Chemi-Impeditive Sensing Platform Based on Single-Walled Carbon Nanotubes DOI
Seok Hee Han,

Thomas N. Pioch,

Timothy M. Swager

et al.

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(46), P. 31486 - 31496

Published: Nov. 6, 2024

Chemical sensing methodology based on electrochemical impedance spectroscopy (EIS) targeting analytes in aqueous samples functionalized single-walled carbon nanotube (SWCNT) is reported. The SWCNT contact with electrolyte shows unique spectra that cannot be analyzed classical equivalent circuit models. Inspired by the charge transport property of mixed ionic-electronic conductors, we propose an transmission line model (TLM), which CNT-electrolyte system can to track down all parameters. By combining multiple pieces information, are technically immeasurable conventional chemiresistive or chemicapacitive techniques, several analyte species responding sensor differentiated from each other. We demonstrate "chemi-impeditive" concept chemically modified SWCNTs for detecting perfluoroalkyl substances (PFAS) solutions. EIS coupled a fluorination chemistry surface provides changes components PFAS, i.e., CNT and solution resistances, as well interfacial CNT-solution capacitance, through perfluorooctanesulfonic acid, perfluorooctanoic hexafluoropropylene oxide dimer perfluorobutanesulfonic acid detected discriminative manner. new impedimetric method opens up vistas chemical analysis additional dimension information beyond single resistance capacitance typically measured many types sensors.

Language: Английский

Cationic covalent organic framework for the fluorescent sensing and cooperative adsorption of perfluorooctanoic acid DOI Creative Commons
Asmaa Jrad,

Gobinda Das,

Nour Alkhatib

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Dec. 2, 2024

Language: Английский

Citations

8
Addressing the Persistence of Per- and Poly-fluoroalkyl substances (PFAS): Current Challenges and Potential Solutions DOI Creative Commons
Emeka J. Itumoh,

Shailja Data,

Jack L.‐Y. Chen

et al.

RSC Sustainability, Journal Year: 2024, Volume and Issue: 2(11), P. 3183 - 3201

Published: Jan. 1, 2024

The combined stability, mobility, and bioaccumulation of per- poly-fluoroalkyl substances (PFAS) has prompted a global environmental crisis.

Language: Английский

Citations

6
Molecule-Probed Raman Spectroscopy for Femtogram-per-Liter Level Per- and Polyfluoroalkyl Substances Detection DOI Creative Commons
Bo Li, Liang Zhao, Jiayue Hu

et al.

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 12, 2025

Abstract Per- and poly-fluoroalkyl substances (PFAS) have received significant attention due to their persistence in the environment. Because of accumulative nature, even trace amounts can adversely impact human health ecosystems. Here, we present Molecule-Probed Raman Spectroscopy (MPRS), an ultra-sensitive, low-cost, fast method that achieve femtogram-per-liter detection PFAS, surpassing any existing methods by at least four orders magnitude. In contrast monitoring spectrum MPRS monitors changes molecular probes, methyl group (-CH3) on polydimethylsiloxane, upon PFAS capture. succeeds detecting multiple individual water complex matrices such as surface blood. We also demonstrated feasibility on-site using a portable spectrometer. Beyond its transformative capability, establishes new analyte paradigm, paving way for innovative material systems instruments.

Language: Английский

Citations

0
Dual-modal detection of perfluorooctanoic acid (PFOA) using a single polymer platform: ACQ and IDA approaches DOI Creative Commons
Arvin Sain Tanwar, Parameswar Krishnan Iyer, F. Meyer

et al.

RSC Applied Polymers, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

The fluorescent PPMI polymer exhibits aggregation-caused quenching (ACQ) and indicator displacement assay (IDA) “turn-on” responses towards perfluorooctanoic acid in aqueous media, with limits of detection 0.21 μM 16.1 nM, respectively.

Language: Английский

Citations

0
A stable dual-functional monomer imprinted polymer platform for electrochemical sensitive detection of PFAS DOI

Xingyang Cheng,

Jing Tang, Yu Chen

et al.

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: 493, P. 138422 - 138422

Published: April 27, 2025

Language: Английский

Citations

0
Measurement of Anisotropic Exciton Transport Lengths in Organic Crystals Using Photoetching DOI
Yangyang Ren,

Chenglong Liao,

Yanxue Che

et al.

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 28, 2025

Abstract Measuring anisotropic exciton transport in organic crystals goes beyond just assessing one‐dimensional (1D) transport. It offers a deeper understanding of how molecular packing and interactions affect different dimensions. However, achieving nanoscale precision measuring lengths linking them to specific crystalline directions remains formidable challenge. Here the development photoetching method is reported visualize distances as gaps within two‐dimensional (2D) crystals, which turn allows for use scanning electron microscope (SEM) precisely measure sizes. The combined with hetero‐seeded self‐assembly enables conventional fluorescence spectrometry precise determination 2D structures at nanoscale. Relying on this novel method, unexpectedly found that increasing intermolecular one crystal direction not only improves dimension but also enhances other dimension. These findings provide valuable insights engineering materials require efficient across extended distances.

Language: Английский

Citations

0
Photoinduced Proton-Transfer-Mediated Molecular Recognition in Molecular Crystals DOI
Lishan Sun,

T.M. Zhang,

Yanxue Che

et al.

Analytical Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: April 29, 2025

Molecular recognition has traditionally been focused on ground-state interactions. However, leveraging photoenergy to access excited-state molecular recognition, which may enable enhanced sensitivity or selectivity that is unattainable in the ground state, remains underexplored. In this study, we demonstrate a novel photoinduced mechanism using self-assembled crystalline microribbons composed of donor-acceptor (D-A) molecule with twisted backbone for ultratrace phenol vapor detection. We confirm proton transfer occurs from C═N group pyridine moiety D-A system, generating protonated and phenoxide ion triggers fluorescence quenching. This proton-transfer-mediated endows exceptional toward vapor, achieving limit detection (LOD) 0.6 parts per trillion (ppt). Our findings reveal harnessing light energy drive opens new avenues advancing sensing technologies.

Language: Английский

Citations

0
Synergistic Integration of Aggregation-Induced Emission and FRET Mechanisms in Conjugated Polymers via Molecular Engineering for Ultrasensitive, Rapid, and Discriminative Detection of Perfluoroalkyl Substances DOI
Chenyang Zhao, Sameer Hussain, Jinke Li

et al.

Analytical Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: May 2, 2025

The global contamination of water bodies by persistent organic pollutants (perfluoroalkyl substances (PFAS)) has generated significant societal concern, emphasizing the urgent need for smart strategies their rapid, ultratrace, and on-site detection. Conjugated polymers (CPs) are exceptional fluorescence sensing materials with signal-amplification properties, yet performance is often hindered a conventional aggregation-caused quenching (ACQ) effect. Herein, we present two acceptor-engineered aggregation-induced emission (AIE)-active CPs (FTD-MI FTD-C8-MI) integrated efficient Förster resonance energy transfer (FRET) mechanisms ultralow detection PFAS. FTD-MI exhibits turn-off (cyan to dark) response, while FTD-C8-MI shows ratiometric red) response PFAS due synergistic effect AIE interchain FRET, facilitated electrostatic hydrophobic interactions upon binding. Both demonstrate excellent sensitivity at subnanomolar level toward most abundant PFAS, perfluorooctanoic acid (PFOA), perfluorooctanesulfonic (PFOS). mechanism been thoroughly investigated both experimental simulation studies. Additionally, an optical sensor array coupled machine learning algorithms established discriminative six types Finally, portable smartphone platform custom-designed "app" was developed real-time, on-site, semiquantitative analysis in actual samples. Thus, providing sensitive, portable, cost-effective, user-friendly solution, this work offers powerful tool monitoring pollution, ensuring safety, reducing risks public health.

Language: Английский

Citations

0
PolyPal: A Python Package for Molecular Dynamics Simulation of Amorphous Polymers DOI
Molly C. Warndorf, Timothy M. Swager, Alfredo Alexander‐Katz

et al.

Journal of Chemical Theory and Computation, Journal Year: 2025, Volume and Issue: unknown

Published: June 3, 2025

Easily tunable and processable, porous organic polymers (POPs) have found increasing utility in various applications. Molecular modeling simulations are invaluable tools polymer science but remain under-reported the POP literature. Accurate simulation of these materials could boost discovery high-performance POPs allow for a more thorough contribution to big data. These contain free volume-promoting structural units, such as iptycenes, exhibit high glass-transition temperatures, excellent thermal stability, functionality. However, popular transferable force fields utilized all-atomistic molecular dynamics (MD) not fully parametrized intrinsically thermoplastic materials. We present streamlined workflow MD nonporous amorphous In conjunction with programs ORCA, Q-Force, Assemble!, GROMACS, highly accessible methodology is established field (FF) parametrization, creation initial configurations, polymers. This protocol can reproduce experimental bulk densities fractional volume values polymeric accuracy has been made available Python package, called PolyPal. As an example, we our results using PolyPal on series that were previously synthesized experimentally characterized. FF was also validated through solid-state NMR studies. will only open new avenues rational design improved insight provide pathway simulating unexplored

Language: Английский

Citations

0
Aptamer-Triggered Nucleic Acid Amplification Strategy for the Electrochemiluminescence Detection of Perfluorooctanoic Acid DOI

Zhiwei Jing,

Rongfang Li,

Jinwen Zhao

et al.

Analytical Chemistry, Journal Year: 2024, Volume and Issue: 96(45), P. 18178 - 18186

Published: Oct. 29, 2024

Per- and polyfluoroalkyl substances (PFASs) are a class of persistent micropollutants. Due to their chemical stability bioaccumulation, concentrations PFASs in environmental media, even at ultratrace levels, pose significant health risks. However, currently reported detection methods lack an effective signal amplification strategy, the sensitivity is limited, which can not meet requirements detection. Herein, groundbreaking aptamer-recognition-driven nucleic acid strategy was developed significantly amplify perfluorooctanoic (PFOA). Furthermore, step pulse (SP) used instead cyclic voltammetry (CV) as electrochemical excitation method modulate low electrochemiluminescence (ECL) triggering potential poly [9,9-bis (3′-(N, N-dimethylamino) propyl) −2,7-fluorene]-alt-2,7-(9,9-dioctylfluorene)] (PFN) nanoparticles (NPs) so that strong +0.80 V emitted without any exogenous coreactants. PFN NPs coupled rolling circle amplification-assisted PAM-free CRISPR/Cas12a system construct ultrasensitive ECL aptasensor for PFOA limit 1.97 × 10–15 M. This integrated advantages no coreactants, trigger potential, provided monitoring trace real water sample.

Language: Английский

Citations

2