Detection of explosive vapors with a charge transfer molecule: self-assembly assisted morphology tuning and enhancement in sensing efficiency

Abstract

Use of a fluorescent organic molecule consisting of binaphthyl functionalized with donor-acceptor substituted stilbenes for the detection of dinitrotoluene (DNT) and trinitrotoluene (TNT) vapors and enhancement in its sensing efficiency via self-assembly assisted morphology tuning are described.

Highly Sensitive Determination of 2,4,6-Trinitrotoluene and Related Byproducts Using a Diol Functionalized Column for High Performance Liquid Chromatography

“…Despite the peaks of ADNT isomers were the closest to each other amongst tested analytes, the selectivity factor of ADNTs was close to 1, ensuring that the analysis of diol column is robust (Table 3). The calibration curve results ensured that the adequate analyte identification was achieved [24], [25], [26], [27], [28], [29], [30], [31], [32], [33]. In addition, the use of a LC/QTOF as well as a LC/TOF system yielded the same results with the HPLC-UV system, excluding trivial concentration and retention time differences due to the conditioning of those systems (data not shown).…”

“…TNT and its byproducts have high charge-transfer capabilities [29]. The order of the relative charge transfer capability for TATD is thought to be TNT; 2,4-DNT; 2-6-DNT; 2-ADNT; and 4-ADNT; as TNT is the highest [32]. Therefore, TNT retarded before than 2,4-DNT.…”

Branched benzothiadiazole-cored oligomers with terminal carbazoles: Synthesis and fluorescence probing nitroaromatics

“…S7eS8). Therefore, the photo-induced electron transfer might take place between the synthesized benzothiadiazole derivatives and nitro compounds, leading to fluorescence quenching [22].…”

“…The reason might be that the driving forces for the photo-induced electron transfer between 1 and the quenchers (0.72 eV and 1.22 eV for DNT and TNT) were lower than those between 2 and the quenchers (0.81 eV and 1.31 eV for DNT and TNT) (See Figs. S7 and S8) [22]. It is known that the morphology of the film affected the sensitivity of the sensory materials [24].…”

“…S9, we found that the emission intensities of oligomers 1 and 2 decreased gradually with increasing the concentration of the quenchers, and the fluorescence quenching data were obtained using SterneVolmer equation: where F 0 is the initial emission intensity of the probe prior to the addition of the quencher, F is the emission intensity at given concentration of the quencher [Q], and K sv is the SterneVolmer constant [23]. It was clear that the linear SterneVolmer plots were obtained from the fluorescence quenching titration profiles, meaning that the photo-induced electron transfer happened between the emitters and the quenchers [22]. Moreover, the fluorescence lifetime of 2 in THF was 5.44 ns, which was reduced to 3.65 ns after addition of DNT (Fig.…”