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Chiral Sensor

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https://read.qxmd.com/read/30876258/active-perfect-absorber-based-on-planar-anisotropic-chiral-metamaterials
#1
Xiu Yang, Min Li, Yidong Hou, Jinglei Du, Fuhua Gao
Active chiral plasmonics have attracted a considerable amount of research interest for their power to switch the handedness of chiral metamaterials and the potential applications in highly integrated polarization sensitive devices, stereo display fields, and so on. In this work, we propose a kind of active chiral metamaterial absorber (ACMA) composed by planar anisotropic chiral metamaterials (PACMs) and a metal layer. Our in-depth theoretical analysis indicates that the circular conversion dichroism (CCD) from PACMs plays a crucial role to achieve the active chiroptical effect...
March 4, 2019: Optics Express
https://read.qxmd.com/read/30850600/time-space-resolved-origami-hierarchical-electronics-for-ultrasensitive-detection-of-physical-and-chemical-stimuli
#2
Min Zhang, Jiaxing Jeccy Sun, Muhammad Khatib, Zi-Yang Lin, Zi-Han Chen, Walaa Saliba, A'laa Gharra, Yehu David Horev, Viki Kloper, Yana Milyutin, Tan-Phat Huynh, Simon Brandon, Guoyue Shi, Hossam Haick
Recent years have witnessed thriving progress of flexible and portable electronics, with very high demand for cost-effective and tailor-made multifunctional devices. Here, we report on an ingenious origami hierarchical sensor array (OHSA) written with a conductive ink. Thanks to origami as a controllable hierarchical framework for loading ink material, we have demonstrated that OHSA possesses unique time-space-resolved, high-discriminative pattern recognition (TSR-HDPR) features, qualifying it as a smart sensing device for simultaneous sensing and distinguishing of complex physical and chemical stimuli, including temperature, relative humidity, light and volatile organic compounds (VOCs)...
March 8, 2019: Nature Communications
https://read.qxmd.com/read/30835426/chiral-selectivity-of-porphyrin-zno-nanoparticle-conjugates
#3
Manuela Stefanelli, Gabriele Magna, Francesca Zurlo, Maria Federica Caso, Elisabetta di Bartolomeo, Simonetta Antonaroli, Mariano Venanzi, Roberto Paolesse, Corrado Di Natale, Donato Monti
The recognition of enantiomers is one of the most arduous challenges in chemical sensor development. Although several chiral systems exist, their effective exploitation as the sensitive layer in chemical sensors is hampered by several practical implications that hinder stereoselective recognition in solid-state. In this paper we report a new methodology to efficiently prepare chiral solid films, by using a hybrid material approach where chiral porphyrin derivatives are grafted onto zinc oxide nanoparticles...
March 5, 2019: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/30812021/optoelectrical-and-mechanical-properties-of-multiwall-carbon-nanotube-integrated-dna-thin-films
#4
Mallikarjuna Reddy Kesama, Sreekantha Reddy Dugasani, Yun Jeong Cha, Junyoung Son, Bramaramba Gnapareddy, Sanghyun Yoo, Dong Ki Yoon, Sung Ha Park
Thin films made of deoxyribonucleic acid (DNA), dissolved in an aqueous solution, and cetyltrimethyl-ammonium (CTMA)-modified DNA (CDNA), dissolved in an organic solvent, utilising multiwall carbon nanotubes (MWCNTs) are not yet well-understood for use in optoelectronic device and sensor applications. In this study, we fabricate MWCNT-integrated DNA and CDNA thin films using the drop-casting method. We also characterise the optical properties (i.e., absorption spectra, Fourier-transform infrared spectra, Raman spectra, photoluminescence, and time of flight-secondary ion mass spectrometry) to study spectral absorption, interaction, functional group, chirality, and compositional moiety and its distribution of MWCNTs in DNA and CDNA thin films...
February 27, 2019: Nanotechnology
https://read.qxmd.com/read/30786148/stimuli-directed-colorimetric-interconversion-of-helical-polymers-accompanied-by-a-tunable-self-assembly-process
#5
Rafael Rodríguez, Emilio Quiñoá, Ricardo Riguera, Félix Freire
Interconversion between extended and bent structures at the pendant groups of a chiral polyene framework [poly(phenylacetylene) with (R)-(2-methoxy-2-phenylacetyl)glycine residues linked to 4-vinylanilines] allows the reversible colorimetric transformation from stretched to compressed helical cis-transoid polyenic structures through manipulation of the flexible spacer. This transformation generates either organogels (stretched helical form) or nanoparticles (compressed helical form) under the control of polar/low polar stimuli respectively and opens the way to the development of new sensors and stimuli-sensitive materials based on these concepts...
February 20, 2019: Small
https://read.qxmd.com/read/30771980/a-novel-fluorescence-turn-off-on-sensor-based-on-n-doped-graphene-quantum-dots-in-amino-acid-ionic-liquid-medium-and-its-application
#6
Wei Liu, Xiashi Zhu
The spectrum behavior of N-doped graphene quantum dots (N-GQD) in 1-hexyl-3-methylimidazolium tryptophan ionic liquid (TryIL) was studied. It was showed that TryIL could self-aggregate into water/oil micellar in aqueous solution and N-GQD was assembled on hydrophilic part of TryIL micelle to construct a novel fluorescence "turn on-off" probe (N-GQD-TryIL). the fluorescence intensity was quenched through the formation of N-GQD-TryIL-Cu(II) complex due to the strong binding ability between Cu2+ and N-GQD-TryIL...
May 15, 2019: Talanta
https://read.qxmd.com/read/30682770/an-enantioselective-potentiometric-sensor-for-2-amino-1-butanol-based-on-chiral-porous-organic-cage-cc3-r
#7
Bang-Jin Wang, Ai-Hong Duan, Jun-Hui Zhang, Sheng-Ming Xie, Qiu-E Cao, Li-Ming Yuan
Porous organic cages (POCs) have attracted extensive attention due to their unique structures and tremendous application potential in numerous areas. In this study, an enantioselective potentiometric sensor composed of a polyvinyl chloride (PVC) membrane electrode modified with CC3-R POC material was used for the recognition of enantiomers of 2-amino-1-butanol. After optimisation, the developed sensor exhibited enantioselectivity toward S -2-amino-1-butanol ( log K S , R P o t = -0.98) with acceptable sensitivity, and a near-Nernstian response of 25...
January 24, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://read.qxmd.com/read/30661582/carbon-dot-decorated-porous-organic-cage-as-fluorescent-sensor-for-rapid-discrimination-of-nitrophenol-isomers-and-chiral-alcohols
#8
Zhenyu Lu, Xiaotian Lu, Yanhui Zhong, Yufei Hu, Gongke Li, Runkun Zhang
Isomers discrimination plays a vital role in modern chemistry, and development of efficient and rapid method to achieve this aim has attracted a great deal of interest. In this work, a novel carbon dot-decorated chiral porous organic cage hybrid nanocomposite (CD@RCC3) was prepared and used to fabricate fluorescent sensor. The resultant CD@RCC3 was characterized by using a range of techniques, finding that CD@RCC3 possesses strong and stable fluorescent property in common organic solvents, especially it exhibits chiral property...
March 7, 2019: Analytica Chimica Acta
https://read.qxmd.com/read/30650964/dual-signal-electrochemical-enantiospecific-recognition-system-via-competitive-supramolecular-host-guest-interactions-the-case-of-phenylalanine
#9
Yinhui Yi, Depeng Zhang, Yuzhi Ma, Xiangyang Wu, Gangbing Zhu
For developing highly selective and sensitive electrochemical sensors for chiral recognition, taking advantage of the synthetical properties of β-cyclodextrin (β-CD, strong host-guest recognition) and carbon nanotubes wrapped with reduced graphene oxide (CNTs@rGO, excellent electrochemical property and large surface area) as well as the differences in binding affinity between β-CD and guest molecules, a dual signal electrochemical sensing strategy was proposed herein for the first time in chiral recognition based on the competitive host-guest interaction between probe and chiral isomers with β-CD/CNTs@rGO...
January 17, 2019: Analytical Chemistry
https://read.qxmd.com/read/30644729/enantiomers-of-single-chirality-nanotube-as-chiral-recognition-interface-for-enhanced-electrochemical-chiral-analysis
#10
Chunling Pu, Yunxia Xu, Qi Liu, Anwei Zhu, Guoyue Shi
Although separation of single-walled carbon nanotubes (SWCNTs) according to their helicity and handedness has been attracting tremendous interest recently, exploration of the left- and right-handed SWCNT enantiomers (defined as M and P) to chiral sensing still remains in the early stage. Here we presented a new electrochemical sensor for chiral discrimination, which for the first time amplified the chiral selection on the electrode surface based on the left- or right-handed semiconducting SWCNT enantiomers with (6, 5)-enriched chirality...
January 15, 2019: Analytical Chemistry
https://read.qxmd.com/read/30633293/kinetic-and-spectroscopic-studies-on-the-chiral-self-aggregation-of-amphiphilic-zinc-and-copper-l-prolinate-tetraarylporphyrin-derivatives-in-different-aqueous-media
#11
Fabrizio Caroleo, Manuela Stefanelli, Gabriele Magna, Mariano Venanzi, Roberto Paolesse, Simona Sennato, Marilena Carbone, Donato Monti
The self-aggregation of inherently chiral, (l)-proline functionalised Cu and Zn porphyrin derivatives has been investigated in different aqueous organic solvent media. The results indicate that the title species form self-assembled structures expressing supramolecular chirality by the amplification of the stereochemical information stored on the l-prolinate functionality. A substantial difference of the aggregation modes, and the chiroptical features of the final supramolecular species for the two investigated complexes, is clearly imputable to the metal ions, having a different coordination ability toward solvent molecules...
January 11, 2019: Organic & Biomolecular Chemistry
https://read.qxmd.com/read/30625594/a-novel-electrochemical-chiral-interface-based-on-the-synergistic-effect-of-polysaccharides-for-the-recognition-of-tyrosine-enantiomers
#12
Jiao Zou, Xiao-Qing Chen, Guo-Qing Zhao, Xin-Yu Jiang, Fei-Peng Jiao, Jin-Gang Yu
Electrochemical chiral interface based on two polysaccharides, soluble starch (SS) and chitosan (CS), was fabricated and used for chiral recognition of tyrosine (Tyr) enantiomers via square wave voltammetry (SWV). The SS-CS composite was characterized by scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) method. Under the optimized experimental conditions, the oxidation peak current ratio of L-Tyr to D-Tyr (IL /ID ) and the difference between the peak potential (ΔEp = ED - EL ) were observed to be 1...
April 1, 2019: Talanta
https://read.qxmd.com/read/30625547/a-highly-efficient-chiral-sensing-platform-for-tryptophan-isomers-based-on-a-coordination-self-assembly
#13
Peng Lei, Ying Zhou, Guomei Zhang, Yan Zhang, Caihong Zhang, Shasha Hong, Yajuan Yang, Chuan Dong, Shaomin Shuang
Construction of convenient and effective method for enantiomer identification is of vital significance for biochemistry and medical science. Herein, we design an effective sensor for chiral recognition of tryptophan (Trp) enantiomers, and self-assembly of Cu2+ -modified β-cyclodextrin on poly-L-arginine/multi-walled carbon nanotubes (Cu-β-CD/PLA/MWCNTs) is studied. Meanwhile, Cu2+ acts as a cap to prevent the release of the high energy water and compel Trp enantiomer into the smaller opening of β-cyclodextrin...
April 1, 2019: Talanta
https://read.qxmd.com/read/30552322/click-chemistry-enables-quantitative-chiroptical-sensing-of-chiral-compounds-in-protic-media-and-complex-mixtures
#14
F Yushra Thanzeel, Kaluvu Balaraman, Christian Wolf
Click reactions have become powerful synthetic tools with unique applications in the health and materials sciences. Despite the progress with optical sensors that exploit the principles of dynamic covalent chemistry, metal coordination or supramolecular assemblies, quantitative analysis of complex mixtures remains challenging. Herein, we report the use of a readily available coumarin conjugate acceptor for chiroptical click chirality sensing of the absolute configuration, concentration and enantiomeric excess of several compound classes...
December 14, 2018: Nature Communications
https://read.qxmd.com/read/30474891/hydrostatic-pressure-on-toroidal-interaction-and-propeller-chirality-of-hexaarylbenzenes-explicit-solvent-effects-on-differential-volumes-in-methylcyclohexane-and-hexane
#15
Tomoyo Kosaka, Satono Iwai, Gaku Fukuhara, Yoshitane Imai, Tadashi Mori
A unique and effective interaction between the peripheral aromatic blades makes hexaarylbenzenes (HABs) attractive in fundamental research as well as various applications such as molecular wires, sensors, and supramolecular assemblies. The chiroptical responses of HABs are susceptible to environmental factors such as solvent and temperature due to the dynamic conformational transitions between the conformers. In this study, pressure dependence on the propeller chiral HABs in two different solvents was studied in detail...
November 26, 2018: Chemistry: a European Journal
https://read.qxmd.com/read/30470002/probing-bianisotropic-biomolecules-via-a-surface-plasmon-resonance-sensor
#16
Maoyan Wang, Hailong Li, Tong Xu, Hu Zheng, Mengxia Yu, Guiping Li, Jun Xu, Jian Wu
The transfer matrix method is developed to probe bianisotropic biomolecules via a Kretschmann configuration surface plasmon resonance (SPR) sensor. This method employs wave vectors and 4 × 4 transfer matrices derived by using anisotropic and magnetoelectric coupling constitutive relations. The transfer matrices relate four eigenstates and trace four transverse field components through the multilayer to account for cross-polarization coupling due to the chirality of the biomolecule layer. The validity of the method is confirmed by means of numerical results...
October 29, 2018: Optics Express
https://read.qxmd.com/read/30411759/a-facile-route-to-prepare-functional-mesoporous-organosilica-spheres-with-electroactive-units-for-chiral-recognition-of-amino-acids
#17
Datong Wu, Wensheng Tan, Hongda Li, Zhangchen Lei, Linhong Deng, Yong Kong
Conductive materials are valuable supports and widely applied in electrochemical analysis. In the current article, a mesoporous organosilica sphere (S,S)-CPMO-3 with the chiral group and electroactive units is presented. The organosilicon framework is composed of free ions belonging to the ionic liquid and the chiral group arising from (1S,2S)-1,2-diaminocyclohexane. Next, a bare electrode was modified by the as-synthesized composite material to construct the new electrochemical sensor (S,S)-CPMO-3-GCE. It was observed that (S,S)-CPMO-3-GCE exhibited favourable enantioselective recognition in the response of the peak current (Ip) and the peak potential (Ep) to the different configurations of amino acids...
November 9, 2018: Analyst
https://read.qxmd.com/read/30335967/free-standing-plasmonic-chiral-metamaterials-with-3d-resonance-cavities
#18
Zengyao Wang, Bin Ai, Ziwei Zhou, Yuduo Guan, Helmuth Möhwald, Gang Zhang
Hollow nanocone array (HNCA) films (cm × cm), composed of two Ag and Au nanoshells, are fabricated via a low-cost and efficient colloidal lithography technique. The relative position of the Ag and Au nanoshells can be controlled to generate various chiral asymmetries. A pronounced chiroptical response is observed in the ultraviolet-visible region with the anisotropy factor up to 10-1 , which is rooted in the asymmetric current oscillations and electric field distributions. Beyond previous reports on plasmonic chiral metamaterials, the HNCA can be free-standing and further transferred to other functional and flexible substrates, such as polydimethylsiloxane (PDMS), highly curved surfaces, prepatterned films, and hydrogels, while keeping the original features...
November 27, 2018: ACS Nano
https://read.qxmd.com/read/30298737/nanofilamentous-virus-based-dynamic-hydrogels-with-tunable-internal-structures-injectability-self-healing-and-sugar-responsiveness-at-physiological-ph
#19
Xueli Zhi, Chunxiong Zheng, Jie Xiong, Jianyao Li, Chenxi Zhao, Linqi Shi, Zhenkun Zhang
With expanding applications of hydrogels in diverse fields ranging from biomaterials to sensors, actuators, and soft robotics, there is an urgent need to endow one single gel with multiple physicochemical properties, such as stimuli-responsiveness, injectability, self-healing, and tunable internal structures. However, it is challenging to simultaneously incorporate these highly sought-after properties into one single gel. Herein, a conceptual hydrogel system with all of these properties is presented via combining bioconjugate chemistry, filamentous viruses, and dynamic covalent bonds...
October 30, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://read.qxmd.com/read/30284766/stereoselective-sensing-of-l-and-d-amino-acids-development-of-a-fluorescence-array-based-on-readily-available-chiral-phosphoric-acids
#20
Frescilia Octa-Smolin, Jochen Niemeyer
The identification of structurally related analytes has become possible using sensor arrays, based on sets of cross-reactive chemosensors. This work reports the use of readily available chiral phosphoric acids for the array-based, chemo- and stereoselective sensing of l- and d-amino acids. Six bis- and trisphosphoric acids were used in combination with Ni2+ and Eu3+ , resulting in a set of twelve chiral fluorescent chemosensors. This sensor-array enables a correct classification of l-amino acids with 100 % accuracy, while the differentiation between l- and d-amino acids can be achieved with 94 % accuracy...
November 7, 2018: Chemistry: a European Journal
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