Electro-optical interfacial effects on a graphene/π-conjugated organic semiconductor hybrid system

Abstract

The influence of graphene and retinoic acid (RA) – a π-conjugated organic semiconductor – interface on their hybrid system is investigated. The physical properties of the interface are assessed via scanning probe microscopy, optical spectroscopy (photoluminescence and Raman) and ab initio calculations. The graphene/RA interaction induces the formation of a well-organized π-conjugated self-assembled monolayer (SAM) at the interface. Such structural organization leads to the high optical emission efficiency of the RA SAM, even at room temperature. Additionally, photo-assisted electrical force microscopy, photo-assisted scanning Kelvin probe microscopy and Raman spectroscopy indicate a RA-induced graphene doping and photo-charge generation. Finally, the optical excitation of the RA monolayer generates surface potential changes on the hybrid system. In summary, interface-induced organized structures atop 2D materials may have an important impact on both design and operation of π-conjugated nanomaterial-based hybrid systems.

Locally-enhanced optical properties in a hybrid organic/inorganic (coronene/MoS2) Van der Waals heterostructure

“…Consequently, any layered 2D material can be integrated with a variety of materials of different dimensionalities (0, 1, 2, or 3D) to form mixed-dimensional Van der Waals heterostructures [8,11]. The class of 0D materials, specifically organic molecules, can be assembled with on-demand geometries, making it possible to expand the classes of Van der Waals heterostructures by inducing and revealing relevant properties to layered 2D materials [22,23]. Coronene, C 24 H 12 , is a polycyclic aromatic hydrocarbon, homolog to benzene with six-fold aromatic symmetry and unique electronic structure (see figure 1(a)).…”

Green Preparation of Aqueous Graphene Dispersion and Study on Its Dispersion Stability

“…Graphene 1 is a 2D nanomaterial composed of carbon atoms that are compactly formed through the hybridization of and has the thickness of one carbon atom (0.334 nm) [ 1 , 2 ]. This material possesses excellent electrical [ 3 ], mechanical [ 4 ], thermal [ 5 ] and optical properties [ 6 ], and has become the key research object in the new generation of 2D nanomaterials. Graphene is widely used in the fields of energy storage [ 7 ], electronic devices [ 8 ], photocatalysis [ 9 ], composite materials [ 10 ], sensing [ 11 ], biomedicine [ 12 ] and national defense [ 13 ].…”

Organic Semiconductors for Photothermal Therapy and Photoacoustic Imaging

“…Organic conjugated semiconductor materials are easy to synthesize and to process. The materials have many advantages, such as their physical properties, low cytotoxicity, biodegradability, etc . Through modification of different substituents, the light‐absorbing area of the organic semiconductor can be tuned to the near infrared region.…”

“…The materials have many advantages, such as their physical properties, low cytotoxicity,b iodegradability,e tc. [23][24][25][26][27][28][29][30] Through modification of different substituents, the light-absorbing area of the organics emiconductor can be tuned to the near infraredr egion. It is possible to achieve higherc onversion efficiency of light and heat by adding a quencher to quench fluorescencea nd by other means.…”