Bulk scintillators that are with high density, low cost, and fine pulse-height energy spectral resolution, and are non-hygroscopic and user friendly, are desired for high-energy gamma-ray spectroscopy application. Recently, low-cost solution-processed perovskite nanoscintillators have been demonstrated with outstanding performances for indirect low-energy X-ray detection; however, the stability and thickness are not suitable for high-energy gamma-ray detection. Here, we report scintillation performances of a low-cost solution-processed bulk 0D
Cs
3
Cu
2
I
5
single crystal. The self-trapped exciton emission results in a large Stokes shift (109 nm) that is reabsorption free. A broad X-ray excited emission matches well with the sensitivity of a silicon photodiode. The unique
Cs
+
surrounded isolated
[
Cu
2
I
5
]
3
−
cluster scintillator provides ultra-stability in air and strong radiation hardness under high-dose gamma-ray exposure from a 60Co source. This solution-processed
Cs
3
Cu
2
I
5
scintillator is expected with low-cost and has detection performances comparable to commercial alkali-halide scintillator products.
Interfacial modification of organolead halide perovskites (OHPs) has shown to be a promising strategy to improve the quality of OHPs film. In this work, a bipolar amino acid molecule, L‐Leucine (LL), have been introduced to the anti‐solvent solution to induce the formation methylammonium lead triiodide (MAPbI3) perovskite films. The morphology, crystal structure, and optoelectronic property of perovskite films are systematically studied, where the bipolar LL plays a key role. By employing the LL‐modified perovskite film, the perovskite solar cells (PSCs) are well prepared. Consequently, a 18.2% efficiency was obtained from the champion device, which showed a significant improvement compared to the controlled device with a PCE of 16.1%. Our results demonstrate the crucial role of bipolar feature of interfacial modification agent on the charge transfer at the interface, and provide important interfacial modification concept on efficient PSCs. Moreover, significantly improved stability can be observed from the LL modified devices, benefiting from the effectively trap‐passivation.
The absorption and scattering frequencies of surface
plasmon resonance
can be selectively adjusted by changing the morphology, size, structure,
arrangement, and gap between noble metal nanoparticles so that the
local electromagnetic field on the substrate surface can be further
enhanced. This change will promote and popularize surface-enhanced
Raman spectroscopy. This paper reports the research results and improvement
scheme of surface enhanced Raman scattering (SERS) activity of silver-coated
gold nanocubed/organism (Au@Ag/CW NCs) prepared by three-phase self-assembly.
In the experiment, the uppermost oil phase in the three-phase self-assembly
process was optimized as ethanol and n-hexane solution
containing a specific concentration of a probe molecule rhodamine
6G or aspartame. The probe molecules were directly self-assembled
on the surface of the composite substrate to avoid the possible loss
and pollution during immersion and preservation and achieve the purpose
of rapid detection. The results show that the Au@Ag/CW NC array substrate
is a periodic cubic ring structure. The sensitivity, uniformity, reproducibility,
and stability of composite Au@Ag/CW NC array substrates are verified
by comparing the Raman activities of various substrates. The feasibility
of using the substrate to realize rapid SERS detection, compared with
the advantages and disadvantages of the traditional soaking method,
proved that the prepared substrate and improvement direction have
excellent potential for application and development prospects in the
field of rapid food additive detection.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.