Nanomaterials
·
2021
·Vol. 11
·期 12
·3192
·
IF 5.076
Hao Xu,Liangjing Zhang,Aiwu Wang,Juan Hou,Xuhong Guo
Photochromic materials have attracted increasing attention. Here, we report a novel photo-reversible color switching system based on oxygen-vacancy-engineered MoOxnanostructures with water/N-methyl-2-pyrrolidone (NMP) as solvents. In this work, the system rapidly changed from colorless to blue under UV irradiation (360–400 nm) and slowly recovered its colorless state under visible light irradiation. The obtained oxygen vacancy-engineered MoOxnanostructures exhibited good repeatability, chemical stability, and cycling stability. Upon UV light irradiation, H+was intercalated into layered MoOxnanostructures and the Mo6+concentration in the HxMoOxdecreased, while the Mo5+concentration increased and increased oxygen vacancies changed the color to blue. Then, it recovered its original color slowly without UV light irradiation. What is more, the system was highly sensitive to UV light even on cloudy days. Compared with other reported photochromic materials, the system in this study has the advantage of facile preparation and provides new insights for the development of photochromic materials without dyes.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2025
·
IF 3.9
Xiaoqing Sun,Chongwen Yu,Xingyao Liu,Taolve Wang,Xigao Jian,Yujie Song,Jian Xu
Polyimide (PI) exhibits good thermal performance and high stability due to its highly rigid main chain and excellent mechanical properties, making it an ideal electrochromic material. However, its applicability is limited by poor solvent solubility, which results from the rigid backbone, and film yellowing, caused by charge-transfer complexes (CTC). Herein, a novel phenothiazine-based diamine (THZ-DA) was synthesized, where a universal joint-like structure was constructed during its formation. The introduction of the non-coplanar universal joint reduced intermolecular interactions and suppressed CTC formation, improving the solubility and enabling high transmittance of THZ-PIs in the neutral state. Moreover, the lone pair of electrons on the nitrogen atom of THZ allowed for the formation of a cationic radical (THZ+·) under electrochemical oxidation, which was stabilized by the resonance effect, enabling reversible color switching between colorless and orange–red state. Among the three systems, THZ-b, composed of THZ-DA and 3,3’,4,4’-biphenyl tetracarboxylic dianhydride, showed the best thermal stability, with a Td5% above 406 °C and Tg of 347 °C. It also exhibited good electrochemical cycling stability, with redox potentials of 1.09 and 0.88 V, as well as excellent electrochromic performance, achieving an electrochromic efficiency of 222 cm2 C–1. These results show the application potential of THZ-PI in smart windows and adaptive camouflage.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jing Li,Yue Li,Wenhua Zhao,Li Liang,Edwin Yue Bun Pun,Hai Lin
Dynamically stimulated color-changing materials provide channels within a multidimensional spatial platform and hold significant potential in the field of information bearing. However, manipulating the photochromic conversion of individual lanthanide emitters and external stimuli to achieve color-switchable emission remains a challenge. Here, multiphonon relaxation between energy levels and cross-relaxation among ions have been manipulated to control the population distribution of different energy levels in Eu 3+ ions doped ultra-low-phonon energy Cs 2 NaYCl 6 (CNYC) crystals, finally achieving full-spectral color switching. Interestingly, the introduction of Tb 3+ , not only enriches the interaction of color information in the spatial dimension, but the water-stimulated phase transition, which triggers the energetic coupling between the Tb 3+ and Eu 3+ ions in the lattice. By controlling the water-soaking time, the reversible change in luminescence color from red-orange to yellow to green have been observed. When these materials encode information, the effectiveness of anti-counterfeiting is verified by demonstrated experiment. In this study, a breakthrough in reversible phase transition of CNYC triggered by water have been observed, and a multidimensional synergistic anti-counterfeiting platform, encompassing spacetime security − photoresponsive channel switching − stimulus remodeling, have been innovatively established. These have promoted the development and improvement of anti-counterfeiting mechanisms.
研究领域:
材料科学
·
光学
·
信息加密
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 49
·2204484
·
IF 15.153
Yibo Chen,Zhi-Han Zuo,Zhao-Qing Liu,Yadong Yin
Drop-casting manganese oxide (MnO 2 ) hollow nanospheres synthesized via a simple surface-initiated redox route produces thin films exhibiting angle-independent structural colors. The colors can rapidly change in response to high-humidity dynamic water vapor (relative humidity > 90%) with excellent reversibility. When the film is triggered by dynamic water vapor with a relative humidity of ≈100%, the color changes with an optimal wavelength redshift of ≈60 nm at ≈600 ms while there is no shift under static water vapor. The unique selective response originates from the nanoscale porosity formed in the shells by randomly stacked MnO 2 nanosheets, which enhances the capillary condensation of dynamic water vapor and promotes the change of their effective refractive index for rapid color switching. The repeated color-switching tests over 100 times confirm the durability and reversibility of the MnO 2 film. The potential of these films for applications in anti-counterfeiting and information encryption is further demonstrated by reversible encoding and decoding initiated exclusively by exposure to human breath.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 45
·38897-38905
·
IF 3.289
Shaochen Zhou,Yingxuan Li,Fu Wang,Chuanyi Wang
Discrete electron energy levels emerge in ultra small metal clusters due to a strong quantum confinement effect, resulting in some intriguing, unique and superior features such as photoluminescence and catalytic activity. In the present work, silane-capped copper clusters were synthesized by a facile one-pot synthetic protocol for the first time. Electrospray ionization mass spectrometry data shows that the metal core of the cluster is mainly composed of 4–5 copper atoms, and the results of X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy indicate that the surface of the as-synthesized copper clusters is capped by a silane stabilizer. These few-atom copper clusters exhibit a dual-peak fluorescence feature, giving emission bands centered at 410 nm and 580 nm, respectively. In addition, the copper clusters also show excellent performance in chemo-sensing of hydrogen peroxide, linearly responding in a concentration range of 5–250 μM. More interestingly, a photo-reversible color switching system based on the redox reaction of methylene blue was built up by employing these Cu clusters as a catalyst. Reduction of methylene blue by Cu clusters' chemo-catalysis at ambient conditions and oxidation of leucomethylene blue by those clusters' photocatalysis under UV light irradiation lead to a recyclable colorless-blue switching effect within ∼3 minutes. The present work proves that the versatile silane-capped Cu clusters possess both molecular and semiconductor like properties, holding great promise in optical and catalytic application fields.
研究领域:
材料科学
·
光学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2016
·
IF 5.886
Huai-Rong Zhang,Yin-Zhu Wang,Wei Zhao,Jing-Juan Xu,Hong-Yuan Chen
In this work, we developed a visual electrochemiluminescence (ECL) sensing platform based on a dual-bipolar electrode (D-BPE) array chip. The chip was composed of two arrays of BPEs and three separated arrays of reservoirs filled with buffer, Ru(bpy)32+-TPrA and luminol solutions, respectively. Both BPEs served as ECL reporting platforms. By applying 6.0 V voltage, an array of orange electrochemiluminescence (ECL) signals belonging to Ru(bpy)32+ turned on. After adding DNAzyme and H2O2 in Ru(bpy)32+ and luminol reservoirs, the orange Ru(bpy)32+ signals decreased until vanished due to the quenching effect; meanwhile, a new array of blue ECL signals turned on because of the luminol-H2O2 ECL reaction. The designed D-BPE owns superior properties compared with the three-electrode system benefiting from the quantitative relation of bipolar systems, which greatly enhanced the ECL detection sensitivity. Meanwhile, the visual color-switch ECL and the ratiometric detecting principle made the results easier to evaluate and more accurate. Quantitative detection of HL-60 cancer cells from 320 cells/mL to 2.5 × 105 cells/mL with two linear ranges was achieved. The detection limit was down to 80 cells/mL. Finally, this D-BPE chip could distinguish the tumor cells from normal cells and provide a prospect for cancer diagnosis in a high-throughput, visual way.
研究领域:
生物传感
·
医学诊断
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 10
·2300056
·
IF 9
Min Liu,Shu-Hua Ma,Hui Dong,Feng-Lian Zeng,Xue-Ting Jin,Yang-Hui Luo
Photoreversible color-switching materials, which can reversibly change color in response to external light stimuli, have attracted increasing attention for their applications in time-sensitive information storage and optical data storage fields. But most of the related materials are dyes or redox compounds with ultraviolet as the light source, dramatically limiting the cycling stability during discoloration processes. To address this problem, a near-infrared (NIR)-responsive rewritable paper via doping layered Co-metal–organic frameworks (MOFs) into the stable polyvinylidene fluoride matrix is reported for the first time. Layered Co-MOF shows a rapid color-switching characteristic between orange and black blue upon NIR illumination on/off because of the interlayer spacing changes. Benefiting from the soft network structures of the matrix, Co-MOF can be homogeneously distributed to deliver an outstanding reversibility performance, including rapid response, coloration in a short period, and decoloration within about 3 min in ambient air. The fabrication of new photoreversible color switching system holds great potential in communication security, which offers a viable pathway to achieve ink-free photoreversible printing.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 47
·2304204
·
IF 13.3
Junni Xie,Shuxin Wei,Wei Lu,Shuangshuang Wu,Yi Zhang,Ruijia Wang,Ning Zhu,Tao Chen
Utilization of life-like hydrogels to replicate synergistic shape/color changeable behaviors of living organisms has been long envisaged to produce robust functional integrated soft actuators/robots. However, it remains challenging to construct such hydrogel systems with integrated functionality of remote, localized and environment-interactive control over synergistic discoloration/actuation. Herein, inspired by the evolution-optimized bioelectricity stimulus and multilayer structure of natural reptile skins, electronically innervated fluorescence-color switchable hydrogel actuating systems with bio-inspired multilayer structure comprising of responsive fluorescent hydrogel sheet and conductive Graphene/PDMS film with electrothermal effect is presented. Such rational structure enables remote control over synergistic fluorescence-color and shape changes of the systems via the cascading “electrical trigger-Joule heat generation-hydrogel shrinkage” mechanism. Consequently, local/sequential control of discoloration/actuation are achieved due to the highly controllable electrical stimulus in terms of amplitude and circuit design. Furthermore, by joint use with acoustic sensors, soft chameleon robots with unprecedented environment-interactive adaptation are demonstrated, which can intelligently sense environment signals to adjust their color/shape-changeable behaviors. This work opens previously unidentified avenues for functional integrated soft actuators/robots and will inspire life-like intelligent systems for versatile uses.
研究领域:
材料科学
·
生物仿生学
·
软体机器人
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Xijun Fu,Guoqing Li,Shaoyong Cai,Heng Yang,Kang Lin,Miao He,Junwei Wen,Houbin Li,Yabo Xiong,Dongzhi Chen,Xinghai Liu
Many anti-counterfeiting inks have been explored recently, most of them are commonly involved in weak fastness, high cost and long-term toxicity, impeding their real-life applications. Herein, an environment-friendly and inexpensive anti-counterfeiting ink with excellent fastness is reported. The untifake ink is developed by combining hybrid dots (silicon/carbon) with hydroxyethyl cellulose (HEC) binder. Interestingly, the HEC binder can effectively prevent from aggregation-induced quenching of hybrid dots. Subsequently, the customized patterns are successfully transferred onto different surfaces of various substrates including cotton fabric, cellulosic paper, glass, metal, silicon wafer and PET film, using the as-prepared ink by screen-printing technique, exhibiting that the hybrid dots/HEC ink possesses widespread practicability. Notably, fluorescent color of these patterns can be switchable by adjusting environmental pH-value, further imparting the as-prepared ink with excellent covert performance. This new fluorescent hybrid dots/HEC ink will be promising candidates for high-level anti-counterfeiting applications including food packaging, apparel and documents.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Jiaxin Zhao,Mingjuan Zhou,Yan Zhou,Danming Chao
Multi-stimulus-responsive materials have been intensively explored due to their wide applications of sensors, controlled drug release, and intelligent devices. However, color/fluorescence dual-switching response to the multiple external triggers has rarely been reported. We present here the multi-stimuli-responsive color/fluorescence dual-switching behavior of a novel hyperbranched polyamidoamine bearing viologen and adamantane units through one-pot Michael addition polymerization coupled with terminal modification tactic. This fascinating color/fluorescence dual-switching behavior is originated from conformation change (protonation/deprotonation of tertiary amines), reversible aggregation/de-aggregation (hydrophilic/hydrophobic balance modulation by adamantanes), and molecular structure transition (redox of viologens) within a polymer scaffold upon multiple environmental stimuli of pH value, heat, and electric potential. This delicate molecular design provides an alternative avenue toward a new class of smart, adaptive, and responsive polymers.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Jing Ding,Mengming Sun,Jinming Liu,Xueqiang Liu,Wenlong Hou,Lu Liu,Haiquan Zhang
The photophysical properties of the hydrogen bond complexes consisting of low-barrier hydrogen bond (LBHB) depend on their environmental condition. However, the stimuli responsive materials based on LBHB are still a challenging problem. Here, we report a novel material system which has high color response to CO 2 based on the position changes of the proton between the two heavy atoms in the low barrier hydrogen bond. Perylene diimide radical anion/branched polyethyleneimine hydrogen bonding complex (TFPDI-b-PEI) linked by low-barrier hydrogen bond ([O 1 -----H 1 ---N 1 ] −1 ) is obtained and it shows the maximum absorption of 789 nm. Meanwhile, the maximum absorption of TFPDI-b-PEI appears at 561 nm with purple when CO 2 is adsorbed in the branched polyethyleneimine . In essence, the geometry of LBHB in TFPDI-b-PEI can switch between two types of hydrogen bond ([O 1 ----H 1 ----N 1 ] −1 and [O 1 -----H 1 ---N 1 ] −1 ) via adjusting the interaction between the surrounding molecule and amine groups in LBHB by interaction of CO 2 with TFPDI-b-PEI. Further the TFPDI-b-PEI shows excellent color switching and colorimetric sensing performance for CO 2 aqueous solution and its gas based on this hydrogen bond dynamic characteristic.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 21
·4662-4667
·
IF 5.066
Yu-Mo Zhang,Fuli Xie,Wen Li,Yuyang Wang,Weiran Zhang,Xiaojun Wang,Minjie Li,Sean Xiao-An Zhang
A new multi-stimuli-responsive molecular switch M5 with a methyl ketone bridge has been developed to fabricate a visible-near infrared absorbing electrochromic device. The basochromic and electrochromic properties of methyl ketone M5 with nitronaphthalene were studied in detail using a spectroelectrochemical method and density functional theory (DFT) calculations. The colorless M5 can be switched to green-yellow with broad visible-near infrared absorption (400–500 nm, 550–800 nm), stimulated by base and electricity. And a multi electron transfer–proton transfer mechanism (electrobase) of electrochromism for M5 has been proved using cyclic voltammetry (CV) and in situ UV-vis spectroscopy. This multi-stimuli-responsive color switch has been successfully applied in an electrochromic device with attractive properties such as short switching time and good reversibility.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）