triethylamine (TEA) poses a significant threat to our health and is extremely difficult detect at the parts-per-billion (ppb) level room temperature. Carbon nanotubes (CNTs) are versatile materials used in chemiresistive vapor sensing. However, achieving high sensitivity selectivity with low detection limit remains challenge for pristine CNTs, hindering their widespread commercial application. To address these issues, we propose functionalized multiwalled CNTs (MWCNTs) carboxylic acid (COOH)-based sensing channels ultrasensitive TEA under ambient conditions. Advanced structural analyses confirmed necessary modification of MWCNTs after functionalization. The sensor exhibited excellent air, superior noise-free signal (10 ppb), an (LOD ≈ 0.8 repeatability, long-term stability Moreover, response values became more stable, demonstrating humidity resistance (40–80% RH). Notably, MWCNT improved recovery kinetics (200 400 s) 10 ppm compared (400 1300 s), coefficient gas was by approximately three times against various interferants, including ammonia, formaldehyde, nitrogen dioxide, carbon monoxide. remarkable improvements were mainly associated large specific surface area, abundant active sites, adsorbed oxygen, other defects. mechanism thoroughly explained using Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), chromatography–mass spectrometry (GC-MS). This study provides new platform CNT-based sensors selectivity, limits, enhanced precision universal potential applications food safety environmental monitoring.

Язык: Английский

---

Smart Driving Hardware Augmentation by Flexible Piezoresistive Sensor Matrices with Grafted‐on Anticreep Composites

Advanced Science, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 25, 2024

Abstract Signal drift and hysteresis of flexible piezoresistive sensors pose significant challenges against the widespread applications in emerging fields such as electronic skin, wearable equipment for metaverse human‐AI (artificial intelligence) interfaces. To address creep relaxation issues associated with pressure‐sensitive materials, a highly stable composite is proposed, using polyamide‐imide (PAI) fibers matrix situ grafted‐polymerized polyaniline (PANI) semi‐conducting layer. The PAI large rigid fluorenylidene groups exhibits high glass transition temperature 372 °C (PAI 5‐5), which results an extremely long time at room consequently offers outstanding anti‐creep/relaxation performances. enhancement PAI‐PANI interfacial bonding through grafting improves sensor reliably. presents linear sensitivity 35.3 kPa −1 over pressure range 0.2–20 kPa, repeatability, excellent dynamic stability only 3.8% signal deviation ≈10 000 cycles. Real‐time visualization distribution realized by matrices, demonstrate capability tactile gesture recognition on both flat curved surfaces. sitting postures achieved two 12 × matrices facilitated machine learning, prompts potential augmentation smart driving.

Язык: Английский

---

Flexible piezo-resistive strain sensors using all-polydimethylsiloxane based hybrid nanocomposites for wearable electronics

Physical Chemistry Chemical Physics, Год журнала: 2023, Номер 26(1), С. 95 - 104

Опубликована: Ноя. 22, 2023

We report flexible piezo-resistive strain sensors composed of silver nanoparticle (Ag NP), graphene nanoplatelet (GNP), and multi walled carbon nanotube (MWCNT)-based ternary conductive hybrid nanocomposites as an active sensing layer fabricated using a simple solution processing method on polydimethylsiloxane (PDMS) substrates. The electrical characteristics have been studied in PDMS-based devices having three different kinds structures, namely Ag NPs/MWCNT/PDMS, GNP/PDMS NPs/GNP/PDMS. microscopic analysis the is undertaken field emission scanning electron microscopy. diameter CNTs found to be range 20-40 nm, whereas length determined 100-800 nm. average GNPs are observed 30-50 nm 100-500 respectively. crystallite size nanoparticles NPs/MWCNT/PDMS NPs/GNP/PDMS-based 22.8 29.1 prepared sample NPs shows four distinct peaks X-ray diffraction pattern, which correspond (111), (200), (220), (311) face-centered cubic (FCC) crystalline planes. Raman spectroscopy study fundamental physical properties chemical nanocomposites. exhibit superior performance terms sensitivity, response recovery time during breathing/unbreathing analysis. large surface area promotes uniform distribution fill into porous GNP surface, thereby facilitating high contact along with better transport NPs/GNP/PDMS nanocomposite-based sensors. gauge factor (GF), 221, 130 ms 119 ms, free from drawbacks binary where percolation threshold poor mechanical behaviour lead degradation device performance.

Язык: Английский

---

Status, Applications, and Challenges of Flexible Pressure Sensors Based on 2-D Materials: A Review

IEEE Sensors Journal, Год журнала: 2024, Номер 24(7), С. 9251 - 9277

Опубликована: Фев. 2, 2024

The flexible pressure sensors enable their extensive utilization across a wide range of domains, encompassing wearable electronic devices, human–machine interfaces, skin, and intelligent medical treatment. In recent years, the rapid advancements in technologies such as Internet Things artificial intelligence, coupled with growing functional requirements, have given rise to flourishing research domain focused on high-performance sensors. Theoretical models, structural design, process preparation continuously advanced based traditional materials. However, these still fall short meeting demand for high quality, sensitivity, measurement capabilities. Meanwhile, excellent mechanical electrical properties 2-D materials make them best candidate material next generation advancement is currently constrained by factors challenge posed crosstalk arrays, impact environmental variables achieving optimal performance, intricate task decoupling multiple signals. This article reviews current status applications years puts forward some challenges, which provides valuable guide future developments this field. review sheds light

Язык: Английский

---

Flexible and Washable MXene@PEDOT:PSS@CS@PU Pressure Sensors

Sensors and Actuators A Physical, Год журнала: 2024, Номер 378, С. 115810 - 115810

Опубликована: Авг. 13, 2024

Язык: Английский

---