Spectroelectrochemical Sensing Based on Multimode Selectivity Simultaneously Achievable in a Single Device. 15. Development of Portable Spectroelectrochemical Instrumentation

A portable spectroelectrochemical instrument capable of performing in situ sensing has been developed, extending the applicability of spectroelectrochemistry for chemical sensing. All components of the instrument were designed to facilitate real‐time simultaneous display of optical and electrochemical data for remote spectroelectrochemical measurements. Prior to this point in time, spectroelectrochemical measurements were confined to a laboratory setting, and remote analysis was not possible using custom or commercially available instrumentation. The novel instrumentation includes a software package for a portable computer, a small (paperback book sized) optical and electrochemical control unit, and an even smaller remote potentiostat. When the remote potentiostat is operated using fiber optic communication coupled with nine volt battery operation, the unit may operate for finite amounts of time at distances limited only by the attenuation of light in the optical fiber. Comparative studies of the custom instrument with commercially available electrochemical instrumentation were performed and showed excellent agreement. This unit was also tested using the ferricyanide/ferrocyanide reversible electrochemical couple by comparing it to bench top spectroelectrochemical instrumentation previously developed by our group.     

Inside Cover: Reactive Superhydrophobic Surfaces for Interlayer Electrical Connectivity in Three-dimensional Electronics (Angew. Chem. Int. Ed. 30/2023)

This study describes the development of a new type of amine-reactive superhydrophobic (RSH) film that is facilely coated on various substrates using a single-step process, while the versatility of this RSH film offers a reliable solution for efficient formation of complex and robust interlayer electrical connectivity (IEC) in 3D electronic systems. The excellent spatial controllability of surface amine modification enables the generation of vertical circuits in situ, providing a distinct way to connect circuits located on different layers. Moreover, the inherent superhydrophobicity and porosity exhibit the required anti-fouling and breathability properties, making the RSH-based IEC well-suited for applications where exposure to environmental gas and liquid contaminants is likely. This approach provides another avenue towards the development of IEC in 3D flexible integrated electronics, opening up new possibilities for the advancement of this field.     

Self-Doped n-Type Quinoidal Compounds with Good Air Stability and High Electrical Conductivity for Organic Electronics

Air stable n-type conductive molecules with high electrical conductivities and excellent device performance have important applications in organic electronics, but their synthesis remains challenging. Herein, we report three self-doped n-type conductive molecules, designated QnNs, with a closed-shell quinoidal backbone and alkyl amino chains of different lengths. The QnNs are self-doped by intermolecular electron transfer from the amino groups to the quinoidal backbone. This process is ascertained unambiguously by experiments and theoretical calculations. The use of a quinoidal structure effectively improves the self-doping level, and thus increases the electrical conductivity of self-doped n-type conductive molecules achieved by a closed-shell structure from<10⁻⁴ S cm⁻¹ to>0.03 S cm⁻¹. Furthermore, the closed-shell quinoidal structure results in good air stability of the QnNs, with half-lives>73 days; and Q4N shows an electrical conductivity of 0.019 S cm⁻¹ even after exposure to air for 120 days. When applying Q6N as the cathode interlayer in organic solar cells (OSCs), an outstanding power conversion efficiency of up to 18.2 % was obtained, which represents one the best results in binary OSCs.     

π-Extended Pyrrole-Fused Heteropine: Synthesis,Properties, and Application in Organic Field-Effect Transistors

Sulfur-embedded polycyclic aromatic compounds have been used as building blocks for numerous organic semiconductors over the past few decades. While the success is based on thiophene-containing compounds, aromatic compounds that contain thiepine, a sulfur-containing seven-membered-ring arene, has been less well investigated. Here we report the synthesis and properties of π-extended pyrrole-fused heteropine compounds such as thiepine and oxepine. A π-extended pyrrole-fused thiepine exhibited a “pitched π-stacking” structure in the crystal, and exhibited a high charge carrier mobility of up to 1.0 cm² V⁻¹ s⁻¹ in single-crystal field-effect transistors.     

HT-7等离子体密度反馈控制系统的研究

介绍了HT－7等离子体密度反馈控制系统,分析了影响等离子体密度控制的因素,改进了密度反馈控制方式,使控制系统密度反馈更为完整、规范,实现了控制系统从单纯的反馈控制向多功能转化。给出了在HT－7装置上的实验结果,并提出了进一步改进的措施。     

几种电子封装技术在便携式电子产品中的应用

简要阐述了便携式电子产品在制造中采用的几种封装技术,即;倒装芯片、MCM、WLP等,及对其利弊进行了分析,并对技术现状进行了简要说明。     

Synthesis and characterization of (R)-miniPEG-containing chiral γ-peptide nucleic acids using the Fmoc strategy

Diethylene glycol (miniPEG)-containing chiral γPNA is considered to be one of the best PNA derivatives. Its preparation is mainly based on the Boc strategy for solid phase peptide synthesis (SPPS), requiring the repeated use of trifluoroacetic acid TFA, which is not suitable for the in situ synthesis of PNA arrays and some other applications under mild conditions. Herein, Fmoc/Cbz orthogonal protected miniPEG-containing chiral γPNA monomers were synthesized, and a 15mer γPNA was prepared using the Fmoc strategy under mild conditions.     

Subtle structure tailoring of metal-free triazine luminogens for highly efficient ultralong organic phosphorescence

Ultralong organic phosphorescent materials have invoked considerable attention for their great potential in sensing, data encryption, information anti-counterfeiting and so forth. However, effective ways to achieve highly efficient ultralong organic phosphorescence (UOP) in metal-free organic materials remain a great challenge. Herein, we designed three isomers based on asymmetric triazines with various bromine substituted positions. Impressively, phosphorescence efficiency of p-BrAT in solid state can reach up to 9.7% with a long lifetime of 386 ms, which was one of the highest efficient UOP materials reported so far. Theoretical calculations further demonstrated that para-substitution exhibited the most effective radiative transition for triplet excitons. These results will provide an effective approach to achieving highly efficient UOP materials.     

面向电子装联的PCB可制造性设计

表面安装技术在在电子产品装联生产过程中正得到广泛应用。而印制板的合理设计是SRT技术中的关键,也是SHT工艺质量的保证,本文就表面安装PCB设计时需考虑的一些制造工艺性问题进行了阐述,给PCB设计人员提供一个参考。     

共晶炉控制系统的开发及工艺研究

共晶技术是近几年发展起来的新型微组装工艺,较传统的粘接工艺有许多优点,应用日趋广泛.共晶炉是用于共晶粘接的专用设备.结合设备的结构和控制原理,对共晶炉控制硬件和软件系统的设计开发进行了详细阐述;同时,结合设备对共晶工艺和工艺参数进行了论述.