Methyl(—CH3)-terminated ZnO Nanowires for Selective Acetone Detection: Novel Approach Toward the Sensing Performance Enhancement Via Self-Assembly Molecules

2022 ◽  
Author(s):  
Mandeep Singh ◽  
Navpreet Kaur ◽  
Andrea Casotto ◽  
Luigi Sangaletti ◽  
Nicola Poli ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Self Assembly ◽  
Performance Enhancement ◽  
Zno Nanowires ◽  
Self Assembled Monolayers ◽  
Highly Efficient ◽  
Novel Approach ◽  
Assembled Monolayers ◽  
Acetone Detection ◽  
Sensing Performance

The inspiration behind this work is to show the importance to tailor metal oxides (MOX’s) nanowires with suitable self-assembled monolayers (SAM’s) for the development of highly efficient, selective, and low...

Stochastic Computing via In Operando Modulation of Rectification in Molecular Tunneling Junctions

2020 ◽  
Author(s):  
Xinkai Qiu ◽  
Sylvia Rousseva ◽  
Gang Ye ◽  
Jan C. Hummelen ◽  
Ryan Chiechi
Keyword(s):  
Self Assembly ◽  
Variable Temperature ◽  
Self Assembled Monolayers ◽  
Microfluidic Channels ◽  
Proof Of Concept ◽  
Glycol Ethers ◽  
Stochastic Computing ◽  
Assembled Monolayers ◽  
In Operando ◽  
Tunneling Junctions

This paper describes the reconfiguration of molecular tunneling junctions during operation via the self-assembly of bilayers of glycol ethers. We use well-established functional groups to modulate the magnitude and direction of rectification in assembled tunneling junctions by exposing them to solutions containing different glycol ethers. Variable-temperature measurements establish that rectification occurs by a bias-dependent tunneling-hopping mechanism and that glycol ethers, beside being an unusually efficient tunneling medium, behave identically to alkanes. We fabricated memory bits from crossbar junctions prepared by injecting eutectic Ga-In into microfluidic channels. Two 8-bit registers were able to perform logical AND operations on bit strings encoded into chemical packets as microfluidic droplets that alter the composition of the crossbar junctions through self-assembly to effect memristor-like properties. This proof of concept work demonstrates the potential for fieldable molecular-electronic devices based on tunneling junctions of self-assembled monolayers and bilayers.

Self-assembly of biomolecules at surfaces characterized by NEXAFS

2007 ◽  
Vol 85 (10) ◽  
pp. 793-800 ◽  
Author(s):  
Xiaosong Liu ◽  
Fan Zheng ◽  
A Jürgensen ◽  
V Perez-Dieste ◽  
D Y Petrovykh ◽  
...  
Keyword(s):  
Surface Science ◽  
Self Assembly ◽  
Ribonuclease A ◽  
Polarization Dependence ◽  
Biological Molecules ◽  
Self Assembled Monolayers ◽  
Peptide Bonds ◽  
Molecular Adsorbates ◽  
Dna Oligonucleotides ◽  
Assembled Monolayers

Surface science has made great strides towards tailoring surface properties via self-assembly of nanoscale molecular adsorbates. It is now possible to functionalize surfaces with complex biomolecules such as DNA and proteins. This brief overview shows how NEXAFS (near edge X-ray absorption fine structure spectroscopy) can be used to characterize the assembly of biological molecules at surfaces in atom- and orbital-specific fashion. To illustrate the range of applications, we begin with simple self-assembled monolayers (SAMs), proceed to SAMs with customized terminal groups, and finish with DNA oligonucleotides and Ribonuclease A, a small protein containing 124 amino acids. The N 1s absorption edge is particularly useful for characterizing DNA and proteins because it selectively interrogates the π* orbitals in nucleobases and the peptide bonds in proteins. Information about the orientation of molecular orbitals is obtained from the polarization dependence. Quantitative NEXAFS models explain the polarization dependence in terms of molecular orientation and structure.Key words: NEXAFS, bio-interfaces, ribonuclease A, immobilization, orientation.

Coating a DNA self-assembled monolayer with a metal organic framework-based exoskeleton for improved sensing performance

The Analyst ◽  
2019 ◽  
Vol 144 (11) ◽  
pp. 3539-3545 ◽  
Author(s):  
Jiehua Ma ◽  
Wenxin Chai ◽  
Jianyang Lu ◽  
Tian Tian ◽  
Shuai Wu ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Self Assembled Monolayers ◽  
Self Assembled Monolayer ◽  
New Strategy ◽  
Assembled Monolayers ◽  
Metal Organic ◽  
Self Assembled ◽  
Poor Stability ◽  
Sensing Performance ◽  
Organic Framework

The relatively poor stability of DNA self-assembled monolayers (SAMs) greatly limits their use in real applications. A new strategy is reported to protect the DNA SAMs by using a metal organic framework (MOF)-based exoskeleton.

Synthesis of Calixarene Derivatives in One Reaction System

2014 ◽  
Vol 1015 ◽  
pp. 594-597
Author(s):  
Bing Qing Cao ◽  
Qi Bin Huang ◽  
Yong Pan ◽  
Mo Lin Qin
Keyword(s):  
Self Assembly ◽  
Delay Line ◽  
Organophosphorus Compounds ◽  
Reaction System ◽  
Reference Value ◽  
Self Assembled Monolayers ◽  
Sensitive Film ◽  
Assembled Monolayers ◽  
Ft Ir ◽  
Substitute Reaction

This paper presents a effective approach for one new supermolecule function materia preparation, 25-(thioalkyl-alkoxy)-p-tertbutylcalix [4] arene with self-assembled monolayers character was synthesized by two-step nucleophilic substitute reaction in NaH-THF phase with p-tertbutylcalix [4] arene and dibromodecne . The structure of product was characterized by FT-IR, 1H NMR, 13C NMR and MALDI-TOF-MS. The self-assembly molecular imprinted film as the sensitive film was coated on the gold delay line of SAW sensors to detect for detecting organophosphorus compounds such as sarin, had important reference value in counter-terrorism.

scholarly journals Surface assembly and nanofabrication of 1,1,1-tris(mercaptomethyl)heptadecane on Au(111) studied with time-lapse atomic force microscopy

2014 ◽  
Vol 5 ◽  
pp. 26-35 ◽  
Author(s):  
Tian Tian ◽  
Burapol Singhana ◽  
Lauren E Englade-Franklin ◽  
Xianglin Zhai ◽  
T Randall Lee ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Self Assembly ◽  
Time Lapse ◽  
Scanning Probe ◽  
Self Assembled Monolayers ◽  
Force Microscopy ◽  
Atomic Force ◽  
Surface Assembly ◽  
Assembled Monolayers ◽  
Liquid Cell

The solution self-assembly of multidentate organothiols onto Au(111) was studied in situ using scanning probe nanolithography and time-lapse atomic force microscopy (AFM). Self-assembled monolayers (SAMs) prepared from dilute solutions of multidentate thiols were found to assemble slowly, requiring more than six hours to generate films. A clean gold substrate was first imaged in ethanolic media using liquid AFM. Next, a 0.01 mM solution of multidentate thiol was injected into the liquid cell. As time progressed, molecular-level details of the surface changes at different time intervals were captured by successive AFM images. Scanning probe based nanofabrication was accomplished using protocols of nanografting and nanoshaving with n-alkanethiols and a tridentate molecule, 1,1,1-tris(mercaptomethyl)heptadecane (TMMH). Nanografted patterns of TMMH could be inscribed within n-alkanethiol SAMs; however, the molecular packing of the nanopatterns was less homogeneous compared to nanopatterns produced with monothiolates. The multidentate molecules have a more complex assembly pathway than monothiol counterparts, mediated by sequential steps of forming S–Au bonds to the substrate.

scholarly journals Development of an Enzyme-Coated Microcantilever-Based Biosensor for Specific Detection of Short-Chain Alcohols

2021 ◽  
Vol 6 (1) ◽  
pp. 75
Author(s):  
Alexandre Margarido ◽  
Livia Regina Manzine ◽  
Fernando M. Araujo-Moreira ◽  
Renato Vitalino Gonçalves ◽  
Paulo Sergio de Paula Herrmann
Keyword(s):  
Photoelectron Spectroscopy ◽  
Self Assembly ◽  
Short Chain ◽  
Self Assembled Monolayers ◽  
Specific Detection ◽  
Force Microscopy ◽  
Nonpolar Solvents ◽  
Atomic Force ◽  
Assembled Monolayers ◽  
Enzymatic Detection

This paper describes the development of a biosensor designed for the enzymatic detection of short-chain alcohols. The biorecognition element, alcohol dehydrogenase, was immobilized on self-assembled monolayers deposited on top of silicon nitride microcantilevers. The self-assembly process was performed by surface activation using 3-aminopropyltriethoxysilane, followed by glutaraldehyde and biomolecule binding. X-ray photoelectron spectroscopy and atomic force microscopy were used. The biosensor showed a lower response time and sensibility from 0.03 to 1.2 mL/L. Its selectivity was analyzed through exposure to pure and mixed volatile solvents. Sensor sensibility was higher in the presence of short-chain alcohols and practically null involving other polar or nonpolar solvents.

Synthesis of novel porphyrin and chlorin phosphonic acids and their immobilization on metal oxides

2011 ◽  
Vol 15 (09n10) ◽  
pp. 1070-1077 ◽  
Author(s):  
Martin Erbacher ◽  
Franz-Peter Montforts
Keyword(s):  
Metal Oxides ◽  
Phosphonic Acid ◽  
Self Assembled Monolayers ◽  
Phosphonic Acids ◽  
Amide Coupling ◽  
Vis Spectroscopy ◽  
Assembled Monolayers ◽  
Phosphonic Acid Groups ◽  
Hemin Chloride ◽  
Blood Pigment

In this study an easy and flexible access to porphyrin and chlorin phosphonic acids is presented. Novel types of phosphonic acid terminated porphyrins and chlorins were synthesized starting from commercially available red blood pigment hemin chloride. Phosphonic acid groups were linked to the porphyrinoids by amide coupling via appropriate spacer moieties. Self-assembled monolayers of the synthesized phosphonates on mesoporous TiO2 electrodes of approximately 3 μm thickness were formed. Surface concentrations in a range of 1 to 4 × 10-8 mol.cm-2 could be determined by UV-vis spectroscopy.

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