Single Crossed Heterojunction Assembled with Quantum-Dot-Embedded Polyaniline Nanowires

Abstract

Nanoscale photodetectors are highly attractive for their potential applications in integrated optoelectronic devices. One-dimensional flexible nanowire-based photodetectors are especially important because low-dimensional nanostructures are fascinating platforms for manipulating electrons and photons at the subwavelength scale. Herein, we report an ultraviolet−visible photodetector based on a single crossed heterojunction assembled with quantum-dot-embedded polyaniline nanowires. The quantum-dot-embedded polyaniline nanowires are fabricated by a direct drawing method. Based on these inorganic−organic hybrid nanowires, room-temperature, high-performance, high-speed photodetectors are constructed. The fabricated photodetectors show an excellent light response in the wavelength region of 365 to 550 nm, with an external quantum efficiency of 10 5 %, a responsivity of 10 3 A/W, an on−off switching ratio of 10, and a short response/recovery time of 9 ms. These excellent performance characteristics are attributed to the abundant inorganic−organic interfaces and the intermediate radiative reabsorption process. The spectral response range can be readily tuned to a desired waveband by changing the emission wavelength of the quantum dots. This cross-heterojunction-based photodetector may have potential applications in integrated photonic and optoelectronic devices.

An investigation into the hybrid architecture of Mn–Co nanoferrites incorporated into a polyaniline matrix for photoresponse studies

“…70 The MCF-PANI nanohybrid photodetector device shows good responsivity compared to the already reported literature, as tabulated in Table 1. 10,42,71 After the photodetector's responsivity, detectivity is another parameter for analyzing the merits of the photodetector. The detectivity (D) of the photodetector is an important parameter for measuring; the suitability of the device for measuring weak signals 8,42,72 can also be defined by relation (9):…”

“…According to research, PANI and MCFs work together to generate a significant quantity of photoactivity. 19,[36][37][38][39][40][41][42][43][44] However, we present the first-ever photodetectors based on organic-inorganic MCF-PANI nanohybrids with a substantial responsivity of 22.69 A W À1 and a quick rise/ decay time of 0.7/0.8 s. All the chemicals were used as received without any further purification.…”

Photosensitive WS2/ZnO Nano-Heterostructure-Based Electrocatalysts for Hydrogen Evolution Reaction

“…Besides this, the synthesis of nanocomposites, nano-heterostructure, or nanohybrids has been proven to be more promising in the current scenario because of significant improvement in the HER activity by the highly controlled synthesis of catalysts with the desired proportion of materials and without disturbing the structural properties of host materials. , The use of various materials in the synthesis of nanocomposites, including nanostructures of transition-metal oxide (TMO) and noble metals, has shown enormous development in order to find the suitable catalyst with a low overpotential and high hydrogen yield. ,, Particularly, nanocomposites based on TMDCs, TMs, and TMOs have also emerged as high-performance catalysts ,, because of the simple and cost-effective synthesis and low hazard. Because of their controlled morphologies and atomically smaller size, they offer great catalytic activity even for their small amounts. ,, Additionally, the TMO/TMDC heterostructures/composites or TM/TMDCs heterostructures have shown great promise in the field of optoelectronics and self-driven photodetectors because of the formation of the type-II junction at the interface. − High-performance devices can be fabricated using these heterostructures as they show high and stable photo-absorption over a broad range of the solar spectrum from ultraviolet to near infrared. − These important optoelectronic ingredients of heterostructures can be utilized for the efficient photocatalysis. , Even, organic–inorganic nano-heterostructures can show a promising photoresponse owing to strong interface formation, which can be tuned by the proportion of constituents. − …”

Electrophoretic Deposition of MoSe2–MoOx Nanosheets for Enhanced Electrocatalytic Hydrogen Evolution Reaction

“…Of many non-noble-metal HER electrocatalysts, transition-metal dichalcogenides, − transition-metal oxides/hydroxides, − black phosphorous, carbon-based materials (i.e., carbon nanotubes, graphene, graphene oxide, and carbon nanostructures), conducting polymers such as polypyrrole and polyaniline, − and so forth stand out as the traditionally striking HER electrochemical catalysts. Two-dimensional transition-metal dichalcogenides (2D-TMDCs) including MoS 2 , − WS 2 , MoSe 2 , and WSe 2 have gained huge attention owing to their tunable catalytic activities.…”