Ultrasensitive Detection of Formaldehyde in Gas and Solutions by a Catalyst Preplaced Sensor Based on a Pillar[5]arene Derivative

Abstract

Abnormal formaldehyde (FA) is known to induce a variety of diseases. Herein, we report a novel and efficient method for ultrasensitive detection of formaldehyde in gas and solutions by a catalyst preplaced sensor based on the pillar[5]­arene derivative (DP5J). By the catalyzation of (CF3SO3)2Bi, DP5J could selectively and sensitively sense formaldehyde through an aggregation-induced emission (AIE) “turn-on” response within 7.5 s, and the detection limits for formaldehyde is 3.27 × 10–9 M. Moreover, a FA test kit was prepared by loading the catalyst (CF3SO3)2Bi preplaced DP5J sensor (DP5J-Bi) on a silica gel plate. The test kit could conveniently and efficiently detect formaldehyde in gas or solution with ultrasensitivity. The catalysts preplaced method and FA reaction-induced AIE fluorescence “turn-on” mechanism is a novel approach to achieve ultrasensitive detection of FA. Importantly, it is also a novel approach for the efficient detection of other volatile organic compounds.

An Olefin‐based, Fluorescent Covalent Organic Framework for Selective Sensing of Aromatic Amines

“…The intensity of the fluorescence centered at 464 nm decreases when increasing concentration of aniline, the calibration curve of COFÀ PyÀ AN for aniline showed the better linearity between 0.04 to 0.34 mM (Figure 3a, Figure S11). The limit of detection [48] of COFÀ PyÀ AN toward aniline was 1.29 μM. Compared with other similar methods (Table S2), the COF material has a relatively low detection limit, indicating that COFÀ PyÀ AN has good sensitivity.…”

Optical chemosensors for the gas phase detection of aldehydes: mechanism, material design, and application

“…Compared to naked-eye-visual colorimetric methods, fluorometric chemosensors exhibit relatively rapid response and high sensitivity for detection of trace gaseous analytes under UV light irradiation. 34,60,96,97 According to fluorometric chemosensors for detecting aldehydes, this paper divided the reaction mechanism into four categories, including aldimine condensation, [98][99][100][101][102][103][104][105] Aza-Cope rearrangement, [106][107][108][109] QDs adjustment, 110,111 and functional MOFs interaction. 112,113 Most of these reactive fluorescent probes have been applied to detect aldehydes through the chemical reaction between -CHO group and the amine group on the probe.…”

“…In addition, the unique molecular structure of pillar[n]arenes leads to various supramolecular assembly driving forces, including C-H-π, π-π, cation-π, hydrophobic/hydrophilic, etc., which provides a novel platform for the construction of various interesting supramolecular systems, as well as AIE-based chemosensors. [118][119][120][121] An AIE-based sensor 105 with LDL of 0.1 ppb towards FA in 7.5 s was developed by introducing the hydrazide groups into pillar [5]arene (DP5J) (Fig. 19a).…”

“…(a) Proposed recognition mechanism of DP5J for monitoring FA, and (b) fluorescence color changes of silica gel plates and SEM of DP5J (amorphous powder)and DP5J+HCHO (cross-linked network structure). (Reproduced with permission 105.…”

A New Environmentally-Friendly Colorimetric Probe for Formaldehyde Gas Detection under Real Conditions

“…This work was published in 2018, which indicates that the preparation of supported sensors for formaldehyde is a hot research area. Also in 2018, Wei et al reported a formaldehyde sensor based on the aggregation-induced emission (AIE) effect [ 34 ]. In this case, the probe contained a complex structure and needed bismuth salts to detect the analyte.…”