SrTiO3 thin film was successfully prepared on the functionalized organic self-assembled monolayers（SAMs） by the Liquid Phase Deposition（LPD） method.The as-prepared samples were characterized by X-ray diffraction（...SrTiO3 thin film was successfully prepared on the functionalized organic self-assembled monolayers（SAMs） by the Liquid Phase Deposition（LPD） method.The as-prepared samples were characterized by X-ray diffraction（XRD）,atomic force microscope（AFM）,scanning electron microscopy（SEM） and metallographic microscope.Measurement of contact angle showed that the hydrophobe substrate was changed into hydrophile by UV irradiation.AFM photographs of octadecyl-trichloro-silane self-assembled monolayer（OTS-SAM） surface approved that UV irradiation did change the morphology of OTS monolayer and provided evidence for the conversion of hydrophilic characteristic.Photographs of Metallographic Microscope showed that OTS-SAM had an active effect on the deposition of SrTiO3 thin film.XRD and SEM indicated that the thin film was of pure cubic phase SrTiO3 and composed of nanosized grains with a size in the range of 100-500 nm.The formation mechanism of the SrTiO3 film was proposed.展开更多
This study investigated the stability behaviour of molecular monolayer symmetric chemically modified tetraether lipids caldarchaeol-PO<sub>4</sub> on the amino-silanised silicon wafer using Langmuir-Blodge...This study investigated the stability behaviour of molecular monolayer symmetric chemically modified tetraether lipids caldarchaeol-PO<sub>4</sub> on the amino-silanised silicon wafer using Langmuir-Blodgett films, Self Assembling Monolayers (SAMs), ellipsometry, and atomic force microscopy (AFM). The monolayers of caldarchaeol-PO<sub>4 </sub>were stable on the solid surface amino-silanised silicon wafer. The organizations of molecular monolayers caldarchaeol-PO<sub>4</sub> by Langmuir-Blodgett method and SAMs have been analyzed. The surface of pressure in Langmuir-Blodgett processing is carried out monolayers caldarchaeol-PO<sub>4</sub> more flat island inhomogeneous. Another method of monolayers caldarchaeol-PO<sub>4</sub> by SAMs is showed a large flat domain. Monolayers caldarchaeol-PO<sub>4</sub> by Langmuir-Blodgett method seems to be stable and chemically resistant after washing with organic solvent and an additional treatment ultrasonification with various thickness lipids arround 2 nm to 6 nm. Conversely, monolayer caldarchaeol-PO<sub>4</sub> by SAMs appears fewer than monolayers caldarchaeol-PO<sub>4</sub> by Langmuir-Blodgett method, the thickness of various from 1 nm to 3 nm.展开更多
Silane coupling reagent (3-aminopropyltriethoxysilane (APTES)) was prepared on single-crystal silicon substrates to form two-dimensional self-assembled monolayer (SAM). The terminal-NH2 groups in the film were in situ...Silane coupling reagent (3-aminopropyltriethoxysilane (APTES)) was prepared on single-crystal silicon substrates to form two-dimensional self-assembled monolayer (SAM). The terminal-NH2 groups in the film were in situ phosphorylated to -PO(OH)2 group to endow the film with good chemisorption ability. Then La-based thin films were deposited on phosphorylated APTES-SAM in order to make good use of the chemisorption ability of -PO(OH)2 groups. The thickness of the film was determined with ellipsometer, while phase transformation and surface morphology, surface energy, phase composition were analyzed by means of atomic force microscope (AFM), contact angle measurements and X-ray photoelectron spectroscopy (XPS). The results indicated that the terminal-NH2 groups could be completely transformed into desirable-PO(OH)2 groups after phosphorylation of APTES-SAM. Detailed XPS analysis of the La3+ peaks revealed that lanthanum element existed in the films in different states. As a result, conclusion could be made that lanthanum reacted with -PO(OH)2 groups on the surface of the substrate by chemical bond which would improve the bonding strength between the film and silicon substrate. Since the La-based thin films were well adhered to the silicon substrate, it might find promising application in the surface-modification of single-crystal Si and SiC in microelectromechanical systems (MEMS).展开更多
This study explores a strategy of using the phosphonic acid derivative （11-（（12-（anthracen-2- yl）dodecyl）oxy）-11-oxoundecyl） phosphonic acid （ADO-phosphonic acid） as self-assembled monolayers （SAMs） on a S...This study explores a strategy of using the phosphonic acid derivative （11-（（12-（anthracen-2- yl）dodecyl）oxy）-11-oxoundecyl） phosphonic acid （ADO-phosphonic acid） as self-assembled monolayers （SAMs） on a Si/SiO2 surface to induce the crystallization ofrubrene in vacuum deposited thin film transistors, which showed a field-effect mobility as high as 0.18 cm2/（V.s）. It is found that ADO-phosphonic acid SAMs play a unique role in modulating the morphology ofrubrene to form a crystalline film in the thin-film transistors.展开更多
研究了一种合成三(乙烯醇)单-11-十一烷基硫醇的新方法,即以三乙二醇和1,11-二溴十一烷为底物,经过去质子化、取代、水解3步反应得到目标化合物三(乙烯醇)单-11-十一烷基硫醇。目标产物的总收率为16.5%,其结构经1 H NMR确证。考察了氢...研究了一种合成三(乙烯醇)单-11-十一烷基硫醇的新方法,即以三乙二醇和1,11-二溴十一烷为底物,经过去质子化、取代、水解3步反应得到目标化合物三(乙烯醇)单-11-十一烷基硫醇。目标产物的总收率为16.5%,其结构经1 H NMR确证。考察了氢化钠用量和水解反应催化剂对产物收率的影响。结果表明,当n(三乙二醇)∶n(氢化钠)=1.00∶1.00时,水解反应催化剂选用浓氨水时,3步反应的收率较高。方法副产物少,污染小,操作简单,适合小批量生产。展开更多
Self-healing materials have been developed over the past decade with the recovery ability after damage.However,most researches focused on the self-healing process at three-dimension.Herein,we prepare monolayer self-he...Self-healing materials have been developed over the past decade with the recovery ability after damage.However,most researches focused on the self-healing process at three-dimension.Herein,we prepare monolayer self-healing hydrogen-bond-based supramolecular polymer film and explore the self-healing process at the two-dimensional limit.The healing process,which can be reversibly repeated for at least three times,is influenced by the temperature,the molecule-substrate interaction and the substrate roughness.In the application,the monolayer self-healing polymer film can be used to modify the SiO2 dielectric for copper phthalocyanine field effect transistor with improved mobility.This work will be valuable for developing two-dimensional functional self-healing materials in the future.展开更多
基金Funded by National Natural Science Foundation of China (No. 50672055,50872077)National Key Technology R&D Program (No. 2006BAF02A28)the Graduate Innovation Fund of Shaanxi University of Science and Technology
文摘SrTiO3 thin film was successfully prepared on the functionalized organic self-assembled monolayers（SAMs） by the Liquid Phase Deposition（LPD） method.The as-prepared samples were characterized by X-ray diffraction（XRD）,atomic force microscope（AFM）,scanning electron microscopy（SEM） and metallographic microscope.Measurement of contact angle showed that the hydrophobe substrate was changed into hydrophile by UV irradiation.AFM photographs of octadecyl-trichloro-silane self-assembled monolayer（OTS-SAM） surface approved that UV irradiation did change the morphology of OTS monolayer and provided evidence for the conversion of hydrophilic characteristic.Photographs of Metallographic Microscope showed that OTS-SAM had an active effect on the deposition of SrTiO3 thin film.XRD and SEM indicated that the thin film was of pure cubic phase SrTiO3 and composed of nanosized grains with a size in the range of 100-500 nm.The formation mechanism of the SrTiO3 film was proposed.
文摘This study investigated the stability behaviour of molecular monolayer symmetric chemically modified tetraether lipids caldarchaeol-PO<sub>4</sub> on the amino-silanised silicon wafer using Langmuir-Blodgett films, Self Assembling Monolayers (SAMs), ellipsometry, and atomic force microscopy (AFM). The monolayers of caldarchaeol-PO<sub>4 </sub>were stable on the solid surface amino-silanised silicon wafer. The organizations of molecular monolayers caldarchaeol-PO<sub>4</sub> by Langmuir-Blodgett method and SAMs have been analyzed. The surface of pressure in Langmuir-Blodgett processing is carried out monolayers caldarchaeol-PO<sub>4</sub> more flat island inhomogeneous. Another method of monolayers caldarchaeol-PO<sub>4</sub> by SAMs is showed a large flat domain. Monolayers caldarchaeol-PO<sub>4</sub> by Langmuir-Blodgett method seems to be stable and chemically resistant after washing with organic solvent and an additional treatment ultrasonification with various thickness lipids arround 2 nm to 6 nm. Conversely, monolayer caldarchaeol-PO<sub>4</sub> by SAMs appears fewer than monolayers caldarchaeol-PO<sub>4</sub> by Langmuir-Blodgett method, the thickness of various from 1 nm to 3 nm.
基金Project supported by the National Natural Science Foundation of China (50475023)
文摘Silane coupling reagent (3-aminopropyltriethoxysilane (APTES)) was prepared on single-crystal silicon substrates to form two-dimensional self-assembled monolayer (SAM). The terminal-NH2 groups in the film were in situ phosphorylated to -PO(OH)2 group to endow the film with good chemisorption ability. Then La-based thin films were deposited on phosphorylated APTES-SAM in order to make good use of the chemisorption ability of -PO(OH)2 groups. The thickness of the film was determined with ellipsometer, while phase transformation and surface morphology, surface energy, phase composition were analyzed by means of atomic force microscope (AFM), contact angle measurements and X-ray photoelectron spectroscopy (XPS). The results indicated that the terminal-NH2 groups could be completely transformed into desirable-PO(OH)2 groups after phosphorylation of APTES-SAM. Detailed XPS analysis of the La3+ peaks revealed that lanthanum element existed in the films in different states. As a result, conclusion could be made that lanthanum reacted with -PO(OH)2 groups on the surface of the substrate by chemical bond which would improve the bonding strength between the film and silicon substrate. Since the La-based thin films were well adhered to the silicon substrate, it might find promising application in the surface-modification of single-crystal Si and SiC in microelectromechanical systems (MEMS).
基金Project supported by the National Natural Science Foundation of China(No.61106002)the Natural Science Foundation Project of CQCSTC(No.2011BB4083)the Fundamental Research Funds for the Central Universities(Nos.CDJZR13225502,CQDXWL-2012-030,CDJRC10220007)
文摘This study explores a strategy of using the phosphonic acid derivative （11-（（12-（anthracen-2- yl）dodecyl）oxy）-11-oxoundecyl） phosphonic acid （ADO-phosphonic acid） as self-assembled monolayers （SAMs） on a Si/SiO2 surface to induce the crystallization ofrubrene in vacuum deposited thin film transistors, which showed a field-effect mobility as high as 0.18 cm2/（V.s）. It is found that ADO-phosphonic acid SAMs play a unique role in modulating the morphology ofrubrene to form a crystalline film in the thin-film transistors.
文摘研究了一种合成三(乙烯醇)单-11-十一烷基硫醇的新方法,即以三乙二醇和1,11-二溴十一烷为底物,经过去质子化、取代、水解3步反应得到目标化合物三(乙烯醇)单-11-十一烷基硫醇。目标产物的总收率为16.5%,其结构经1 H NMR确证。考察了氢化钠用量和水解反应催化剂对产物收率的影响。结果表明,当n(三乙二醇)∶n(氢化钠)=1.00∶1.00时,水解反应催化剂选用浓氨水时,3步反应的收率较高。方法副产物少,污染小,操作简单,适合小批量生产。
基金supported by National Program for Thousand Young Talents of China,the National Natural Science Foundation of China(Nos.51773041,21544001,21603038)Shanghai Committee of Science and Technology in China(No.18ZR1404900)Fudan University
文摘Self-healing materials have been developed over the past decade with the recovery ability after damage.However,most researches focused on the self-healing process at three-dimension.Herein,we prepare monolayer self-healing hydrogen-bond-based supramolecular polymer film and explore the self-healing process at the two-dimensional limit.The healing process,which can be reversibly repeated for at least three times,is influenced by the temperature,the molecule-substrate interaction and the substrate roughness.In the application,the monolayer self-healing polymer film can be used to modify the SiO2 dielectric for copper phthalocyanine field effect transistor with improved mobility.This work will be valuable for developing two-dimensional functional self-healing materials in the future.
