Amorphous Mn₃O₄ Nanocages with High‐Efficiency Charge Transfer for Enhancing Electro‐Optic Properties of Liquid Crystals

Abstract

Improving electro‐optic properties is essential for fabricating high‐quality liquid crystal displays. Herein, by doping amorphous Mn3O4 octahedral nanocages (a‐Mn3O4 ONCs) into a nematic liquid crystal (NLC) matrix E7, outstanding electro‐optic properties of the blend are successfully obtained. At a doping concentration of 0.03 wt%, the maximum decreases of threshold voltage (Vth) and saturation voltage (Vsat) are 34% and 31%, respectively, and the increase of contrast (Con) is 160%. This remarkable electro‐optic activity can be attributed to high‐efficiency charge transfer within the a‐Mn3O4 ONCs NLC system, caused by metastable electronic states of a‐Mn3O4 ONCs. To the best of our knowledge, such remarkable decreased electro‐optic activity is observed for the first time from doping amorphous semiconductors, which could provide a new pathway to develop excellent energy‐saving amorphous materials and improve their potential applications in electro‐optical devices.

Multidimensional Dual-Carbon Skeleton Network Confined MnOx Anode Boosting High-Performance Lithium-Ion Hybrid Capacitors

“…The measurement results (Figure 2h,i) show that the nanoclusters contain two interlayer spacings of 0.223 and 0.248 nm, corresponding to the MnO(200) and Mn 3 O 4 (211) crystal planes, respectively. 35,36 This fact confirms the coexistence of MnO and Mn 3 O 4 in MnO x @C-R and echoes the conclusion of XRD characterization. Although the macroscopic distribution of MnO x @C is similar to that of MnO x @C-R, the nanoclusters in MnO x @C are almost all Mn 3 O 4 , which reveals the fact that Mn 3 O 4 is dominant in MnO x @C (shown in Figure S7d).…”

Wet Chemical Synthesis of Amorphous Nanomaterials with Well-Defined Morphologies

“…38−41 We calcined the amorphous metal hydroxide nanocages to obtain corresponding amorphous metal oxide nanocages. 42,43 By further optimizing the reaction conditions, we prepared binary amorphous nanocages (Ni−Zn hydr(oxy)oxide, Ni−Co hydr(oxy)oxide), etc.) 44,45 and ternary metal hydroxide (Cu−Ni−Fe hydr(oxy)oxide, etc.)…”

“…the reasonable enhancement mechanisms are highlighted. 18,[41][42][43]55,56 We used amorphous ZnO nanocages as a SERS substrate and observed a SERS enhancement factor (EF) as high as 6.62 × 10. 5,42 X-ray absorption near-edge structure (XANES) characterization and first-principles density functional theory (DFT) calculations showed that the amorphous structure with a low coordination number and the abundant oxygen defects in the ZnO nanocages had a higher electronic density of states and a narrower energy gap, resulting in a higher SERS activity than the corresponding crystalline compound.…”

“…18 DFT calculations showed that the specific orientation characteristics and disordered structure of 1D amorphous nanomaterials resulted in excellent electron and photon transmission characteristics and abundant S defects, which can greatly improve luminous efficiency and realize the luminous intensity of liquid crystal materials. 18,43…”

“…This shows that when the template starts to be etched, the time required for the precipitation of the metal hydroxide is very short, resulting in amorphous nanocages. Through this method, we synthesized a large number of unary amorphous metal hydroxide nanocages, such as Mn­(OH) 2 /MnO­(OH), Fe­(OH) 3 , Co­(OH) 2 , Ni­(OH) 2 , Zn­(OH) 2 , and Pb­(OH) 2 nanocages. − We calcined the amorphous metal hydroxide nanocages to obtain corresponding amorphous metal oxide nanocages. , By further optimizing the reaction conditions, we prepared binary amorphous nanocages (Ni–Zn hydr­(oxy)­oxide, Ni–Co hydr­(oxy)­oxide), etc. ) , and ternary metal hydroxide (Cu–Ni–Fe hydr­(oxy)­oxide, etc.…”