Sensitive and fast optical HCl gas sensor using a nanoporous fiber membrane consisting of poly(lactic acid) doped with tetraphenylporphyrin

Hu, Min; Kang, Weimin; Cheng, Bowen; Li, Zongjie; Zhao, Yue; Li, Lei

doi:10.1007/s00604-016-1801-z

Cited by 35 publications

(20 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In addition, these color changes were clearly evident to the naked eye and occurred with response times of less than 1 s-significantly faster than those of previously reported HCl sensors. [54][55][56] The red color of the PyTA-BC COF and the brown color of the PyTA-BC-Ph COF reverted back to their original yellow colors following exposure to NH 3 vapor (Figure 4a,b). We observed no degradation in the color changes after 15 cycles of alternating exposure to HCl and NH 3 , confirming the excellent reversibility and structural rigidity of the PyTA-BC and PyTA-BC-Ph COFs when used as HCl sensors.…”

Section: Resultsmentioning

confidence: 99%

Dual‐Function Fluorescent Covalent Organic Frameworks: HCl Sensing and Photocatalytic H₂ Evolution from Water

EL‐Mahdy

Elewa

Huang

et al. 2020

Advanced Optical Materials

112

View full text Add to dashboard Cite

Two ultrastable luminescent covalent organic frameworks (COFs), PyTA‐BC and PyTA‐BC‐Ph, are synthesized through polycondensations of 4,4′,4″,4′″‐pyrene‐1,3,6,8‐tetrayl)tetraaniline (PyTA‐4NH2) with two carbazole‐based derivatives having different degrees of conjugation. The PyTA‐BC and PyTA‐BC‐Ph COFs exhibit ultrahigh thermal stabilities (up to 421 °C), excellent crystallinity, and high Brunauer–Emmett–Teller surface areas (up to 1445 m2 g−1). These COFs display strong fluorescence emissions in various solvents, with their emission maxima gradually red‐shifting upon increasing the polarity of the solvent (solvatochromism). Upon exposure to HCl, they respond very rapidly and sensitively in terms of changing their colors and fluorescence emission maxima. In the presence of a sacrificial electron donor, these COFs mediate the highly efficient photocatalytic evolution of H2 from water. In the absence of a noble metal cocatalyst, the COFs and ascorbic acid provide a photocatalytic H2 production of up to 1183 µmol g−1 h−1 (λ ≥ 420 nm); this value is the highest reported to date for a COF. Such COFs appear to be potentially useful as chemosensors for the naked‐eye and sensitive spectroscopic detection of HCl and as cocatalysts for the sustainable photocatalytic production of H2 from water.

show abstract

Section: Resultsmentioning

confidence: 99%

Dual‐Function Fluorescent Covalent Organic Frameworks: HCl Sensing and Photocatalytic H₂ Evolution from Water

EL‐Mahdy

Elewa

Huang

et al. 2020

Advanced Optical Materials

112

View full text Add to dashboard Cite

show abstract

“…Within only 5 seconds the nanofibrous membrane had changed its color from pink to green upon exposure to HCl. Compared to recently reported film‐based methods for HCl detection, e.g., porphyrinated polyimide honeycomb film or TMPyP/TiO 2 composite thin film, the detection limit is decreased from around 100 ppb to 34 ppb and the response times are two to four times faster, clearly indicating the advantage of using nanofibers over thin films . In such applications where detection of strong acids and/or bases is important, the sensors should often be able to withstand harsh chemical conditions, for example in industrial plants.…”

Section: Colorimetric Sensors Based On Doped Nanofibersmentioning

confidence: 96%

“…Also in this case, colorimetric sensors acting as instant warning signals upon leakages or exposure are of crucial importance in protective clothing or safety equipment. Kang et al used poly(lactic acid) nanofibers doped with tetraphenylporphyrin for the design of HCl gas sensors showing a detection limit of 34 ppb . Within only 5 seconds the nanofibrous membrane had changed its color from pink to green upon exposure to HCl.…”

Section: Colorimetric Sensors Based On Doped Nanofibersmentioning

confidence: 99%

Colorimetric Nanofibers as Optical Sensors

Schoolaert

Hoogenboom

Clerck

2017

Adv Funct Materials

110

View full text Add to dashboard Cite

Sensors play a major role in many applications today, ranging from biomedicine to safety equipment, where they detect and warn us about changes in the environment. Nanofibers, characterized by high porosity, flexibility, and a large specific surface area, are the ideal material for ultrasensitive, fastresponding, and user-friendly sensor design. Indeed, a large specific surface area increases the sensitivity and response time of the sensor as the contact area with the analyte is enlarged. Thanks to the flexibility of membranes, nanofibrous sensors cannot only be applied in high-end analyte detection, but also in personal, daily use. Many different nanofibrous sensors have already been designed; albeit, the most straightforward and easiest-to-interpret sensor response is a visual change in color, which is of particular interest in the case of warning signals. Recently, many researchers have focused on the design of so-called colorimetric nanofibers, which typically involve the incorporation of a colorimetric functionality into the nanofibrous matrix. Many different strategies have been used and explored for colorimetric nanofibrous sensor design, which are outlined in this feature article. The many examples and applications demonstrate the value of colorimetric nanofibers for advanced optical sensor design, and could provide directions for future research in this area.

show abstract

“…In the past decades, electrochemical, gas chromatographic, opto-chemical and optical HCl gas sensors have been developed [16][17][18][19][20][21]. However, these sensors are generally time consuming, or their sensitivities are not good, or expensive instrumentation [20].…”

Section: Introductionmentioning

confidence: 99%

Cellulose nano-crystals as a sensitive and selective layer for high performance surface acoustic wave HCl gas sensors

Tang

et al. 2020

Sensors and Actuators A: Physical

View full text Add to dashboard Cite

We report that cellulose nano-crystals (CNCs) can be used as a sensitive and selective layer in surface acoustic wave (SAW) sensors for in-situ HCl gas detection. CNCs were prepared through directly hydrolysis of cotton fiber and were spin-coated on quartz SAW resonators to form the sensitive layer. The CNCs have been identified to have abundant hydroxyl groups on their surfaces, which can act as the perfect adsorption sites for H2O, which can further act as the active sites for HCl gas adsorption. The absorption of HCl on the CNCs layer, thus leads to an increase of its mass, causing negative responses of the SAW sensors. Ambient humidity and thickness of CNCs layer are found to have significant influences on the responses of the SAW sensor. With an 80-nm-thick CNCs layer, the sensor shows a response of -2 kHz to 1 ppm HCl at 25 °C and relative humidity of 50% with an excellent selectivity and recovery characteristics.

show abstract

Sensitive and fast optical HCl gas sensor using a nanoporous fiber membrane consisting of poly(lactic acid) doped with tetraphenylporphyrin

Cited by 35 publications

References 42 publications

Dual‐Function Fluorescent Covalent Organic Frameworks: HCl Sensing and Photocatalytic H₂ Evolution from Water

Dual‐Function Fluorescent Covalent Organic Frameworks: HCl Sensing and Photocatalytic H₂ Evolution from Water

Colorimetric Nanofibers as Optical Sensors

Cellulose nano-crystals as a sensitive and selective layer for high performance surface acoustic wave HCl gas sensors

Contact Info

Product

Resources

About

Sensitive and fast optical HCl gas sensor using a nanoporous fiber membrane consisting of poly(lactic acid) doped with tetraphenylporphyrin

Cited by 35 publications

References 42 publications

Dual‐Function Fluorescent Covalent Organic Frameworks: HCl Sensing and Photocatalytic H2 Evolution from Water

Dual‐Function Fluorescent Covalent Organic Frameworks: HCl Sensing and Photocatalytic H2 Evolution from Water

Colorimetric Nanofibers as Optical Sensors

Cellulose nano-crystals as a sensitive and selective layer for high performance surface acoustic wave HCl gas sensors

Contact Info

Product

Resources

About

Dual‐Function Fluorescent Covalent Organic Frameworks: HCl Sensing and Photocatalytic H₂ Evolution from Water

Dual‐Function Fluorescent Covalent Organic Frameworks: HCl Sensing and Photocatalytic H₂ Evolution from Water