scholarly journals Colorimetric Visualization Using Polymeric Core–Shell Nanoparticles: Enhanced Sensitivity for Formaldehyde Gas Sensors

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 998 ◽  
Author(s):  
Jae Jung Park ◽  
Yongsoo Kim ◽  
Chanmin Lee ◽  
Jun-Won Kook ◽  
Donghyun Kim ◽  
...  

Although equipment-based gas sensor systems (e.g., high-performance liquid chromatography) have been widely applied for formaldehyde gas detection, pre-treatment and expensive instrumentation are required. To overcome these disadvantages, we developed a colorimetric sensor based on polymer-based core–shell nanoparticles (PCSNPs), which are inexpensive, stable, and exhibit enhanced selectivity. Spherical and uniform poly(styrene-co-maleic anhydride) (PSMA)/polyethyleneimine (PEI) core–shell nanoparticles were prepared and then impregnated with Methyl Red (MR), Bromocresol Purple (BCP), or 4-nitrophenol (4-NP) to construct colorimetric sensors for formaldehyde gas. The intrinsic properties of these dyes were maintained when introduced into the PCSNPs. In the presence of formaldehyde, the MR, BCP, and 4-NP colorimetric sensors changed to yellow, red, and gray, respectively. The colorimetric response was maximized at a PEI/PSMA ratio of four, likely owing to the high content of amine groups. Effective formaldehyde gas detection was achieved at a relative humidity of 30% using the MR colorimetric sensor, which exhibited a large color change (92%) in 1 min. Advantageously, this stable sensor allowed sensitive and rapid naked-eye detection of low formaldehyde concentrations (0.5 ppm). Hence, this approach is promising for real-time formaldehyde gas visualization and can also be adapted to other colorimetric gas sensor systems to improve sensitivity and simplicity.

2020 ◽  
Vol 8 (33) ◽  
pp. 17276-17276
Author(s):  
Hu-Jun Lee ◽  
Dung Van Dao ◽  
Yeon-Tae Yu

Correction for ‘Superfast and efficient hydrogen gas sensor using PdAualloy@ZnO core–shell nanoparticles’ by Hu-Jun Lee et al., J. Mater. Chem. A, 2020, 8, 12968–12974, DOI: 10.1039/D0TA03552A.


2020 ◽  
Vol 8 (26) ◽  
pp. 12968-12974 ◽  
Author(s):  
Hu-Jun Le ◽  
Dung Van Dao ◽  
Yeon-Tae Yu

PdAualloy@ZnO CSNPs are prepared and evaluated for hydrogen detection with superior behavior with respect to pure ZnO. Improvement is attributed to .synergistically catalytic effects between Pd, Au and ZnO in PdAualloy@ZnO core–shell sensory system


Polymer Korea ◽  
2020 ◽  
Vol 44 (5) ◽  
pp. 664-671
Author(s):  
Jae Jung Park ◽  
Yongsoo Kim ◽  
Chanmin Lee ◽  
Jun-Won Kook ◽  
Donghyun Kim ◽  
...  

Nanoscale ◽  
2014 ◽  
Vol 6 (1) ◽  
pp. 581-588 ◽  
Author(s):  
Prabhakar Rai ◽  
Rizwan Khan ◽  
Sudarsan Raj ◽  
Sanjit Manohar Majhi ◽  
Kyung-Kuen Park ◽  
...  

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