《Ultrafast detection and discrimination of methanol gas using a polyindole-embedded substrate integrated waveguide microwave sensor》 was written by Kumar, Alok; Wang, Cong; Meng, Fan-Yi; Jiang, Cheng-Peng; Yan, Guo-Feng; Zhao, Meng; Jing, Chang-Qiang; Wang, Lei. COA of Formula: C8H7N And the article was included in ACS Sensors in 2020. The article conveys some information:
The fast and sensitive detection of methanol gas using cost-effective sensors in the industry is a significant issue to be addressed. Herein, a polyindole (PIn)-deposited substrate integrated waveguide (SIW) has been introduced to perform quant. and qual. methanol gas sensing with quick response and recovery time at room temperature First, PIn is synthesized and deposited in the microwell etched at the intensified elec. field region of the microwave-based cavity resonator, which gives a sensing response through variation of PIn’s high-frequency conductivity and dielec. property caused by the adsorption and desorption of methanol gas. Second, an enhanced filling factor and high Q factor have been attained using the proposed microwell etched SIW structure, which exhibits high sensitivity in terms of frequency shift (3.33 kHz/ppm), amplitude shift (0.005 dB/ppm), bandwidth broadening (3.66 kHz/ppm), and loaded Q factor (10.60 Q value/ppm). Third, the gas measurement results reveal excellent long-term stability with a relative standard deviation (RSD) of 0.02% for 7 days, excellent repeatability with an RSD of 0.004%, and desired response and recovery time of 95 and 120 s, resp. The results indicate that the proposed microwave sensor has great potential to achieve high sensitivity and fast response toward methanol gas mols. at room temperature In the experiment, the researchers used many compounds, for example, 1H-Indole(cas: 120-72-9COA of Formula: C8H7N)
1H-Indole(cas: 120-72-9) belongs to indole. Indole, also called Benzopyrrole, a heterocyclic organic compound occurring in some flower oils, such as jasmine and orange blossom, in coal tar, and in fecal matter. It is used in perfumery and in making tryptophan, an essential amino acid, and indoleacetic acid (heteroauxin), a hormone that promotes the development of roots in plant cuttings.COA of Formula: C8H7N
Referemce:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles