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Visualization of on-surface polymerization

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Science china Materials 2022年第7期65卷 1989-1990页

作者： lifeng chi Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices Institute of Functional Nano&Soft MaterialsSoochow UniversitySuzhou 215123China

On-surface syntheses of one-dimensional linear structures and two-dimensional networks through polymerization have attracted increasing attention of chemists and surface scientists by providing new materials and new insights into traditional reactions. Polymerization can be divided into stepwise polymerization and chain polymerization.

关键词： polymerization. polymerization surface

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有机-有机界面效应的原位及非原位研究

物理化学学报 2024年第1期40卷 30-31页

作者：冀连连王现鹏张莹莹申学礼薛娣王璐王滋王文冲黄丽珍迟力峰苏州大学功能纳米与软物质研究院(FUNSOM) 江苏省碳基功能材料与器件高技术研究重点实验室江苏苏州215123 姑苏材料实验室江苏苏州215123 明斯特大学物理研究所和纳米中心德国明斯特48149 澳门科技大学材料科学与工程学院澳苏先进功能材料联合研究中心中国澳门999078

有机-有机异质结构已被广泛应用于各种有机电子器件,包括有机发光二极管(OLEDs)、有机场效应晶体管(OFETs)和有机太阳能电池等。全面理解有机-有机异质结构的界面效应,对于器件的设计和性能优化具有重要意义。然而由于有机半导体具有多... 详细信息

有机-有机异质结构已被广泛应用于各种有机电子器件,包括有机发光二极管(OLEDs)、有机场效应晶体管(OFETs)和有机太阳能电池等。全面理解有机-有机异质结构的界面效应,对于器件的设计和性能优化具有重要意义。然而由于有机半导体具有多样的化学特性以及分子间较弱的范德华力,界面电荷传输特性与有机-有机电子结构、环境气氛等密切相关。在此,我们报道了随着顶层半导体并五苯(pentacene)的沉积,并五苯/酞菁氧钒(VOPc)异质结构的原位实时电学性能监测。结果显示,异质结构晶体管的p型迁移率从0.4 cm2∙V−1∙s^(−1)下降至0.2 cm2∙V−1∙s^(−1),而n型迁移率从0.01 cm2∙V−1∙s^(−1)迅速增加至约0.9 cm2∙V−1∙s^(−1)。这种n型输运行为的增强归因于pentacene向VOPc的界面电子转移效应以及由此导致的VOPc层中陷阱态的填充。此外,非原位实验对比表明,当晶体管制备过程暴露于大气时会明显抑制这种界面电荷转移效应,导致沉积pentacene后n型输运几乎没有得到改善。薄膜形态、开尔文探针力显微镜(KPFM)和X射线光电子能谱(XPS)的结果表明,界面处存在从pentacene到VOPc的电子转移。进一步的密度泛函理论(DFT)计算表明,由于pentacene/VOPc之间较强的相互作用,pentacene往VOPc的电荷转移量约为0.15 e。此外,O_(2)/H2O的存在会抑制这种界面电荷转移效应,这与我们的实验结果一致。本研究通过原位电学表征对有机-有机界面之间的电荷转移效应给出了深入解释,有利于进一步的器件性能优化及界面效应分析。

关键词：有机-有机异质结构原位表征电荷转移效应有机场效应晶体管 O_(2)/H2O掺杂

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Interface terminal group regulated organic phototransistors with tunable persistent and switchable photoconductivity

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Science china Chemistry 2022年第12期65卷 2567-2575页

作者： Di Xue Yingying Zhang Weijie Gong Yao Yin Zi Wang Lizhen Huang lifeng chi Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou215123China Gusu Laboratory of Materials Suzhou215123China Macao Institute of Materials Science and Engineering(MIMSE) MUST-SUDA Joint Research Center for Advanced Functional MaterialsMacao University of Science and TechnologyTaipaMacao999078China

With both light detection and intrinsic amplification functions,organic phototransistors have demonstrated promising applications,including photodetection and *** achieve excellent photoresponse and superior photogain,a common and effective strategy is to modulate the trapping effect with the purpose of reducing recombination or prolonging the lifetime of the photogenerated charge ***,introducing trapping sites delicately is challenging and might sacrifice the response rate together with a typical persistent ***,we demonstrate a facile strategy for achieving high photo-responsive organic phototransistors with both persistent and switchable photoconductivity features via interface terminal group *** varying the terminate groups of self-assembled monolayer(SAMs)from the strong electron withdrawing group-F,neutral−CH_(3) to electron donating−NH_(2) on the dielectric surface,we realize both minority carrier trapping and majority carrier trapping in the organic phototransistor based on the C8-BTBT active *** electron withdrawing effect of F significantly enhances the minority carrier trapping process and yields a high photoresponsivity with a long-lasting persistent *** contrast,the electron donating group−NH_(2) with a distinct majority carrier trapping ability causes switchable photoconductivity so that the photocurrent can rise pronouncedly and fully decay along with light on/***,both cases can deliver high performance with photoresponsivities higher than 104 A W^(−1) together with a photosensitivity in the level of 107 and a detectivity of approximately 10^(15)–10^(16) *** a tunable,excellent photoresponse property enables the convenient exploration of organic phototransistors to satisfy different application requirements.

关键词： organic phototransistor surface modification trapping persistent photoconductivity

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Influence of SAM Quality on the Organic Semiconductor Thin Film Gas Sensors

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Chemical Research in chinese Universities 2022年第2期38卷 510-515页

作者： ZHU Lunan WANG Zi LU Jie ZHOU Xu ZENG Zhoufang HUANG Lizhen chi lifeng Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-based Functional Materials&DevicesSoochow UniversitySuzhou215123P.R.China Research and Development Center for Genetics Resource Chinese Aca-demy of SciencesChangzhou 213000P.R.China

Gas sensors based on organic semiconductors receive tremendous attentions owing to their advantages on high selectivity and room temperature operation. However, until now, most organic semiconductor based sensors still suffered from problems, such as low sensitivity, slow response/recovery speed and poor stability. In addition, a clear correlation between the sensing performance and the film property is still absent. Herein, we report the investigation on sensing performance of a series of organic films with various morphologies. By simply adjusting the quality of self-assembled monolayer(SAM) on the silicon wafer surface, we obtain organic semiconductor 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) films with varied morphologies and different charge transport abilities. The film with a small grain size and a continuous morphology presents the highest sensing performance to NO2, with a sensitivity up to 730%/ppm(ppm=parts per million, vo-lume ratio). We thus reveal that the high sensitivity of the organic film is evident related with the charge transport ability and initial conductivity of the films, as well as the morphologies of both modification layer and the active films.

关键词： Self-assembled monolayer Gas sensor Organic semiconductor Thin film growth

High-performance organic electrochemical transistors gated with 3D-printed graphene oxide electrodes

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Nano Research 2023年第11期16卷 12689-12696页

作者： Xingyu Jiang Zhiqiang Liang Miao Wu Jie Lu Cheng Shi Qi Wang Zi Wang Zhen Jin Lin Jiang Lizhen Huang lifeng chi Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Suzhou Laboratory Suzhou 215123China Analysis and Test Center Soochow UniversitySuzhou 215123China

Organic electrochemical transistors(OECTs)have garnered significant interest due to their ability to facilitate both ionic and electronic transport.A large proportion of research efforts thus far have focused on investigating high-performance materials that can serve as mixed ion doping and charge transport ***,relatively less attention has been given to the gateelectrode materials,which play a critical role in controlling operational voltage,redox processes,and stability,especially in the context of semiconductor-based OECTs working in accumulation ***,the demand for planarity and flexibility in modern bioelectronic devices presents significant challenges for the commonly used Ag/AgCl electrodes in ***,we report the construction of high-performance accumulation-mode OECTs by utilizing a gate electrode made of three-dimensional(3D)-printed graphene *** 3D-printed graphene oxide electrode incorporating one-dimensional(1D)carbon nanotubes,is directly printed using an aqueous-based ink and showcases exceptional mechanical flexibility and porosity properties,enabling high-throughput preparation for both top gates and integrated planar architecture,as well as fast ion/charge *** with high performance comparable to that of Ag/AgCl-gated OECTs are thus achieved and present promising feasibility for electrocardiograph(ECG)signal *** provides a promising choice for the application of flexible bioelectronics in medical care and neurological recording.

关键词： organic electrochemical transistors three-dimensional(3D)-printed graphene top electrodes electrocardiogram

Growth Behavior of Rubrene Thin Films on Hexagonal Boron Nitride in the Early Stage

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chinese Journal of Chemistry 2022年第11期40卷 1298-1304,I0002页

作者： Yujia Wei Di Xue Lianlian Ji Jie Lu Qi Wang Xingyu Jiang Yinghui Sun Zi Wang Lizhen Huang lifeng chi Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesCollaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhouJiangsu 215123China College of Energy Soochow Institute for Energy and Materials InnovationsKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhouJiangsu 215006China Gusu Laboratory of Materials SuzhouJiangsu 215123China

Two-dimensional materials,with an in-plane ordered and dangling-bonding-free surface,are ideal substrates for fabricating high-quality crystalline thin ***,we show a systematic study on the growth of a benchmark organic semiconductor,rubrene,on hexagonal boron nitride(h-BN)substrate via physical vapor deposition from the initial amorphous phase to the final crystalline phase;the role of temperature in such transition and the epitaxy relationship between rubrene and h-BN are *** the increase of substrate temperature,the critical thickness of amorphous-crystalline-transition decreases and the morphology of crystalline phase also evolves from porous to *** substrate temperature reaches>100℃,the critical thickness reduces to only 0.5 nm and a precise layer-by-layer growth from the very first layer is achieved,which is quite rare for rubrene growing on other *** high ordering can be attributed to the fine epitaxy relationship between rubrene films and the h-BN surface lattice,and this film demonstrates good charge transport ability with a p-type field-effect mobility of>1 cm^(2)·V^(-1)·s^(-1).

关键词： Thin films Crystal growth Organic thin film transistors 2D materials Molecular electronics

Construction of a High-Quality Organic-Inorganic Hybrid Heterostructure and Its Photo-response Performance

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chinese Journal of Chemistry 2023年第1期41卷 50-56页

作者： Yadan Zhang Guanghua Yu Di Xue Jie Lu Xing Meng Yao Yin Qi Wang Zi Wang Lizhen Huang lifeng chi Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow University199 Ren'ai RoadSuzhouJiangsu 215123China Gusu Laboratory of Materials 388 Ruoshui RoadSuzhouJiangsu 215123China Macao Institute of Materials Science and Engineering(MIMSE) MUST-SUDA Joint Research Center for Advanced Functional MaterialsMacao University of Science and TechnologyTaipa 999078MacaoChina

The combination of metal oxide and organic semiconductor for constructing organic-inorganic hybrid heterostructure is promising to offer unique optoelectronic ***,the distinct difference in electron structure and processing technology of the two types of materials makes it usually difficult to fully deliver their complementary ***,we report the construction of a high quality organic/In_(2)O_(3) hybrid heterostructure presenting a good ambipolar transport with average electron mobility>1 cm^(2)V^(-1)·s^(-1) and hole mobility up to 0.4 cm^(2)·V^(-1)·s^(-1),respectively,together with a high-gain *** addition,the incorporation with organic film on top of In_(2)O_(3) remarkably reduces the dark current,enabling the realization of high photoconductivity response with photo-sensitivity of two magnitudes higher than that of pure *** photoconductor and phototransistor of the hybrid structure demonstrate high photoresponsivity>10^(3) AW^(-1) and detectivity up to 10^(14) Jones,demonstrating the promising functionality of such a high quality hybrid heterostructure.

关键词： Sol-gel process Thin films Semiconductors Phthalocyanines Hybrid heterostructure

From n-alkane to polyacetylene on Cu(110):Linkage modulation in chain growth

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Science china Chemistry 2022年第4期65卷 733-739页

作者： Zhengming Hao Junjie Zhang Miao Xie Xuechao Li Lina Wang Ye Liu Kaifeng Niu Junbo Wang Luying Song Tao Cheng Haiming Zhang lifeng chi Institute of Functional Nano and Soft Materials(FUNSOM)and Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Soochow UniversitySuzhou 215123China Department of Physics Chemistry and BiologyLinköping UniversityLinköping 58183Sweden

Direct coupling or transformation of inert alkanes based on the selective C-H activation is of great importance for both chemistry and chemical ***,we report the coupling of polyenes that are transformed from n-dotriacontane(n-C_(22)H_(66))through on-surface cascade dehydrogenation on Cu(110)surface,leading to the formation of polyacetylene(PA).Three distinct linkages have been resolved by scanning tunneling microscope(STM)and noncontact atomic force microscope(nc-AFM).Apart from the α-type linkage which is the stemless coupling of the terminal C-C double bond in trans-configuration,β-and γ-type linkages appear as knots or defects which are,in fact,the C-C couplings in ***,the“defects”can be effectively suppressed by adjusting the surface coverage,thus making it of general interest for uniform structure modulation.

关键词： on-surface chemistry scanning tunneling microscope all-trans polyacetylene linkage chain growth

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Self-generating nanogaps for highly effective surface-enhanced Raman spectroscopy

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Nano Research 2022年第4期15卷 3496-3503页

作者： Yangkai Chen Huan Li Jianmei Chen Dong Li Mengyuan Zhang Guanghua Yu Lin Jiang Yi Zong Bin Dong Zhoufang Zeng Yandong Wang lifeng chi Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices Institute of Functional Nano&Soft Materials(FUNSOM)Joint International Research Laboratory of Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China Research and Development Center for Genetics Resource Chinese Academy of SciencesChangzhou 213000China Institute of Genetics and Development Biology Chinese Academy of SciencesBeijing 100101China

The fabrication of surface enhanced Raman spectroscopy(SERS)substrates with controlled high density hot spots still remains ***,we report highly effective SERS substrates containing the self-generating(SG)nanogaps from polystyrene nanosphere monolayer through isotropic plasma *** emergence of multimode hot spots,i.e.,metal film over nanosphere(MFON)-like hot spots(closed gaps,0 nm),individual self-aligned hot spots(discrete gaps,>20 nm)and threedimensional(3D)hot spots(nanogaps,1-10 nm),makes the SG SERS substrates superior as compared to the traditional MFON or the well-ordered self-aligned SERS substrates in terms of enhancement,uniformity,and *** SG SERS substrates can function as the excellent SERS platforms for trace molecule detection in the practical application fields.

关键词： surface-enhanced Raman spectroscopy nanogaps colloidal lithography reactive ion etching