Jia Chuancheng

• University of California, Los Angeles

Hot holes in Pt‐Cu alloy clusters can act as catalyst to accelerate the intrinsic aerobic oxidation reactions. It is described that under visible light irradiation the synergistic alcohol catalytic oxidation on Pt‐Cu alloy clusters (≈1.1 nm)/TiO2 nanobelts could be significant promoted by interband‐excitation‐generated long‐lifetime hot holes in th...

As a foundational technology in quantum information science (QIS), the manipulation and detection of quantum spins enable precise control, opening new avenues for significant advancements. Early research focused on macroscopic ensemble quantum systems, where electron spin resonance is used to coherently address electron spins within different ensem...

The electronic distribution characteristics of molecules significantly influence the charge transport properties and the device performance of molecular electronic devices. These characteristics are closely related to subtle molecular structures, forming a formidable challenge for effective control. Here, a flexible crown ether moiety is integrated...

Gaining deep understanding and effective regulation of the charge transport mechanism within molecular junctions is essential for the development of electronic devices. In this work, a series of hexabenzocoronene‐based single‐molecule junctions are successfully constructed, and their temperature‐dependent charge transport properties are studied. It...

Compared with aggregate spin behavior, single‐molecule spin behavior can be accurately understood, controlled, and applied at the level of basic building blocks. The potential of single‐molecule electronic and nuclear spins for monitoring and control represents a beacon of promise for the advancement of molecular spin devices, which are fabricated...

Olefin metathesis, as a powerful metal-catalysed carbon–carbon bond-forming method, has achieved considerable progress in recent years. However, the complexity originating from multicomponent interactions has long impeded a complete mechanistic understanding of olefin metathesis, which hampers further optimization of the reaction. Here, we clarify...

Detecting chemical reaction dynamics at solid-liquid interfaces is important for understanding heterogeneous reactions. However, there is a lack of exploration of interface reaction dynamics from the single-molecule perspective, which can reveal the intrinsic reaction mechanism underlying ensemble experiments. Here, single-event protonation reactio...

Single molecules, the smallest independently stable units in the material world, serve as the fundamental building blocks of matters. Among different branches of single-molecule sciences, single-molecule chemical reactions, by revealing the behavior and properties of individual molecules at the molecular scale, are particularly attractive because t...

2D materials (2DMs), known for their atomically ultrathin structure, exhibit remarkable electrical and optical properties. Similarly, molecular self‐assembled monolayers (SAMs) with comparable atomic thickness show an abundance of designable structures and properties. The strategy of constructing electronic devices through unique heterostructures f...

Chemical substitution represents a pivotal method that enables effective modulation of molecular conductance and production of multiple transport channels, quantum interference effects, and other mechanisms. However, the intricate interplay that occurs between the molecular backbone and the side motifs remains largely unexplored. This study explore...

In recent decades, there has been a significant increase in the application of single‐molecule electrical analysis platforms in studying proteins and peptides. These advanced analysis methods have the potential for deep investigation of enzymatic working mechanisms and accurate monitoring of dynamic changes in protein configurations, which are ofte...

Molecules, with structural, scaling, and interaction diversities, are crucial for the emergence of complex behaviors. Interactions are essential prerequisites for complex systems to exhibit emergent properties that surpass the sum of individual component characteristics. Tracing the origin of complex molecular behaviors from interactions is critica...

The transformation from one compound to another involves the breaking and formation of chemical bonds at the single-bond level, especially during catalytic reactions that are of great significance in broad fields such as energy conversion, environmental science, life science and chemical synthesis. The study of the reaction process at the single-bo...

In aromatic systems with large π-conjugated structures, armchair and zigzag configurations can affect each material's electronic properties, determining their performance and generating certain quantum effects. Here, we explore the intrinsic effect of armchair and zigzag pathways on charge transport through single hexabenzocoronene molecules. Theor...

The electronic characteristics of organic optoelectronic materials determine the performance of corresponding devices. Clarifying the relationship between molecular structure and electronic characteristics at the single-molecule level can help to achieve high performance for organic optoelectronic materials and devices, especially for organic photo...

Stereochemistry has an essential role in organic synthesis, biological catalysis and physical processes. In situ chirality identification and asymmetric synthesis are non-trivial tasks, especially for single-molecule systems. However, going beyond the chiral characterization of a large number of molecules (which inevitably leads to ensemble averagi...

Single‐biomolecule electronic sensing techniques are of great importance in many fields, from medical diagnosis to disease surveillance. As the physiological changes of single biomolecules can be converted into measurable electrical signals, single‐molecule electronic biosensors can realize real‐time, highly sensitive, and high‐bandwidth detection...

Graphene is a 2D material with fruitful electrical properties, which can be efficiently prepared, tailored, and modified for a variety of applications, particularly in the field of optoelectronic devices thanks to its planar hexagonal lattice structure. To date, graphene has been prepared using a variety of bottom–up growth and top–down exfoliation...

Single-molecule non-volatile memories can be designed as high-density memories and memristors. The latter, enabling real-time data processing by performing computations directly within the memory unit, holds the potential to surpass...

Developing new materials is a long-standing goal that extends across the fields of synthesis, catalysis, nanotechnology and materials science. Transforming one compound or material into another involves the gaining, losing and sharing of electrons at a molecular level. Investigating single-molecule reactions — and understanding how they provide inf...

Single-atom catalysts based on noble metals provide efficient atomic utilization along with enhanced reactivity. Herein, a convenient strategy to construct atomically dispersed palladium catalyst on layered potassium titanate (KTO), which has enhanced interaction between the TiO6 layer and the palladium atoms, is presented. Due to the presence of K...

The PNP structure realized by energy band engineering is widely used in various electronic and optoelectronic devices. In this work, we succeed in constructing a PNP-type single-molecule junction and explore the intrinsic characteristics of the PNP structure at the single-molecule level. A back-to-back azulene molecule is designed with opposite ∼1....

The miniaturization of silicon-based electronics has motivated considerable efforts in exploring new electronic materials, including two-dimensional semiconductors and halide perovskites, which are usually too delicate to maintain their intrinsic properties during the harsh device fabrication steps. Here we report a convenient plug-and-probe approa...

Intermolecular charge transport plays a vital role in the fields of electronics, as well as biochemical systems. Here, we design supramolecular dimer junctions and investigate the effects of charge state and energy level alignment on charge transport under nanoconfinement. Incoherent tunneling caused by thermally‐induced vibrations is enhanced in p...

Intermolecular charge transport plays a vital role in the fields of electronics, as well as biochemical systems. Here, we design supramolecular dimer junctions and investigate the effects of charge state and energy level alignment on charge transport under nanoconfinement. Incoherent tunneling caused by thermally‐induced vibrations is enhanced in p...

Precise tuning of chemical reactions with predictable and controllable manners, an ultimate goal chemists desire to achieve, is valuable in the scientific community. This tunability is necessary to understand and regulate chemical transformations at both macroscopic and single-molecule levels to meet demands in potential application scenarios. Here...

Stacking interactions are of significant importance in the fields of chemistry, biology, and material optoelectronics because they determine the efficiency of charge transfer between molecules and their quantum states. Previous studies have proven that when two monomers are π-stacked in series to form a dimer, the electrical conductance of the dime...

Controllable edge-selective modification and tailoring of graphene are particularly critical for graphene applications. In this study, precise edge functionalization and tailoring of graphene are realized by a solvent-controlled Friedel-Crafts acylation reaction. Specifically, experimental and theoretical studies demonstrate that solvent effects ca...

Measurements on single molecules can sometimes reveal features that can be difficult to detect using techniques that probe the averaged properties of many molecules. Here, we report on the use of graphene-molecule-graphene single-molecule junctions (GMG-SMJs) to probe the shuttling dynamics of an individual [2]rotaxane molecule. The experiments sho...

Molecular machines can convert the chemical energy into the mechanical work through intra- or intermolecular motions at the single-molecule scale under external stimuli, such as heating, illumination, and so on. In recent decades, the working mechanisms of various molecular machines, such as molecular shuttles, molecular motors, molecular walkers,...

The development of pressure sensor arrays capable of distinguishing the shape and texture details of objects is of considerable interest in the emerging fields of smart robots, prostheses, human-machine interfaces, and artificial intelligence (AI). Here we report an integrated pressure sensor array, by combining solution-processed two-dimensional (...

The scalable preparation of high-purity monolayers is essential for practically integrating two-dimensional (2D) semiconductors in diverse technologies but remains a persistent challenge. Previous efforts to exfoliate 2D layered crystals by the organic ammonium intercalation usually produce few-layer nanosheets owing to a self-retarding effect that...

Heterostructures with designable electronic interfaces represent the material foundation for modern electronic and optoelectronic devices. The conventional heterostructures rely on covalent bonds to integrate the constituent materials with strict lattice-matching requirements. The use of van der Waals (VDW) force allows a bond-free strategy to inte...

All-inorganic lead halide perovskites have attracted tremendous interest for their excellent stability when compared with hybrid perovskites. Here we report a large-area growth of monocrystalline all-inorganic perovskite thin films and further patterning them into heterostructure arrays. We show that highly oriented CsPbBr3 microcrystal domains can...

Two-dimensional (2D) semiconductors are attractive for electronic devices with atomically thin channels. However, controlling the electronic properties of the 2D materials by incorporating impurity dopants is inherently difficult due to the limited physical space in the atomically thin lattices. Here we show that a solid-state ionic doping approach...

Lead halide perovskites have attracted increasing interest for their exciting potential in diverse optoelectronic devices. However, their charge transport properties remain elusive, plagued by the issues of excessive contact resistance and large hysteresis in ambient conditions. Here we report a van der Waals integration approach for creating high-...

Pd clusters supported on alkali titanate (Na- and K-titanate) nanobelts were synthesized and investigated for the catalytic HCHO oxidation at room temperature. The presence of interlayer alkali metal promoted the dispersion of Pd species and simultaneously made the Pd clusters more negatively charged, thus enhancing the catalytic performance for HC...

To realize single‐molecule field‐effect transistors, a crucial test for evaluating the integrity of single‐molecule electronics into conventional circuit architectures, remains elusive. Though interfacial effect is widely accepted to be crucially important in electronic devices, rare reports have studied fine control of the interface in single‐mole...

Controlling charge transport through molecular tunnel junctions is of crucial importance for exploring basic physical and chemical mechanisms at the molecular level and realizing the applications of molecular devices. Here, through a combined experimental and theoretical investigation, we demonstrate redox control of cross-plane charge transport in...

Toward memristor scaling, it becomes increasingly challenging to maintain reliable switching as the interelectrode distance shrinks to smaller and smaller scale. In particular, the memristive active layers are usually fragile and prone to metal-integration-induced damage. To adapt an ultrathin active switching layer for low-voltage operation requir...

Semiconductor nanowires have attracted extensive interest as one of the best-defined classes of nanoscale building blocks for the bottom-up assembly of functional electronic and optoelectronic devices over the past two decades. The article provides a comprehensive review of the continuing efforts in exploring semiconductor nanowires for the assembl...

If single-molecule, room-temperature, quantum interference (QI) effects could be translated into massively parallel arrays of molecules located between planar electrodes, QI-controlled molecular transistors would become available as buildingblocks for future electronic devices. Here, we demonstrate unequivocal signatures of room-temperature QI in v...

Two-dimensional (2D) materials, consisting of atomically thin crystal layers bound by the van der Waals force, have attracted much interest because of their potential in diverse technologies, including electronics, optoelectronics and catalysis1-10. In particular, solution-processable 2D semiconductor (such as MoS2) nanosheets are attractive buildi...

Molecular transistors operating in the quantum tunneling regime represent potential electronic building blocks for future integrated circuits. However, due to their complex fabrication processes and poor stability, traditional molecular transistors can only operate stably at cryogenic temperatures. Here, through a combined experimental and theoreti...

Graphene with atomically smooth and configuration-specific edges plays the key role in the performance of graphene-based electronic devices. Remote hydrogen plasma etching of graphene has been proven to be an effective way to create smooth edges with a specific zigzag configuration. However, the etching process is still poorly understood. In this s...

Achieving gate control with atomic precision, which is crucial to the transistor performance at the smallest size scale, remains a challenge. Here we report a new class of aromatic‐ring molecular nanotransistors based on graphene‐molecule‐graphene single‐molecule junctions by using an ionic liquid gate for the first time. Both experimental phenomen...

The mechanisms of chemical reactions, including the transformation pathways of the electronic and geometric structures of molecules, are crucial for comprehending the essence and developing new chemistry. However, it is extremely hard to realize at the single-molecule level. Here we report a single-molecule approach capable of electrically probing...

The hydrogen bond represents a fundamental interaction widely existing in nature, which plays a key role in chemical, physical and biochemical processes. However, hydrogen bond dynamics at the molecular level are extremely difficult to directly investigate. Here, in this work we address direct electrical measurements of hydrogen bond dynamics at th...

Carbon nanoelectrodes with nanogap are reliable platforms for achieving ultra-small electronic devices. One of the main challenges in fabricating nanogapped carbon electrodes is precise control of the gap size. Herein, we put forward an electroburning approach for controllable fabrication of graphene nanoelectrodes from preprocessed nanoconstrictio...

Single-molecule detection can reveal time trajectories and reaction pathways of individual intermediates/transition states in chemical reactions and biological processes, which is of fundamental importance to elucidate their intrinsic mechanisms. We present a reliable, label-free single-molecule approach that allows us to directly explore the dynam...

Effectively controlling photoinduced charge transport at the heterointerface is of crucial importance for improving the performance of photovoltaic devices. On the basis of an ipsilateral selective electron tunneling (ISET) mechanism, here this study investigates photoinduced charge transport and photovoltaic conversion at a simplified dye/single-l...

The phenomena of charge/energy transfer commonly exist at most heterointerfaces. These processes vary with the change of the electronic structure at the interface, which leads to the diversity of device functionalities. Therefore, interface engineering is a powerful approach to control the charge/energy transfer behavior by modulating the interfaci...

Conventional narrowband photodetection is enabled by coupling broadband photodetectors with complex optical filters. The recently reported charge collection narrowing, an alternative filter-free strategy, attains very narrowband photodetection at the sacrifice of sensitivity. Herein, a new strategy is proposed to customize the responsive spectrum w...

Exploring the charge transport process in molecular junctions is essential to the development of molecular electronics. Here, we investigate the temperature-dependent charge transport mechanism of carbon electrode-diarylethene single-molecule junctions, which possess photocontrollable molecular orbital energy levels due to reversible photoisomeriza...

Xuefeng Guo and co-workers discuss the approach of single-molecule electrical detection in article number 1700071. This has the potential of being a mainstream methodology capable of studying single-molecule/single-event dynamics in an interdisciplinary realm. This is because it provides a reliable and promising platform to probe detailed informati...

Supplementary

Biphenyl, as the elementary unit of organic functional materials, has been widely used in electronic and optoelectronic devices. However, over decades little has been fundamentally understood regarding how the intramolecular conformation of biphenyl dynamically affects its transport properties at the single-molecule level. Here, we establish the st...

We present an efficient strategy through surface functionalization to build a single silicon nanowire field-effect transistor-based biosensor that is capable of directly detecting protein adsorption/desorption at the single-event level. The step-wise signals in real-time detection of His-tag F1-ATPases demonstrate a promising electrical biosensing...