<i>In situ</i> photoconductivity measurements of imidazole in optical fiber break-junctions

Zhao, Zhikai; Guo, Chenyang; Ni, Lifa; Zhao, Xueyan; Zhang, Surong; Dong, Xiaopeng

doi:10.1039/d1nh00031d

Cited by 26 publications

(21 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5(b)). Similarly, using a set of junctions based on alkyl thiolated molecules with different lengths and an identical HOMO-LUMO energy gap, photocurrents were observed under laser irradiation, and the magnitude of the rectification can be used further to provide an accurate evaluation of the enhancement effect of the plasmonic field on gaps of different sizes 55 . In addition to the alkyl chain molecules, the photocurrent generation mechanism in other single-molecule devices with smaller molecules that are difficult to excite under corresponding light irradiation is also considered to be photo-assisted tunneling.…”

Section: Photo-assisted Transport Mechanism Of Singlemolecule Devicesmentioning

confidence: 99%

See 1 more Smart Citation

Single-molecule optoelectronic devices: physical mechanism and beyond

Li¹,

Chen²,

Wang³

et al. 2022

OEA

Self Cite

View full text Add to dashboard Cite

Single-molecule devices not only promise to provide an alternative strategy to break through the miniaturization and functionalization bottlenecks faced by traditional semiconductor devices, but also provide a reliable platform for exploration of the intrinsic properties of matters at the single-molecule level. Because the regulation of the electrical properties of single-molecule devices will be a key factor in enabling further advances in the development of molecular electronics, it is necessary to clarify the interactions between the charge transport occurring in the device and the external fields, particularly the optical field. This review mainly introduces the optoelectronic effects that are involved in single-molecule devices, including photoisomerization switching, photoconductance, plasmon-induced excitation, photovoltaic effect, and electroluminescence. We also summarize the optoelectronic mechanisms of single-molecule devices, with particular emphasis on the photoisomerization, photoexcitation, and photo-assisted tunneling processes. Finally, we focus the discussion on the opportunities and challenges arising in the single-molecule optoelectronics field and propose further possible breakthroughs.

show abstract

Section: Photo-assisted Transport Mechanism Of Singlemolecule Devicesmentioning

confidence: 99%

“…Figure reproduced with permission from: (a) ref 54 ,. Springer Nature; (b) ref 55 ,. American Chemical Society; (c, d) ref 56 ,.…”

mentioning

confidence: 99%

Single-molecule optoelectronic devices: physical mechanism and beyond

Li¹,

Chen²,

Wang³

et al. 2022

OEA

Self Cite

View full text Add to dashboard Cite

show abstract

“…The molecular structure will be rearranged under the stimulation of light, resulting in a change in molecular conductance, which can be detected by single-molecule electrical platforms. [61,62] Therefore, when the molecular junction is exposed to light, different conductance can be obtained and used as an indicator for monitoring the photoreaction process. The study of photochemical reactions by single-molecule electrical platforms provides opportunities to explore the mechanism of photoreactions and visualize photochemical processes at the single-molecule level, and further enrich their appli-cations in the fields of synthesis, catalysis, and functional devices.…”

Section: Photoinduced Reactionsmentioning

confidence: 99%

Recent Advances in Photochemical Reactions on Single‐Molecule Electrical Platforms

Zhu

Zhao

et al. 2022

Macromol. Rapid Commun.

View full text Add to dashboard Cite

The photochemical reaction is a very important type of chemical reaction. Visualizing and controlling photo-mediated reactions is a long-standing goal and challenge. In this regard, single-molecule electrical detection with label-free, real-time, and in situ characteristics has unique advantages in monitoring the dynamic process of photoreactions at the single-molecule level. In this review, a valuable summary of the latest process of single-molecule photochemical reactions based on single-molecule electrical platforms is provided. The single-molecule electrical detection platforms for monitoring photoreactions are displayed, including their fundamental principles, construction methods, and practical applications. The single-molecule studies of two different types of light-mediated reactions are summarized as below: i) photo-induced reactions, including reversible cyclization, conformational isomerization, and other photo-related reactions; ii) plasmon-mediated photoreactions, including reaction mechanisms and concrete examples, such as plasmon-induced photolysis of S-S/O-O bonds and tautomerization of porphycene. In addition, the prospects for future research directions and challenges in this field are also discussed.

show abstract

“…The hydrogen atom bonded to the latter can be removed either in basic solutions or by exposing it to oxygen. , Apart from the extensive studies in biology and electrochemistry, imidazole is winning growing attention as an aurophilic anchoring group in single-molecule junctions. It has been experimentally confirmed that both the nitrogen atoms in the imidazole moieties address reliable binding sites to form stable single-molecule junctions with gold electrodes. − Recently, we have reported that the Au–N bond is a donor–acceptor one when an imidazole molecule binds to the gold electrode via the pyridine-like nitrogen atom . In this case, the density of states (DOS) projected onto the imidazole molecule indicates that the LUMO is much closer to E F than the HOMO.…”

mentioning

confidence: 93%

In Situ Tuning of the Charge-Carrier Polarity in Imidazole-Linked Single-Molecule Junctions

Jiang

Wang

et al. 2021

J. Phys. Chem. Lett.

View full text Add to dashboard Cite

Manipulating the nature of the charge carriers at the single-molecule level is one of the major challenges of molecular electronics. Using first-principles quantum transport calculations, we have investigated the electronic transport properties of imidazole-linked singlemolecule junctions and identified the hydrogen atom bonded to the pyrrole-like nitrogen in imidazole as a switch to tune the polarity of the charge carriers. Our calculations show that the chemical nature of the imidazole anchors is dramatically altered by dehydrogenation, which changes the dominant charge carriers from electrons to holes. It is also revealed that upon dehydrogenation the interfacial Au−N bonds are modified from donor−acceptor-like to covalent, along with a significant promotion of the low-bias conductance and the junction stability. At variance with other traditional methods that always require drastic modifications of the junction structure, our findings provide a promising approach to tailor in situ the polarity of charge carriers in molecular electronic devices.

show abstract

In situ photoconductivity measurements of imidazole in optical fiber break-junctions

Abstract: We develop a method based on the mechanically controllable break junction technique to investigate the electron transport properties of single molecular junctions upon fiber waveguided light. In our strategy, a...

Cited by 26 publications

References 41 publications

Single-molecule optoelectronic devices: physical mechanism and beyond

Single-molecule optoelectronic devices: physical mechanism and beyond

Recent Advances in Photochemical Reactions on Single‐Molecule Electrical Platforms

In Situ Tuning of the Charge-Carrier Polarity in Imidazole-Linked Single-Molecule Junctions

Contact Info

Product

Resources

About