Graphene(rGO)based hybrid materials exhibiting electrical conductivity and spin crossover(SCO)behavior are reported.The non-conductive[Fe(qnal)_(2)]_(n)GO(1·GO)and[Fe(qsal)_(2)]_(n)GO(2·GO)hybrids have been ...Graphene(rGO)based hybrid materials exhibiting electrical conductivity and spin crossover(SCO)behavior are reported.The non-conductive[Fe(qnal)_(2)]_(n)GO(1·GO)and[Fe(qsal)_(2)]_(n)GO(2·GO)hybrids have been prepared by employing the electrostatic interaction between the negatively charged graphene oxide(GO)nanosheet and the respective iron(III)complex cations in[Fe(qnal)_(2)]^(+)Cl^(−)and[Fe(qsal)_(2)]^(+)Cl^(−).展开更多
Acetaldehyde gas sensing using hybrids of reduced graphene oxide(rGO)and transition metal elements,rGO-M(M=oxide/hydroxide of Mn,Fe,Co and Ni)has been investigated.Thin films of GO,rGO and rGO-M on conductive glass we...Acetaldehyde gas sensing using hybrids of reduced graphene oxide(rGO)and transition metal elements,rGO-M(M=oxide/hydroxide of Mn,Fe,Co and Ni)has been investigated.Thin films of GO,rGO and rGO-M on conductive glass were deposited through simple and affordable techniques and characterized using Raman spectroscopy,powder X-ray diffraction patterns,field emission scanning electron microscopy and electrical conductivity measurements.Concentration dependent resistances during the oxidation of acetaldehyde gas in air(10 to 50%)were investigated by using a sensing probe devised from rGO,GO-M and the rGO-M hybrids,of which rGO-Ni exhibited the maximum sensitivity.In rGO-Ni,in combination with rGO the NiOOH precursor can capture electrons(generated from acetaldehyde oxidation)through the holes,while indicating rGO-Ni to be a p-type semiconductor.This report implies the possibility of developing inexpensive graphene based p-type semiconductors for sensing other gases as well.展开更多
Spin crossover in iron(Ⅱ)and iron(Ⅲ)complexes continues to receive much attention for the construction of molecular devices due to the presence of functionalities arising from their spin state switching behav ior.No...Spin crossover in iron(Ⅱ)and iron(Ⅲ)complexes continues to receive much attention for the construction of molecular devices due to the presence of functionalities arising from their spin state switching behav ior.Notably,some such compounds are associated with a light-induced excited spin-state trapping(LIESST)effect,which is responsible for the optical switching of their spin states.However,as opposed to iron(Ⅱ)complexes,reports of iron(Ⅲ)complexes that exhibit a LIESST effect are somewhat limited.This review presents an overview of the reported examples of SCO iron(Ⅲ)systems that display LIESST effects.展开更多
基金supported by KAKENHI Grant-in-Aid for Scientific Research(B)26288026Grant-in-Aid for Scientific Research on Innovative Areas 2506[Science of Atomic Layers].
文摘Graphene(rGO)based hybrid materials exhibiting electrical conductivity and spin crossover(SCO)behavior are reported.The non-conductive[Fe(qnal)_(2)]_(n)GO(1·GO)and[Fe(qsal)_(2)]_(n)GO(2·GO)hybrids have been prepared by employing the electrostatic interaction between the negatively charged graphene oxide(GO)nanosheet and the respective iron(III)complex cations in[Fe(qnal)_(2)]^(+)Cl^(−)and[Fe(qsal)_(2)]^(+)Cl^(−).
基金supported by Innovative Areas“Coordination Programming”(area 2107)from the MEXT,Japan.
文摘Acetaldehyde gas sensing using hybrids of reduced graphene oxide(rGO)and transition metal elements,rGO-M(M=oxide/hydroxide of Mn,Fe,Co and Ni)has been investigated.Thin films of GO,rGO and rGO-M on conductive glass were deposited through simple and affordable techniques and characterized using Raman spectroscopy,powder X-ray diffraction patterns,field emission scanning electron microscopy and electrical conductivity measurements.Concentration dependent resistances during the oxidation of acetaldehyde gas in air(10 to 50%)were investigated by using a sensing probe devised from rGO,GO-M and the rGO-M hybrids,of which rGO-Ni exhibited the maximum sensitivity.In rGO-Ni,in combination with rGO the NiOOH precursor can capture electrons(generated from acetaldehyde oxidation)through the holes,while indicating rGO-Ni to be a p-type semiconductor.This report implies the possibility of developing inexpensive graphene based p-type semiconductors for sensing other gases as well.
基金supported by KAKENHI Grant-in-Aid for Scientific Research(Grant No.JP17H01200(S.H.),JP18K14245(R.O.)).
文摘Spin crossover in iron(Ⅱ)and iron(Ⅲ)complexes continues to receive much attention for the construction of molecular devices due to the presence of functionalities arising from their spin state switching behav ior.Notably,some such compounds are associated with a light-induced excited spin-state trapping(LIESST)effect,which is responsible for the optical switching of their spin states.However,as opposed to iron(Ⅱ)complexes,reports of iron(Ⅲ)complexes that exhibit a LIESST effect are somewhat limited.This review presents an overview of the reported examples of SCO iron(Ⅲ)systems that display LIESST effects.
