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The effect of multiple pairs of meta-dicarboxyl groups on molecular self-assembly and the selective adsorption of coronene by hydrogen bonding and van der Waals forces

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Nano Research 2022年第2期15卷 1691-1697页

作者： Jianqiao Li Wendi Luo Siqi Zhang Chunyu Ma Xunwen Xiao Wubiao Duan Qingdao Zeng CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology(NCNST)Beijing 100190China Department of Chemistry School of ScienceBeijing Jiaotong UniversityBeijing 100044China School of Materials and Chemical Engineering Ningbo University of TechnologyNingbo 315211China

The prediction of two-dimensional molecular self-assembly structures has always been a problem to be *** molecules with meta-dicarboxyl groups can self-assemble into a specific hexagonal cavity,which has an important influence on the prediction of molecular self-assembly structures and the application of functional molecules with meta-dicarboxyl *** kinds of molecules with four pairs of meta-dicarboxyl groups,1,3,6,8-tet「akis(3,5-isophthalic acid)pyrene(H_(8)TIAPy)and 4′,4′",4′"",4""-(ethene-1,1,2,2-tetrayl)tetrakis(([1,1′-biphenyl]-3,5-dicarboxylic acid))(H8ETTB)molecules were chosen to observe the self-assembly behavior at the heptanoic acid/highly oriented pyrolytic graphite(HA/HOPG)interface.H8TIAPy molecules self-assembled into well-ordered quadrilateral structures and could be regulated into kagome networks with hexagonal pores by coronene(COR)molecules.H8ETTB molecules self-assembled into lamellar structures and transformed into acid-COR-acid-COR co-assembled structures at low concentration of COR solution and acid-COR dimer-acid-COR dimer co-assembled structures at high concentration of COR *** reason that H8ETTB molecules could not be regulated into hexagonal porous architecture was attributed to the steric hindrance by the similar length and width of H8ETTB *** H8ETTB templates had stronger adsorption for COR than that of hexaphenylbenzene(HPB),regardless of the order of molecular introduction.

关键词： meta-dicarboxyl groups hexagonal cavity selective adsorption self-assembly steric hindrance

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Wavelength Conversion in Photonic Crystal cavity

Wavelength Conversion in Photonic Crystal Cavity

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作者： Md. Abu Jubair 南京理工大学

学位级别：硕士

Photonic crystals(PCs)are consist of periodicdielectric,metallicdielectricorevensuper conductormicrostructures omanostructureswhich have an affecton theelectromagnetic wavepr opagation by defining allowed and forbidden electronicenergy *** crystals contai n repeating regions of high and lowdielectric *** either propagate through this structure or not,depending on their *** bands ofwavelengthsare calledph otonicband *** cavity confines light at resonance frequencies and can therefore al so be referred as an optical *** resonators are characterized by two key parame ters reflecting their ability to confine the optical energy temporally and spatially:the formeris quantified by the quality factor Q and the latter by the modevolume *** is possible to dyna mically change the wavelength of photons captured in a cavity by rapidly changing the cavity's resonance *** process is called adiabatic wavelength *** the adiabat ic conversion process,the photon number does not change,and a certain amount of energy is directly given to or taken from each *** such asthin-film optics,low and hig h reflection coatings on lenses and mirrors tocolor changing paintsandinks,photonic-crystal fi bers,the three-dimensional counterparts are still far from commercialization but may offer ad ditional features such asoptical nonlinearityrequired for the operation of optical transistors us ed inoptical *** dissertation work aims at both developing highly nonlinear optical wavelength converter and demonstrating via cavity timing through different types of material(silicon,GaAs and Germanium).And covers illustration of three-dimensional woodpile photonic crystal and its band structure comparison,photonic crystal wavelength converter and its design,device characterization and system *** demonstrate that the wavelength conversion of light through the simple dynamic refractive index tu

关键词： photonic crystal band gap hexagonal cavity refractive indextuning wavelength conversion

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