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Li M, Xie K, Wang G, Zheng J, Cao Y, Wei F, Tu H, Tang J. A Formaldehyde Sensor Based on Self-Assembled Monolayers of Oxidized Thiophene Derivatives. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:5916-5922. [PMID: 33909431 DOI: 10.1021/acs.langmuir.1c00396] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
High-performance formaldehyde sensors play an important role in air quality assessment. Herein, a self-assembled monolayer (SAM) sensor for trace formaldehyde (FA) is fabricated based on the fluorescence enhancement of oxidized thiophene derivatives. In the primary SAM molecules, the functional backbone trithiophene (3T) links to the anchor through an n-propyl group. The anchor with an active Si-Cl bond can form a covalent bond with the SiO2 substrate by solution incubation, which ensures good stability against organic solvents and high sensitivity via monolayer structures. With the alkyl chain's leading, a dense 3T SAM can be obtained on SiO2. Upon exposure to UV light in the presence of oxygen, 3T can be oxidized into a nonfluorescent but coordination-active product with abundant carbonyl groups, which can be doped with FA and induce a blueshifted fluorescence. With this mechanism, we proposed an SAM-based FA sensor by detecting the enhancement of the blueshifted fluorescence. Reliable reversibility, selectivity, stability, and detection limit lower than 1 ppm are achieved in this system. The work provides an experimental basis for developing a cheap, efficient, and flexible sensor for trace FA detection.
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Affiliation(s)
- Mingliang Li
- Department of Chemistry, The University of Hong Kong, Hong Kong 999077, China
| | - Kefeng Xie
- School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
| | - Guozhi Wang
- GRIMAT Engineering Institute Co., Ltd, Beijing 101407, P. R. China
- State Key Laboratory of Advanced Materials for Smart Sensing, General Research Institute for Nonferrous Metals, Beijing 100088, P. R. China
| | - Jing Zheng
- Department of Chemistry, The University of Hong Kong, Hong Kong 999077, China
| | - Yingnan Cao
- Department of Chemistry, The University of Hong Kong, Hong Kong 999077, China
| | - Feng Wei
- GRIMAT Engineering Institute Co., Ltd, Beijing 101407, P. R. China
- State Key Laboratory of Advanced Materials for Smart Sensing, General Research Institute for Nonferrous Metals, Beijing 100088, P. R. China
| | - Hailing Tu
- GRIMAT Engineering Institute Co., Ltd, Beijing 101407, P. R. China
- State Key Laboratory of Advanced Materials for Smart Sensing, General Research Institute for Nonferrous Metals, Beijing 100088, P. R. China
| | - Jinyao Tang
- Department of Chemistry, The University of Hong Kong, Hong Kong 999077, China
- State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong Kong 999077, China
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Ilkar Erdagi S, Doganci E, Uyanik C, Yilmaz F. Heterobifunctional poly(ε-caprolactone): Synthesis of α-cholesterol-ω-pyrene PCL via combination of ring-opening polymerization and “click” chemistry. REACT FUNCT POLYM 2016. [DOI: 10.1016/j.reactfunctpolym.2015.12.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Ramin MA, Le Bourdon G, Heuzé K, Degueil M, Buffeteau T, Bennetau B, Vellutini L. Epoxy-terminated self-assembled monolayers containing internal urea or amide groups. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:2783-2789. [PMID: 25679263 DOI: 10.1021/la5049375] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report the synthesis of new coupling agents with internal amide or urea groups possessing an epoxy-terminal group and trimethoxysilyl-anchoring group. The structural characterizations of the corresponding self-assembled monolayers (SAMs) were performed by polarization modulation infrared reflection adsorption spectroscopy (PM-IRRAS). The molecular assembly is mainly based on the intermolecular hydrogen-bonding between adjacent amide or urea groups in the monolayers. Because of the steric hindrance of amide or urea groups, the distance between the alkyl chains is too large to establish van der Waals interactions, inducing their disorder. The reactivity of the epoxy-terminal groups was successfully investigated through reaction with a fluorescent probe. We show that SAMs containing internal urea or amide groups exhibited a higher density of accessible epoxide groups than the corresponding long-chain (C22) glycidyl-terminated SAM.
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Affiliation(s)
- Michaël A Ramin
- ISM, UMR 5255 CNRS, Université de Bordeaux , 351 cours de la Liberation CS 10004, 33 405 Talence, France
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Chang X, Wang G, Yu C, Wang Y, He M, Fan J, Fang Y. Studies on the photochemical stabilities of some fluorescent films based on pyrene and pyrenyl derivatives. J Photochem Photobiol A Chem 2015. [DOI: 10.1016/j.jphotochem.2014.10.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Chuang PH, Gu Q, Tseng YH, Chen CL. Estimation of electron transfer properties of ferrocenyl-dicholesteryl-peptide in liquid and gel. J Colloid Interface Sci 2014; 417:310-6. [PMID: 24407692 DOI: 10.1016/j.jcis.2013.11.055] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 11/18/2013] [Accepted: 11/19/2013] [Indexed: 10/26/2022]
Abstract
Molecular dynamics simulations were carried out to investigate the conformations of ferrocenyl-dicholesteryl N-formamidoformamide (Fc-LS2) molecules in solvents of methanol and 1-propanol. Fc-LS2 comprises ferrocene and cholesteryl units linked by a biocompatible N-formamidoformamide peptide unit. Our results showed that Fc-LS2 formed a gel with 1-propanol but not with methanol. Charge-transfer properties of Fc-LS2/1-propanol gel and Fc-LS2/methanol liquid were also investigated by quantum mechanical (QM) calculations. The QM results indicate that the amino acid linkages contribute to improved charge-transport properties and the transfer integrals of Fc-LS2/1-propanol are larger than those of Fc-LS2/methanol.
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Affiliation(s)
- Po-Hsiang Chuang
- Department of Chemistry, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, ROC
| | - Qirui Gu
- Department of Chemistry, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, ROC
| | - Yu-Hui Tseng
- Department of Chemistry, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, ROC
| | - Cheng-Lung Chen
- Department of Chemistry, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, ROC.
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Barathi P, Kumar AS. Electrochemical conversion of unreactive pyrene to highly redox-active 1,2-quinone derivatives on a carbon nanotube-modified gold electrode surface and its selective hydrogen peroxide sensing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:10617-10623. [PMID: 23930943 DOI: 10.1021/la402092r] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Pyrene (PYR) is a rigid, carcinogenic, unreactive, and nonelectrooxidizable compound. A multiwalled carbon nanotube (MWCNT)-modified gold electrode surface-bound electrochemical oxidation of PYR to a highly redox-active surface-confined quinone derivative (PYRO) at an applied potential of 1 V versus Ag/AgCl in pH 7 phosphate buffer solution has been demonstrated in this work. Among various carbon nanomaterials examined, the pristine MWCNT-modified gold electrode showed effective electrochemical oxidation of the PYR. The MWCNT's graphite impurity promotes the electrochemical oxidation reaction. Physicochemical and electrochemical characterizations of MWCNT@PYRO by Raman spectroscopy, FT-IR, X-ray photoelectron spectroscopy, and GC-MS reveal the presence of PYRO as pyrene-tetrone within the modified electrode. The quinone position of PYRO was identified as ortho-directing by an elegantly designed ortho-isomer-selective complexation reaction with copper ion as an MWCNT@PYRO-Cu(2+/1+)-modified electrode. Finally, a cytochrome c enzyme-modified Au/MWCNT@PYRO (i.e., Au/MWCNT@PYRO-Cyt c) was also developed and further demonstrated for the selective biosensing of hydrogen peroxide.
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Affiliation(s)
- Palani Barathi
- Environmental and Analytical Chemistry Division, School of Advanced Sciences, Vellore Institute of Technology University, Vellore-632 014, India
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Schlecht CA, Johnson DM, Maurer JA. Creation and control of defined protein patterns on glass: alkyl chain length controls stability. RSC Adv 2013. [DOI: 10.1039/c3ra21668c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Yan J, Liu J, Sun Y, Jing P, He P, Gao D, Fang Y. Oligo(FcDC-co-CholDEA) with Ferrocene in the Main Chain and Cholesterol as a Pendant Group—Preparation and Unusual Properties. J Phys Chem B 2010; 114:13116-20. [DOI: 10.1021/jp1032838] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Junlin Yan
- Key Laboratory of Applied Surface and Colloid Chemistry, MOE, School of Chemistry and Materials Science, Shaanxi Normal University, Xi’an, 710062, China
| | - Jing Liu
- Key Laboratory of Applied Surface and Colloid Chemistry, MOE, School of Chemistry and Materials Science, Shaanxi Normal University, Xi’an, 710062, China
| | - Yuanhui Sun
- Key Laboratory of Applied Surface and Colloid Chemistry, MOE, School of Chemistry and Materials Science, Shaanxi Normal University, Xi’an, 710062, China
| | - Ping Jing
- Key Laboratory of Applied Surface and Colloid Chemistry, MOE, School of Chemistry and Materials Science, Shaanxi Normal University, Xi’an, 710062, China
| | - Panli He
- Key Laboratory of Applied Surface and Colloid Chemistry, MOE, School of Chemistry and Materials Science, Shaanxi Normal University, Xi’an, 710062, China
| | - Di Gao
- Key Laboratory of Applied Surface and Colloid Chemistry, MOE, School of Chemistry and Materials Science, Shaanxi Normal University, Xi’an, 710062, China
| | - Yu Fang
- Key Laboratory of Applied Surface and Colloid Chemistry, MOE, School of Chemistry and Materials Science, Shaanxi Normal University, Xi’an, 710062, China
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Domińska M, Blanchard GJ. Constituent-dependent liposome structure and organization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:1043-1050. [PMID: 19754058 DOI: 10.1021/la9023037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We have used steady state and time-resolved fluorescence spectroscopy in concert with TEM to study organization and dynamics of molecules comprising liposomes, discoidal micelles, and spherical micelles. The lipid aggregates contained controlled amounts of lipids with headgroups modified with a thiol-terminated polyethylene glycol (thio-PEG lipids) and a small amount of 1-palmitoyl-2-(pyrene-1-yl)decanoyl-sn-glycero-3-phosphocholine (pyrene tethered DPPC), pyrene, or perylene as spectroscopic probes. The maximum diameter of the lipid aggregates was controlled by the polycarbonate filter pore size used in the extrusion process. The concentration of thio-PEG lipid in the aggregates determines not only the shape of the lipid assemblies but also the organization of the molecules within the assembly. Fluorescence lifetime and anisotropy decay data show that the immediate environment of pyrene tethered DPPC changes with the addition of thio-PEG lipid. In contrast, the dynamics of free chromophore (perylene) are insensitive to the addition of thio-PEG lipid. The addition of thio-PEG lipid to the lipid assembly produces changes in organization that are most pronounced in the lipid headgroup region. Reorientation dynamics of perylene show that the organization of the lipid bilayer acyl chain region is affected little by the addition of thio-PEG lipid and consequent macroscopic changes in the morphology of the lipid assemblies.
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Affiliation(s)
- Monika Domińska
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824-1322, USA
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Lü F, Fang Y, Blanchard GJ. Probing the microenvironment of surface-attached pyrene formed by a thermo-responsive oligomer. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2009; 74:991-999. [PMID: 19796986 DOI: 10.1016/j.saa.2009.09.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2009] [Accepted: 09/04/2009] [Indexed: 05/28/2023]
Abstract
We have constructed a novel molecular assembly attached to quartz, oxidized silicon and indium-doped tin oxide coated substrates, where a tethered pyrene derivative is co-immobilized with oligo-N-isopropyl acrylamide (oligo-NIPAM). The addition of tethered oligo-NIPAM to the adlayer creates two different, temperature-dependent microenvironments for the surface-bound pyrene. X-ray photoelectron spectroscopy (XPS) and ellipsometry measurements demonstrate the covalent attachment of both oligo-NIPAM and pyrene in our adlayers. Contact angle results confirm the thermo-responsive nature of the oligo-NIPAM on the substrate surface. Steady-state fluorescence data show that the presence of oligo-NIPAM moieties reduces the extent of pyrene excimer formation and provides different environments for the chromophore at temperatures above and below the phase transition. Fluorescence lifetime decay data on surface-bound pyrene are biexponential, consistent with multiple local environments, regardless of whether tethered oligo-NIPAM is present or not. Quenching studies reveal that we can manipulate the sensing properties of this new film simply by adjusting the conformations of oligo-NIPAM.
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Affiliation(s)
- Fengting Lü
- School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an 710062, PR China
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Ding L, Domińska M, Fang Y, Blanchard G. Fluorescence and electrochemistry studies of pyrene-functionalized surface adlayers to probe the microenvironment formed by cholesterol. Electrochim Acta 2008. [DOI: 10.1016/j.electacta.2007.12.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Lü F, Fang Y, Blanchard GJ. Surface-confined energy transfer in mixed self-assembled monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:8752-8759. [PMID: 18605747 DOI: 10.1021/la801022h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We have fabricated a set of self-assembled monolayers consisting of naphthalene and dansyl derivatives in a range of surface loading ratios for the purpose of examining excitation transport in mixed self-assembled monolayer systems. Both tethered chromophores were immobilized on an epoxide-terminated adlayer on silica via an identical spacer, where the linking chemistry produced an amide linkage. X-ray photoelectron spectroscopy (XPS), ellipsometry, and contact angle measurements were used to characterize these chromophore-containing layers. The excitation transfer behavior of these monolayers has been examined using steady-state and time-resolved fluorescence spectroscopy. Steady-state fluorescence measurements show that excitation transfer from the naphthalene to dansyl chromophores occurs, with the efficiency of excitation transport scaling with chromophore surface loading densities, as expected. The donor lifetimes decrease with increasing acceptor loading density, and the functional form of the acceptor decay was independent of the donor/acceptor ratio. Our findings are not consistent with a homogeneous adlayer, but do provide information on the structural heterogeneity that is characteristic of these interfaces.
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Affiliation(s)
- Fengting Lü
- School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an, PR China
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