We study surface plasmon polaritons excited on two-dimensional three-order dendritic structures. Previous studies show that split ring resonators （SRRs） can be used to obtain magnetic resonance, thus sustairdng surf...We study surface plasmon polaritons excited on two-dimensional three-order dendritic structures. Previous studies show that split ring resonators （SRRs） can be used to obtain magnetic resonance, thus sustairdng surface waves behaving like surface plasmon polaritons （SPPs）. In this paper, we obtain detailed results on surface plasmon polaritons of several different grating structures and theoretically prove that this kind of structures can sustain SPPs. Besides, since dendritic structures can be fabricated by double template-assisted electrochemical deposition, it is worth noting that fabrication of SPP-based materials might be much easier.展开更多
Via a galvanic displacement reaction, well-defined micro/nano binary dendritic gold structures were prepared on silicon wafers in fluoride acid solution containing HAuCI4 at 50 ℃. The gold deposits were characterized...Via a galvanic displacement reaction, well-defined micro/nano binary dendritic gold structures were prepared on silicon wafers in fluoride acid solution containing HAuCI4 at 50 ℃. The gold deposits were characterized with scanning electron microscopy （SEM）, energy-dispersive X-ray （EDX） spectrum and X-ray diffraction （XRD）. The investigation of the surface-enhanced Raman scattering （SERS） reveals that the film of gold dendrites was an excellent substrate with significant enhancement effect. Also, the gold dendritic structured surface exhibited a remarkable superhydrophobic property with a contact angle of approximately 165° and low contact angle hysteresis after further simple surface modification with n-dodecanethiol.展开更多
We previously demonstrated that polypod-like structured DNA, or polypodna, constructed with three or more oligodeoxynucleotides （ODNs）, is efficiently taken up by immune cells such as dendritic cells and macrophages...We previously demonstrated that polypod-like structured DNA, or polypodna, constructed with three or more oligodeoxynucleotides （ODNs）, is efficiently taken up by immune cells such as dendritic cells and macrophages, depending on its structural complexity. The ODNs comprising the polypodna should bend to form the polypod-like structure, and may do so by adopting either a bend- type conformation or a cross-type conformation. Here, we tried to elucidate the orientation and bending of ODNs in polypodnas using atomic force microscopy （AFM）. We designed two types of pentapodnas （i.e., a polypodna with five pods） using 60- to 88-base ODNs, which were then immobilized on DNA origami frames. AFM imaging showed that the ODNs in the pentapodna adopted bend-type conformations. Tetrapodna and hexapodna also adopted bend-type conformations when they were immobilized on frames under unconstrained conditions. These findings provide useful information toward the coherent design of, and the structure-activity relationships for, a variety of DNA nanostructures.展开更多
Inorganic nanomaterials have a variety of fascinating properties and a wide range of promising applications.However,they often suffer from instability and poor processibility.To solve it,dendrimers,a special family of...Inorganic nanomaterials have a variety of fascinating properties and a wide range of promising applications.However,they often suffer from instability and poor processibility.To solve it,dendrimers,a special family of macromolecules having a unique three-dimensional architecture,provide one of the excellent solutions.In addition,the site-selective functionalization of the specific elements in the dendritic structure endows the nanohybrid system new functions and applications.Inspired by such ideas,a variety of dendrimer/inorganic nanomaterial composites have been designed and exploited.This review article selects a number of representative examples,and illustrates their preparation,characterization,properties,and applications.The influence and the unique features that originate from the introduced dendritic structures are particularly discussed.展开更多
基金Supported by the National Natural Science Foundation of China under Grants Nos. 10974030 and 10574027
文摘We study surface plasmon polaritons excited on two-dimensional three-order dendritic structures. Previous studies show that split ring resonators （SRRs） can be used to obtain magnetic resonance, thus sustairdng surface waves behaving like surface plasmon polaritons （SPPs）. In this paper, we obtain detailed results on surface plasmon polaritons of several different grating structures and theoretically prove that this kind of structures can sustain SPPs. Besides, since dendritic structures can be fabricated by double template-assisted electrochemical deposition, it is worth noting that fabrication of SPP-based materials might be much easier.
文摘Via a galvanic displacement reaction, well-defined micro/nano binary dendritic gold structures were prepared on silicon wafers in fluoride acid solution containing HAuCI4 at 50 ℃. The gold deposits were characterized with scanning electron microscopy （SEM）, energy-dispersive X-ray （EDX） spectrum and X-ray diffraction （XRD）. The investigation of the surface-enhanced Raman scattering （SERS） reveals that the film of gold dendrites was an excellent substrate with significant enhancement effect. Also, the gold dendritic structured surface exhibited a remarkable superhydrophobic property with a contact angle of approximately 165° and low contact angle hysteresis after further simple surface modification with n-dodecanethiol.
文摘We previously demonstrated that polypod-like structured DNA, or polypodna, constructed with three or more oligodeoxynucleotides （ODNs）, is efficiently taken up by immune cells such as dendritic cells and macrophages, depending on its structural complexity. The ODNs comprising the polypodna should bend to form the polypod-like structure, and may do so by adopting either a bend- type conformation or a cross-type conformation. Here, we tried to elucidate the orientation and bending of ODNs in polypodnas using atomic force microscopy （AFM）. We designed two types of pentapodnas （i.e., a polypodna with five pods） using 60- to 88-base ODNs, which were then immobilized on DNA origami frames. AFM imaging showed that the ODNs in the pentapodna adopted bend-type conformations. Tetrapodna and hexapodna also adopted bend-type conformations when they were immobilized on frames under unconstrained conditions. These findings provide useful information toward the coherent design of, and the structure-activity relationships for, a variety of DNA nanostructures.
基金supported by the National Natural Science Foundation of China (20974119,90922019,and 21074147)Chinese Academy of Sciences,and the Science and Technology Commission of Shanghai Municipality (09PJ1411700)
文摘Inorganic nanomaterials have a variety of fascinating properties and a wide range of promising applications.However,they often suffer from instability and poor processibility.To solve it,dendrimers,a special family of macromolecules having a unique three-dimensional architecture,provide one of the excellent solutions.In addition,the site-selective functionalization of the specific elements in the dendritic structure endows the nanohybrid system new functions and applications.Inspired by such ideas,a variety of dendrimer/inorganic nanomaterial composites have been designed and exploited.This review article selects a number of representative examples,and illustrates their preparation,characterization,properties,and applications.The influence and the unique features that originate from the introduced dendritic structures are particularly discussed.
