Dielectrophoretic-Assembled Single and Parallel-Aligned Ag Nanowire–ZnO-Branched Nanorod Heteronanowire Ultraviolet Photodetectors

Abstract

The branched hierarchical heteronanowires have been widely studied for optoelectronics application because of their unique electronic and photonic performances. Here, we successfully synthesized Ag nanowire-ZnO-branched nanorod heteronanowires based on an improved hydrothermal method. Then we fabricated single heteronanowire across a Au electrode pair with different gap widths and parallel-aligned heteronanowires on a Au interdigitated electrode with a dielectrophoresis method, indicating the flexibility and operability of the dielectrophoresis assembly method. Increased photocurrent and shortened response time could be obtained by air-annealing and Ar-plasma post-treatments. A large responsivity of 2.5 A W and a linear dynamic range of 74 dB could be obtained, indicating stable responsivity for both weak and strong illumination. The excellent photoresponse performance is attributed to the structure superiority of heteronanowires. The proposed strategy of dielectrophoresis-assembled heteronanowires provides a new opportunity to design and fabricate hierarchical nanostructure photodetectors.

Ultrahigh Responsivity UV Photodetector Based on Cu Nanostructure/ZnO QD Hybrid Architectures

“…Consequently, the PD2 exhibited an outstanding performance among Cu NS/ZnO QD hybrid architecture photodetectors under an identical condition, and an excellent reproducibility and stability was also witnessed with the photodetectors within 50 cycles and 7 d as shown in Figure S12 (Supporting Information). Meanwhile, many efforts have been endeavored to boost the performance of ZnO photodetectors [33][34][35][52][53][54][55][56][57][58][59][60][61] as summarized in Table 5, and obviously, the performance of the PD2 was predominantly superior to the ZnO photodetectors. Specifically, various nanocomposites were adapted to ZnO NSs based UV photodetectors: ZnO NWs/ graphene foams can guarantee a high I on of ≈1 mA, [57] and ZnS/ZnO heterostructures exhibited a relatively high R of 94.5 A W −1 .…”

“…Ag NWs/ZnO branched nanorods [59] 365 nm, 5 mW cm −2 5 250 2.5 × 10 3 -1 -ZnS/ZnO [60] 350 nm, 1.32 mW cm −2 5 18 9.45 × 10 4 --33 471…”

Femtosecond laser-induced non-thermal welding for a single Cu nanowire glucose sensor

“…Nano-manipulation to enable controlled assembly of nanoscale building blocks is essential for nanomanufacturing. To fabricate single nanowire devices, several methods have been established for manipulating NWs, including electric eldassisted alignment, [14][15][16][17] ow-assisted alignment, 18 the blow bubble method, 19 contact printing, 20 direct growth of NW devices, 21 the Langmuir-Blodgett technique, 22 optical tweezers, 23,24 optoelectrical tweezers 25 and micro-robots. 26,27 Compared with other methods, the electric eld-assisted alignment 28 has been widely applied to control different types of NWs, such as semiconductors, metals, and carbon, normally by dielectrophoresis (DEP) force.…”

Stable Electrochemical Measurements of Platinum Screen-Printed Electrodes Modified with Vertical ZnO Nanorods for Bacterial Detection

“…Recently, ZnO nanorods (NRs) have also revealed advantages in biosensors, such as good reproducibility, high sensitivity, and cost-effective fabrication techniques as well as portability [15]. There are several ways reported to deposit ZnO nanorods on substrates such as dielectrophoresis [16], focused-ion-beam [17], or chemical vapour deposition [18]. This material can be easily synthesized in the nanorod shape by the fast, low temperature, and inexpensive hydrothermal route [19,20].…”