A5091005249- Molecular Junctions and Nanostructures
- Quantum and electron transport phenomena
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Organic Electronics and Photovoltaics
- Nanowire Synthesis and Applications
- Force Microscopy Techniques and Applications
- Graphene research and applications
- Advanced biosensing and bioanalysis techniques
- Electrochemical Analysis and Applications
- Conducting polymers and applications
- Quantum-Dot Cellular Automata
- Advanced Memory and Neural Computing
- Quantum Dots Synthesis And Properties
- Semiconductor materials and devices
- Surface Chemistry and Catalysis
- Advanced Sensor and Energy Harvesting Materials
- Crystallography and molecular interactions
- 2D Materials and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Advancements in Battery Materials
- Gold and Silver Nanoparticles Synthesis and Applications
- Machine Learning in Materials Science
- Congenital Heart Disease Studies
- Supercapacitor Materials and Fabrication
Collaborative Innovation Center of Chemistry for Energy Materials
2016-2025
Xiamen University
2016-2025
Tan Kah Kee Innovation Laboratory
2020-2024
Nanyang Normal University
2024
Shanghai Children's Medical Center
2010-2024
Shanghai Jiao Tong University
2021-2024
China Mobile (China)
2024
Southern University of Science and Technology
2022-2023
Institute of Art
2022
University of Benin
2022
Complexation of cationic 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin (TMPyP) and negatively charged chemically converted graphene (CCG) sheets was performed by simply mixing the diluted aqueous solutions both components. During this process, a large bathochromic shift porphyrin Soret band from 421 to 458 nm observed, which is attributed flattening TMPyP molecules induced CCG through electrostatic π−π stacking cooperative interactions. Furthermore, coordination reaction between Cd2+...
Employing a scanning tunneling microscopy based beak junction technique and mechanically controlled break experiments, we investigated tolane (diphenylacetylene)-type single molecular junctions having four different anchoring groups (SH, pyridyl (PY), NH(2), CN) at solid/liquid interface. The combination of current-distance current-voltage measurements their quantitative statistical analysis revealed the following sequence for formation probability stability: PY > SH NH(2) CN. For all...
Positively charged gold nanoparticles (GNPs) with diameters of 2−6 nm were self-assembled onto the surfaces 1-pyrene butyric acid functionalized graphene (PFG) sheets simply by mixing their aqueous dispersions. The amount GNPs assembled on PFG can be easily modulated controlling feeding weight ratio both components. Furthermore, it was found that had a high loading capability GNPs, and maximum value determined to about 300 times PFG’s own weight. Glassy carbon (GC) electrodes modified...
The charge transport characteristics of 11 tailor-made dithiol-terminated oligo(phenylene-ethynylene) (OPE)-type molecules attached to two gold electrodes were studied at a solid/liquid interface in combined approach using an STM break junction (STM-BJ) and mechanically controlled (MCBJ) setup. We designed characterized structurally distinct OPE-type with varied length HOMO/LUMO energy. Increase the molecular and/or HOMO-LUMO gap leads decrease single-junction conductance linearly conjugate...
We report a combined experimental and theoretical investigation of the length dependence anchor group electrical conductance series oligoyne molecular wires in single-molecule junctions with gold contacts. Experimentally, we focus on synthesis properties diaryloligoynes n = 1, 2, 4 triple bonds dihydrobenzo[b]thiophene (BT). For comparison, also explored aurophilic cyano (CN), amino (NH2), thiol (SH), 4-pyridyl (PY). Scanning tunneling microscopy break junction (STM-BJ) mechanically...
Oriented external electric fields (OEEFs) offer a unique chance to tune catalytic selectivity by orienting the alignment of field along axis activated bond for specific chemical reaction; however, they remain key experimental challenge. Here, we experimentally and theoretically investigated OEEF-induced selective catalysis in two-step cascade reaction Diels-Alder addition followed an aromatization process. Characterized mechanically controllable break junction (MCBJ) technique nanogap...
A quantum circuit rule for combining interference effects in the conductive properties of oligo(phenyleneethynylene) (OPE)-type molecules possessing three aromatic rings was investigated both experimentally and theoretically. Molecules were type X-Y-X, where X represents pyridyl anchors with para (p), meta (m) or ortho (o) connectivities Y a phenyl ring p m connectivities. The conductances GXmX (GXpX) form X-m-X (X-p-X), (para) connections central ring, predominantly lower (higher),...
We apply direct ink writing for the three-dimensional (3D) printing of polyaniline/reduced graphene oxide (PANI/RGO) composites with PANI/graphene (PANI/GO) gel as printable inks. The PANI/GO inks 3D are prepared via self-assembly PANI and GO in a blend solvent N-methyl-2-pyrrolidinone water, offer both shaping capability, self-sustainability, electrical conductivity after reduction GO. PANI/RGO interdigital electrodes fabricated printing, based on these electrodes, planar solid-state...
ConspectusQuantum interference effects (QIEs), which offer unique opportunities for the fine-tuning of charge transport through molecular building blocks by constructive or destructive quantum interference, have become an emerging area in single-molecule electronics. Benefiting from QIEs, systems can be controlled minor structural and environmental variations, cause various states to significantly changed conductive insulative promising applications future functional devices. Although QIEs...
A new and efficient approach using cleaving of trimethylsilyl groups to create covalent Au–C anchoring sites has been developed for single-molecule junction conductance measurements. Employing the mechanically controllable break (MCBJ) technique in liquid, we demonstrate formation highly conducting single molecular junctions several OPE derivatives. The created are stable exhibit conductances around one order magnitude higher than those their dithiol analogues. Extended assembly reaction...
π-Conjugation plays an important role in charge transport through single molecular junctions. We describe this paper the construction of a mechanically controlled break-junction setup (MCBJ) equipped with highly sensitive log I–V converter order to measure ultralow conductances rods trapped between two gold leads. The current resolution reaches down 10 fA. report single-molecule conductance measurements anthracene-based linearly conjugated molecule ( AC ), anthraquinone-based...
The conductance properties of a photoswitchable dimethyldihydropyrene (DHP) derivative have been investigated for the first time in single-molecule junctions using mechanically controllable break junction technique. We demonstrate that reversible structure changes induced by isomerization single bispyridine-substituted DHP molecule are correlated with large drop value. found very high ON/OFF ratio (>10(4)) and an excellent reversibility switching.
Abstract To guide the choice of future synthetic targets for single‐molecule electronics, qualitative design rules are needed, which describe effect modifying chemical structure. Here heteroatom substitution on destructive quantum interference (QI) in junctions is, first time experimentally addressed by investigating conductance change when a “parent” meta‐phenylene ethylene‐type oligomer (m‐OPE) is modified to yield “daughter” inserting one nitrogen atom into m‐OPE core. We find that if...
The synthesis is reported of a new series oligo(aryleneethynylene) (OAE) derivatives up to ca. 6 nm in molecular length (OAE9) using iterative Pd-mediated Sonogashira cross-coupling methodology. oligo-p-phenyleneethynylene cores the wires are functionalized at both termini with pyridyl units for attachment gold leads. structures determined by single-crystal X-ray analysis OAE4, OAE5, OAE7, and OAE8a. charge transport characteristics OAE3–OAE9 single-molecular junctions have been studied...
Controlling charge transport through a single molecule connected to metallic electrodes remains one of the most fundamental challenges nanoelectronics. Here we use electrochemical gating reversibly tune conductance two different organic molecules, both containing anthraquinone (AQ) centers, over >1 order magnitude. For electrode potentials outside redox-active region, effect gate is simply shift molecular energy levels relative metal Fermi level. At redox potential, changes abruptly as AQ...
The understanding of the charge transport through single molecule junctions is a prerequisite for design and building electronic circuits based on junctions. However, reliable robust formation such challenging task to achieve. In this topical review, we present systematic investigation anchoring group effect junction conductance by employing two complementary techniques, namely scanning tunneling microscopy break (STM-BJ) mechanically controllable (MCBJ) studies published in literature...
Abstract Charge transport by tunnelling is one of the most ubiquitous elementary processes in nature. Small structural changes a molecular junction can lead to significant difference single-molecule electronic properties, offering tremendous opportunity examine reaction on scale monitoring conductance changes. Here, we explore potential break technique detection photo-thermal photochromic dihydroazulene/vinylheptafulvene system. Statistical analysis experiments provides quantitative approach...
Electrochemical methods are combined with shell-isolated nanoparticle-enhanced Raman spectroscopy (EC-SHINERS) for a comprehensive study of pyridine adsorption on Au(111), Au(100) and Au(110) single crystal electrode surfaces. The effects crystallographic orientation, concentration, applied potential elucidated, the formation second adlayer Au(111) is observed spectroscopically first time. SHINERS results correlate extremely well throughout this study, we demonstrate EC-SHINERS thorough...
Molecular assembly is crucial in functional molecular materials and devices. Among the interactions that can form assemblies, stacking among π-conjugated backbones plays an essential role charge transport through organic The single-molecule junction technique allows for application of electric field approximately 108 V/m to nanoscale junctions investigate field-induced at single-stacking level. Here, we demonstrate effect between two molecules using scanning tunneling microscope break...