Au–PbS core–shell nanorods for plasmon-enhanced near-infrared photodetection

Plasmon Coupled Colloidal Gold Nanorods for Near‐Infrared and Short‐Wave‐Infrared Broadband Photodetection

“…To compare with other colloidal nanoparticle based photodetectors, Table 1 summarizes the major characteristics of colloidal plasmonic metallic nanoparticles for visible, near‐IR, and/or SWIR photodetectors from previous applications and the current work. Despite the fact that colloidal plasmonic metallic nanoparticles, e.g., NPs [ 40–43 ] and NRs, [ 23,36,44 ] have been successfully applied previously for photodetection, in comparison to previous studies, the current results demonstrate a remarkable broadband detection covering the NIR‐SWIR spectrum from λ = 800 to 2000 nm, with a detection speed comparable or faster than many previous reports. Innovations on solution‐processed broadband photodetection devices in the NIR‐SWIR spectrum is particularly important because current technologies detecting this spectrum window suffer from high cost and often demand highly toxic heavy metal elements.…”

“…Supporting Information is available from the Wiley Online Library or from the author. Ag-NPs/CdSe-ZnS-QDs 2.5 × 10 −6 A W −1 @ 440 nm -400-600 [40] Au-NRs/ZnO-nanowire -0.25 s 650-850 [23] Au-NPs/TiO 2 0.5 mA W −1 @ 600 nm 1.5 s 400-900 [41] SiO 2 -AuNRs/SLG-InP 0.14 A W −1 @ 980 nm 441 ns 300-1200 [44] Ag-PbS core-shell NPs 26.1 A W −1 @ 980 nm 0.17 s 370-1064 [42] Au-PbS core-shell NPs 18.5 A W −1 @ 980 nm 0.32 s 405-1064 [43] Au-NRs/NTC-thermistor -2.5 s 1000-1800 [36] Au-NRs/Pt-micropattern 13 mA W −1 @ 1000 nm 180 µs 800-2000 This work…”

Gold Nanorods: The Most Versatile Plasmonic Nanoparticles

“…In the subsequent step, cation exchange can be performed to give various metal sulfide/selenide shells. This aqueous cation exchange approach has become very popular in the synthesis of many types of core@shell structures, such as (Au NR)@CdS (Figure m), (Au NR)@ZnS, and (Au NR)@PbS. ,− The synthesized metal sulfide/selenide shells have an intimate interfacial contact with the Au NR core, high shell crystallinity, and good structural controllability . Consecutive multistep cation exchange can be carried out to create core@multishell heterostructures or core@(multicomponent shell) heterostructures. , …”

Long-Term Stable Near-Infrared–Short-Wave-Infrared Photodetector Driven by the Photothermal Effect of Polypyrrole Nanostructures

“…A strong photoresponsivity (in Ω/W and A/W) was measured, and the maximum values reached 7.5 × 10 6 Ω/W and 1.3 A/W (Figure d). Detectivity ( D *), as another key parameter to evaluate the performance of PDs, was also calculated by following some reference equations from previous studies. , The maximum D * for our PPy-NPs/Pt device can reach 1.1 × 10 11 Jones, which is comparable with some InGaAs PDs ( D * = 1 × 10 10 –1 × 10 13 Jones) and nanostructured PDs ( D * = ∼1 × 10 8 –1 × 10 14 Jones). − Compared with commercial PDs , and some NP-based ones, ,− this PPy-NPs/Pt hybrid PD is competitive in the photodetection range, responsivity, and response time, as summarized in Table . Notably, PPy-NPs/Pt hybrid PD reveals both faster photoresponse and slightly larger photoresponsivity than PPy-NPs/thermistor PD, although the size of the Pt pattern is much smaller than that of the NTC thermistor.…”

“…44,45 The maximum D* for our PPy-NPs/Pt device can reach 1.1*10 11 Jones, which is comparable with some InGaAs PDs (D* = 1*10 10 -1*10 13 Jones) and nanostructured PDs (D* = ~ 1*10 8 -1*10 14 Jones). [46][47][48] Compared with commercial PDs 46,48 and some nanoparticle-based ones 10,[49][50][51][52] , this PPy-NPs/Pt hybrid PD is competitive in photodetection range, responsivity and response time, as summarized in Table 1. Notably, PPy-NPs/Pt hybrid PD reveals both faster photoresponse and slightly larger photoresponsivity than PPy-NPs/thermistor PD, although the size of Pt pattern is much smaller than that of NTC thermistor.…”