A highly sensitive ppb-level H₂S gas sensor based on fluorophenoxy-substituted phthalocyanine cobalt/rGO hybrids at room temperature

Abstract

Highly sensitive gas sensing materials are of great importance for environmental pollution monitoring.

Sensing performance of room temperature operated MEMS gas sensor for ppb level detection of hydrogen sulfide: a review

“…As a result, novel nanostructures have been proposed as a viable method for lowering the adsorption and desorption energy of gas molecules and increasing electron transfer efficiency in order to achieve the promised room-temperature gas sensing properties [54]. Wang et al [55] successfully synthesized the cF 3 poPcCo/rGO composite for ppb level detection of H 2 S gas. Due to the peripheral substituent position of 4-cF3poPcCo and 4-trifluoromethylphenoxy group, the results show that the prepared sensor has improved gas sensing performance to H 2 S, including improved response (46.58%) and selectivity, and reduced recovery time (50 s) for 1 ppm concentration of H 2 S. The porous and loose structure allows gas molecules to be quickly absorbed and transferred to the cF 3 poPcCo/rGO layer, resulting in producing more active sites for the reaction between adsorbed oxygen O 2 − and H 2 S gas.…”

Azaporphyrins Embedded on Carbon-Based Nanomaterials for Potential Use in Electrochemical Sensing—A Review

“…This goal has been achieved. Wang et al adsorbed 4-trifluoromethylphenoxy substituted Co(II)Pc on reduced graphene oxide and estimated LOD of 11.6 ppb [70]. Better results (LOD = 5 ppb) were obtained when cobalt(II) phthalocyanine peripherally substituted by carboxyphenyloxy substituents was covalently attached to acidified MWCNTs with the use of hydroquinone, p-aminophenol, and p-phenylenediamine as linking molecules [71].…”

H2S Sensors: Synthesis, Optical Properties, and Selected Biomedical Applications under Visible and NIR Light

“…Hydrogen sulfide (H 2 S) is the third most important endogenous signal gas that cells use [ 1 , 2 ], after carbon monoxide and nitric oxide. It mediates multiple physiological and pathological processes [ 3 , 4 ].…”