Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 35
·14481-14492
·
IF 0
Ren Liu,Xuebiao Zeng,Jingcheng Liu,Yuanyi Zheng,Jing Luo,Xiaoya Liu
Noncovalent surface modification has been proved to be one of the effective strategies for enhancing the properties of multi-walled carbon nanotubes (MWCNTs). When a non-covalent modification method is appropriately designed, novel opportunities for better performance of CNTs can be expected. In this paper, a novel kind of branched amphiphilic photo-sensitive and electro-active copolymer (BP(VCz/VM-alt-MA); BPVCM) was synthesized through a simple one-pot free radical copolymerization with 7-(4-vinylbenzyloxy)-4-methyl coumarin (VM), maleic anhydride (MA), 4-vinylbenzyl thiol (VBT) and 9-(4-vinylbenzyl)-9H-carbazole (VCz) as monomers. The copolymer BPVCM can self-assemble into homogeneous spherical micelles along the side-walls of MWCNTs and efficiently disperse MWCNTs in aqueous solution. In addition, the photosensitive coumarin groups of the copolymer chain undergo crosslinking under UV-irradiation, which leads to the encapsulation of MWCNTs in the crosslinked micelles and greatly improves the stability of the obtained MWCNT suspension. More interestingly, the electroactive carbazole moieties of the BPVCM–MWCNT composites could polymerize via an electrochemical polymerization method and form a MWCNT based conducting coating on the modified glassy carbon electrode (GCE), which eventually increases the number of electroactive sites and significantly accelerates the electron transfer. This novel preparation method permits us to obtain carbon nanotube hybrids exhibiting high water-dispersibility and stability while preserving their outstanding electrical properties, and would be valuable for construction of microelectronics and electrochemical sensors.
研究领域:
材料科学
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纳米技术
·
化学工程
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shan Huang,Xialei Lv,Xingwang Lai,Jinhui Li,Yao Zhang,Siyao Qiu,Guoping Zhang,Rong Sun
Low-temperature curable photosensitive polyimide (PSPI) materials have attracted widespread attention in advanced packaging, serving as key insulating dielectric materials in redistribution layer (RDL) to avoid wafer warpage. Considering PSPI and copper together formed the core RDL part, the adhesion between PI and copper need to be concerned to realize high reliability. However, the exploration of novel diamines with desirable characteristics such as low temperature curing ability, improved adhesion and excellent lithography properties was limited. We designed a new diamine with fluorine-containing pyridine side group named PyFNH 2 , which facilitated preparation of low-temperature curable polyimide (at 200 °C) with remarkable degree of imidization (≥95.9 %). Secondly, the coordination interaction between pyridine side group and copper enhanced adhesion strength. Thirdly, the PI films cured at 200 °C exhibited favorable dielectric properties compared to control films without PyFNH 2 , because of the introduction of electronegative fluorine atoms and rigid side groups. Apart of these, the PI films possessed fairly good thermal and mechanical properties. Significantly, negative-tone PSPI employing the precursor poly (amic ester) with PyFNH 2 was successfully prepared and cured at 200 °C, enabling precise lithography patterns with line resolutions down to 3 µm. Our findings highlight promising application potential of PyFNH 2 in photolithography technology, offering a feasible strategy for structure designs of low-temperature curable diamine.
研究领域:
材料科学
·
微电子技术
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Hanlin Du,Yueting Deng,Xingyu Hu,Juan Peng,Huan Hu,Yun Tang,Xu Ye,Jajun Ma,Junxiao Yang
Low dielectric photoinduced patterned materials have attracted extensive attention owing to their potential applications in integrated circuits and semiconductor devices. In this work, we synthesized a low dielectric polymer that can be used for photolithography. The monomer, 1-(4-vinylphenyl)-2-(4-benzocyclobutenyl)ethene (DVB-S-BCB), was synthesized from divinylbenzene (DVB) and 4-bromobenzocyclobutene (4-BrBCB) using the Heck reaction. Subsequently, P-DVB based on DVB-S-BCB was prepared by anionic polymerization . As the structure comprised thermally curable benzocyclobutene (BCB) groups and photocurable vinyl groups (UV/Thermal dual curing structure), P-DVB has been used for high-performance negative photosensitive resin with 2,6-bis(4-azidobenzylidene) cyclohexanone (BAC) as a photoinitiator. Photolithography was carried out using a 365-nm UV light source to obtain various patterns, and the research results indicate that photosensitive resins exhibit stable patterning processes at different curing stages. Besides, the cured P-DVB exhibited high thermal stability (T 5% above 420 °C in N 2 ), low dielectric constant (2.55 at 10 MHz), low dielectric loss (1.56 × 10 −3 at 10 MHz), and excellent mechanical performance. These properties make P-DVB a potential photoresist that can be widely used as interconnected dielectrics.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2019
·
IF 0
Yan Kai Huang,Qi Lin Mei,Zhi Xiong Huang,Yan Qin,Di Zhu
In this paper, the structure of the photosensitive diamines was designed and the method of synthesizing such diamines was investigated. The 1-(3-aminophenyl)-3-(4-aminophenyl)-2-propen-1-one analyzed by elemental analysis and infrared analysis was synthesized through two-step experiments with Aldol condensation and Nitroammoniation process. Through the experiment the optimum reaction conditions are raw material ratio of 1:1, anhydrous ethanol dosage of 60 ml, 10 % NaOH dosage of 10 ml and reaction temperature of 25°C for 4h. The yield was about 55.4 %.
研究领域:
有机化学
·
材料科学
✓ 已验证
产品关联
DOI
RSC Advances
·
2013
·Vol. 3
·期 36
·15909-15916
·
IF 2.562
Yizhong Huang,Hongliang Kang,Guanghua Li,Chunying Wang,Yong Huang,Ruigang Liu
Azobenzene functionalized hydroxypropyl cellulose derivatives (azo-HPCs) with different degrees of substitution with azobenzene moieties were synthesized and characterized. The degree of substitution with the azobenzene moieties (DSazo) can be adjusted by changing the feed ratio in the reaction mixture. The photosensitivity of the azo-HPCs in both solution and solution film was investigated. The azobenzene moieties of the azo-HPCs exhibited a reversible cis-to-trans isomerization transition upon irradiation with UV and visible light in both solution and the solid state. The reversible trans-to-cis photoisomerization led to a change of the wettability of the azo-HPC films. Surface energy estimations suggest that the tunable film wettability was attributed to the change of the dipole moment of the azobenzene moieties in the film surface. The variation of the contact angle depends on the DSazo of the azo-HPC derivatives. A higher DSazo corresponds to a larger variation of water contact angle upon UV irradiation under the same conditions. This work offers a versatile method to manipulate the surface properties of the eco-friendly cellulose derivatives.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Zhixia Gong,Tiaozhen Yu,Zhi Cai,Ying Yi,Jingli Zhang,Weiquan Cai,Yihua Yin,Guanghua He,Yaqi Xiao,Peiyu Xu,Huiyi Wu,Sihui Lin
Photoactivated pesticides with high activity, environmental friendliness, and no drug resistance represent the direction of pesticide development. However, poor photostability and lack of targeting ability greatly restrict their practical application. Herein, a novel amphiphilic photoactivated polymeric propesticide was synthesized by conjugation of mPEG with the photo/enzyme-labile o-nitrobenzyl ester group followed by grafting protoporphyrin IX (PpIX), which could self-assemble into photo/esterase responsive polymer micelles in aqueous solutions for a controlled release of PpIX. The fluorescence quenching caused by the aggregation of PpIX into hydrophobic core could enhance its photostability. UV/esterase stimulation could trigger the release of PpIX and restore its photodynamic activity. Compared to a single stimulus, dual stimulation could trigger more PpIX release and resulting in higher photodynamic activity and antibacterial effect. In addition, light exposure also showed little influence on the photodynamic activity and antibacterial effect of the system due to enhanced photostability. Compared with PpIX, the nanosystem exhibited higher wettability and retention ability on plant leaves and could resist rainwater washout. Weed control experiment also demonstrated that the system’s control effect on barnyard grass. Therefore, this study provides new ideas for promoting the application of photoactivated pesticides in the field of plant protection.
研究领域:
植物保护
·
农药科学
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产品关联
DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Xiaoyu Lan,Xiaofeng Ma,Lei Wang,Yijun Shi,Qun Gu,Linlin Wu,Xiaoli Gu,Zhenyang Luo
This work prepared a type of diblock copolymer with thermo- and photosensitivity in ionic liquids (ILs). P(N,N-dimethylacrylamide) (compatible with ILs) was prepared as one segment, while butyl acrylate (BA) and 4-phenylazophenylmethacrylate (AzoMA) were copolymerized as another segment P(AzoMA-r-BA) with stimuli responsiveness. The diblock copolymer showed tunable lower critical micellization temperature (LCMT) in two mixed imidazole ionic liquids. The value of LCMT depends on not only the conformation status of the azo group in copolymers but also the azo group content in copolymers and mixed ratio of ionic liquids. Based on this tunable LCMT, photoinduced micellization/demicellization can be achieved near room temperature by alternate irradiation with visible and ultraviolet light, and it is totally reversible.
研究领域:
材料科学
·
高分子化学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 9
·1581
·
IF 5.719
Zhikang Wu,Feifei Li,Xiya Li,Yang Yang,Xiao Huang,Hai Li
Due to their unique tubular and spiral structure, graphene and graphene oxide nanoscrolls (GONS) have shown extensive applications in various fields. However, it is still a challenge to improve the optoelectronic application of graphene and GONS because of the zero bandgap of graphene. Herein, ammonium tetrathiomolybdate ((NH4)2MoS4) was firstly wrapped into the ((NH4)2MoS4@GONS) by molecular combing the mixture of (NH4)2MoS4and GO solution on hydrophobic substrate. After thermal annealing, the (NH4)2MoS4and GO were converted to MoS2nanosheets and reduced GO (RGO) simultaneously, and, thus, the MoS2@RGONS was obtained. Raman spectroscopy and high-resolution transmission electron microscopy were used to confirm the formation of MoS2nanosheets among the RGONS. The amount of MoS2wrapped in RGONS increased with the increasing height of GONS, which is confirmed by the atomic force microscopy and Raman spectroscopy. The as-prepared MoS2@RGONS showed much better photoresponse than the RGONS under visible light. The photocurrent-to-dark current ratios of photodetectors based on MoS2@RGONS are ~570, 360 and 140 under blue, red and green lasers, respectively, which are 81, 144 and 35 times of the photodetectors based on RGONS. Moreover, the MoS2@RGONS-based photodetector exhibited good power-dependent photoresponse. Our work indicates that the MoS2@RGONS is expected to be a promising material in the fields of optoelectronic devices and flexible electronics.Keywords:ammonium tetrathiomolybdate;thermal annealing;MoS2@reduced graphene oxide nanoscroll;photosensitivity;photodetection
研究领域:
材料科学
·
光电材料
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Jianan Shan,Gaoming Mo,Qing Sun,Jing Huang,Qin Ouyang,Qing Huang
SiC fiber is an important structural material in high-temperature extreme environments and nuclear energy applications. Oxidation and electron irradiation are main curing methods for the fabrication of industrial SiC fibers. In this work, a photo-sensitive polyvinylaluminocarbosilane (PVACS) is facilely prepared by blending polyaluminocarbosilane (PACS) and 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane (D4Vi), which can be melt spun, cured by ultraviolet irradiation at room temperature. After thermal pyrolysis and sintering, the SiC(OAl) fibers with oxygen content of 8.84 wt% and C/Si ratio of 1.34, the SiC(Al) fibers with oxygen content of 0.29 wt% and C/Si ratio of 1.03 are achieved. The cured mechanism and the structural evolution from the precursor fiber to the final ceramic fibers is investigated. The results show that homopolymerization of D4Vi is the main curing mechanism in addition to the β-addition of hydrosilylation. Different from the typical oxidative curing, the oxygen in the fibers mainly comes from D4Vi. At about 800 ℃, the SiAl x O y phase, the SiC x O y phase and free carbon are formed. At 1200 ℃, the Al-C bonds possibly in Al 4 C 3 are formed. At around 1600 ℃, Al may exist mainly in the form of Al 4 O 4 C, and the amorphous carbon phase changes into crystalline graphitic structure. Meanwhile, a lot of mesopores and macropores in the SiC(OAl) fibers are formed due to thermal decomposition of the SiC x O y phase. However, at 1800 ℃, the SiC(Al) fibers densify again due to the formation of Al 2 OC and Al 4 SiC 4 phases, which also inhibit the growth of β-SiC and favor the formation of α-SiC.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Kai Wang,Shengjun Xu,Jingzhen Wang,Boqiang Gao,Yan Huang,Jia Song,Shuanglong Ma,Hanzhong Jia,Sihui Zhan
Revealing the structure-activity relationship between physicochemical properties and photoactivities of microplastic dissolved organic matter (MPDOM) is significant for understanding the environmental fate of MPs. Here, we systematically analyzed the physicochemical properties and molecular composition of DOM derived from MPs including polystyrene (PS), polyethylene glycol terephthalate (PET), polyadipate/butylene terephthalate (PBAT), polylactic acid (PLA), polypropylene (PP), and compared their photosensitivity and photobleaching behaviors. Results indicated that PSDOM and PETDOM had more similar properties and compositions, and showed stronger photosensitivity and photobleaching effects than PBATDOM, PLADOM and PPDOM. The [ 3 DOM ∗ ] SS and [ 1 O 2 ] SS varied in the range of 0.31–13.03 × 10 -14 and 1.71–5.49 × 10 -13 M, respectively, which were within the reported range of DOM from other sources. The SUVA 254 , HIX, AI modwa , Xc wa and lignin/CRAM-like component showed positive correlation with the [ 3 DOM ∗ ] SS , [ 1 O 2 ] SS and Φ 3 DOM* . The negative correlation between E 2 /E 3 and [ 3 DOM ∗ ] SS was due to the higher proportion of low-molecular weight components in MPDOM. The lignin/CRAM-like component was identified to be the crucial photobleaching-component. The lignin/CRAM-like in PSDOM showed a deepened oxidation degree, while its change trend in PETDOM was from unsaturated to saturated. These findings provide new insights into the relevant photochemical fate of MPDOM.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2019
·Vol. 220
·期 22
·1900349
·
IF 2.622
Lan Ding,Pengfei Zhang,Congcong Fu,Jialin Yin,Yongwang Mao,Na Liu,Shihua Li,Chunying Yang,Ronghui Zhao,Kuilin Deng
Two thermosensitive copolymers of acrylates (PMP/PEP) and a thermo/light sensitive copolymer of acrylate with acrylamide (PMABz) are synthesized via a ring-opening reaction and subsequent radical polymerization using a facile one-pot method. The lower critical solution temperature (LCST) of PMP and PEP shows a dependence on the content of the structural unit and can be easily tuned to 18–35 °C by mercaptoethanol-mediated control of the molecular weight. The isomerization of PMABz can be reversibly induced by alternating irradiation at 365 nm to produce the cis form and at 254 nm to produce the trans form. The LCST of cis -PMABz (40.3 °C) is significantly higher than that of trans -PMABz (37.8 °C) because of its higher hydrophilicity. Furthermore, the particle size of aggregated PMABz can be controlled from 665 nm (for the cis form) to 996 nm (for the trans form) during the heating run. After quenching the PMABz solution, PMABz particles have repeating patterns, such as leaf veins or hollow containers, indicating their potential applicability.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qingyan Zhang,Yuanyuan Liu,Zeyan Wang,Peng Wang,Zhaoke Zheng,Hefeng Cheng,Xiaoyan Qin,Xiaoyang Zhang,Ying Dai,Baibiao Huang
The low toxicity and good photo active property endow bismuth based metal–organic frameworks (MOFs) potential candidates for efficient light-sensitive drug carrier. In this work, SU-101, composed of Bi and ellagic acid (EA), is found to display high ciprofloxacin (CIP) loading ratio (85.8%) and controlled CIP release under light illumination (the maximum CIP release ratio is 95.56%). Further investigations suggest that hydrogen bond between the C O group in EA and the –OH group in CIP is responsible for above behavior. Light irradiation decreases the electron density around the C O group in EA, which consequently leads to the broken of the hydrogen bond and therefore the release of CIP. Further investigations suggest that SU-101 is universal for other drugs, such as norfloxacin (NOR), amoxicillin (AMO), tetracycline (TET) and doxorubicin hydrochloride (DOX), since all of them can form hydrogen bond with SU-101. This work suggests that SU-101 holds great potential as efficient light-sensitive drug carrier, and the investigation of other Bi based MOFs as drug carrier is under investigation.
研究领域:
生物医学工程
·
材料科学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）