Combining with electrospray ionization(ESI)mass spectrometry,infrared photodissociation(IRPD)spectroscopy is a powerful method to study structures of cluster ions in the gas phase.In this paper,infrared photodissociat...Combining with electrospray ionization(ESI)mass spectrometry,infrared photodissociation(IRPD)spectroscopy is a powerful method to study structures of cluster ions in the gas phase.In this paper,infrared photodissociation spectrum of Pro_4H~+in the range of 2700–3600 cm 1was obtained experimentally.Both theoretically predicted spectra of the two most stable isomers of Pro4^(-1)and Pro4^(-2)obtained at the level of M062X/6-31+G(d,p)are in good consistent with the experimental results.The two isomers have similar structures and close energies.Both of them only consist of zwitterionic units,indicating the strong salt-bridged interactions inside the clusters.And the calculated collision cross section(ccs)of Pro4-1 is found to be very close to the experimental result previously reported.展开更多
Threonine-substituted serine octamer ions were generated by electrospray ionization（ESI） and investigated by mass spectrometry and infrared photodissociation（IRPD） spectroscopy. IRPD spectra of[L-Ser_7＋ L/D-Thr_1...Threonine-substituted serine octamer ions were generated by electrospray ionization（ESI） and investigated by mass spectrometry and infrared photodissociation（IRPD） spectroscopy. IRPD spectra of[L-Ser_7＋ L/D-Thr_1]H~＋and [L-Ser_6＋ L/D-Thr_2]H~＋were obtained in the range of 2700–3600 cm^（-1）. Chiral differentiation was achieved by comparing their IRPD spectra. The main difference located in the range of 3300–3500 cm^（-1）. And the results indicate the substitution of L-Ser by D-Thr could weaken the intermolecular H-bonds and loosen the original structures of serine octamers.展开更多
The surging demand and adoption of infrared photodetectors(IRPDs)in sectors of imaging,mobile,healthcare,automobiles,and optical communication are hindered by the prohibitive costs of traditional IRPD materials such a...The surging demand and adoption of infrared photodetectors(IRPDs)in sectors of imaging,mobile,healthcare,automobiles,and optical communication are hindered by the prohibitive costs of traditional IRPD materials such as InGaAs and HgCdTe.Quantum dots(QDs),especially lead chalcogenide(PbS)QDs,represent the next-generation lowbandgap semiconductors for near-infrared(NIR)detection due to their high optical absorption coefficient,tunable bandgap,low fabrication costs,and device compatibility.Innovative techniques such as ligand exchange processes have been proposed to boost the performance of PbS QDs photodetectors,mostly using short ligands like 1,2-ethanedithiol(EDT)and tetrabutylammonium iodide(TBAI).Our study explores the use of long-chain dithiol ligands to enhance the responsivity of PbS QDs/InGaZnO phototransistors.Long-chain dithiol ligands are found to suppress horizontal electron transport/leakage and electron trapping,which is beneficial for responsivity.Utilizing a novel ligand-exchange technique with 1,10-decanedithiol(DDT),we develop high-performance hybrid phototransistors with detectivity exceeding 10^(14) Jones.Based on these phototransistors,we demonstrate image communication through a NIR optical communication system.The long-ligand PbS QDs/InGaZnO hybrid phototransistor demonstrates significant potential for NIR low-dose imaging and optical communication,particularly in scenarios requiring the detection of weak light signals at low frequencies.展开更多
基金Financial support from the National Natural Science Foundation of China(Nos.21172121,21475065)the Fundamental Research Funds for the Central Universities
文摘Combining with electrospray ionization(ESI)mass spectrometry,infrared photodissociation(IRPD)spectroscopy is a powerful method to study structures of cluster ions in the gas phase.In this paper,infrared photodissociation spectrum of Pro_4H~+in the range of 2700–3600 cm 1was obtained experimentally.Both theoretically predicted spectra of the two most stable isomers of Pro4^(-1)and Pro4^(-2)obtained at the level of M062X/6-31+G(d,p)are in good consistent with the experimental results.The two isomers have similar structures and close energies.Both of them only consist of zwitterionic units,indicating the strong salt-bridged interactions inside the clusters.And the calculated collision cross section(ccs)of Pro4-1 is found to be very close to the experimental result previously reported.
基金Financial support from the National Natural Science Foundation of China(No.21475065)
文摘Threonine-substituted serine octamer ions were generated by electrospray ionization（ESI） and investigated by mass spectrometry and infrared photodissociation（IRPD） spectroscopy. IRPD spectra of[L-Ser_7＋ L/D-Thr_1]H~＋and [L-Ser_6＋ L/D-Thr_2]H~＋were obtained in the range of 2700–3600 cm^（-1）. Chiral differentiation was achieved by comparing their IRPD spectra. The main difference located in the range of 3300–3500 cm^（-1）. And the results indicate the substitution of L-Ser by D-Thr could weaken the intermolecular H-bonds and loosen the original structures of serine octamers.
基金the EPSRC SWIMS(EP/V039717/1)Royal Society(RGS\R1\221009 and IEC\NSFC\211201)+4 种基金Leverhulme Trust(RPG-6062022-263)Sêr Cymru programme-Enhancing Competitiveness Equipment Awards 2022-23(MA/VG/2715/22-PN66)the financial support from National Natural Science Foundation of China(NSFC)Grant No.62105214the financial support from National Natural Science Foundation of China(NSFC)No.61974006Shenzhen Science and Technology Innovation Committee(KJZD20230923113759002 and GJHZ20240218113959009).
文摘The surging demand and adoption of infrared photodetectors(IRPDs)in sectors of imaging,mobile,healthcare,automobiles,and optical communication are hindered by the prohibitive costs of traditional IRPD materials such as InGaAs and HgCdTe.Quantum dots(QDs),especially lead chalcogenide(PbS)QDs,represent the next-generation lowbandgap semiconductors for near-infrared(NIR)detection due to their high optical absorption coefficient,tunable bandgap,low fabrication costs,and device compatibility.Innovative techniques such as ligand exchange processes have been proposed to boost the performance of PbS QDs photodetectors,mostly using short ligands like 1,2-ethanedithiol(EDT)and tetrabutylammonium iodide(TBAI).Our study explores the use of long-chain dithiol ligands to enhance the responsivity of PbS QDs/InGaZnO phototransistors.Long-chain dithiol ligands are found to suppress horizontal electron transport/leakage and electron trapping,which is beneficial for responsivity.Utilizing a novel ligand-exchange technique with 1,10-decanedithiol(DDT),we develop high-performance hybrid phototransistors with detectivity exceeding 10^(14) Jones.Based on these phototransistors,we demonstrate image communication through a NIR optical communication system.The long-ligand PbS QDs/InGaZnO hybrid phototransistor demonstrates significant potential for NIR low-dose imaging and optical communication,particularly in scenarios requiring the detection of weak light signals at low frequencies.
