Mixed valent oxides play a very important role in catalysis,as well as in gas sensing,biomedical engineering and electrochemistry.Because many chemical and physical processes occur on heterogeneous surfaces,the surfac...Mixed valent oxides play a very important role in catalysis,as well as in gas sensing,biomedical engineering and electrochemistry.Because many chemical and physical processes occur on heterogeneous surfaces,the surface atomic structure becomes a critical factor affecting the properties of solid inorganic materials.Therefore,shape controlled synthesis,which can promise selective exposure of specific crystallographic planes with varied Miller indices for nano-and microcrystallites of metal oxides during the synthetic process,has turned into an important research topic in multidisciplinary fields.In this review,we summarize recent progress in the solution based shape controlled synthesis of several typical mixed valent oxide nano-and microcrystallites,including TiO_(2),CeO_(2),FeO_(x),Cu2O,CoO_(x),MnO_(x),WO_(x),and MoO_(3).The relationship between the surface structure of some mixed valent oxide nanomaterials and their chemical reactivity in heterogeneous catalysis and photocatalysis is also concisely discussed.展开更多
Broadband near-infrared (NIR) light sources hold promise forsome important NIR spectroscopy applications such as nightvision, plant growths, optical communications, remote sensing,biomedical imaging and other noninvas...Broadband near-infrared (NIR) light sources hold promise forsome important NIR spectroscopy applications such as nightvision, plant growths, optical communications, remote sensing,biomedical imaging and other noninvasive and nondestructivedetections [1–4]. Recently, the phosphors-converted NIR lightemittingdiodes (LEDs) based on “blue LED chips + broadbandNIR phosphors” are widely developed for next-generation costeffectiveNIR light sources. In this respect, the performance ofNIR phosphors directly determines the overall quality of phosphors-converted NIR LEDs. Therefore, the development ofefficient, blue LED-excitable, broadband NIR phosphors ishighly demanded. Current research works on broadband NIRphosphors mainly focus on Cr^(3+) and Eu^(2+) activated inorganiccompounds, but Cr3+-activated NIR phosphors might showpotential carcinogenic risk owing to the presence of Cr6+ byproduct,while Eu2+-activated NIR phosphors still suffer fromlow luminescence efficiency [5]. As a result, new alternativeenvironmentally-friendly broadband NIR phosphors areurgently needed. In recent years, lead-free metal halides havearoused widespread interest for lighting and displays because oftheir fascinating visible emissions [6–8];however, their NIRluminescence has not received enough attention. Moreover, thecurrently developed NIR-emitting lead-free metal halides exhibitsome disadvantages including low emission efficiency and theirlimited excitation wavelengths in the ultraviolet (UV) range.Until now, finding an efficient, blue LED-pumped, broadbandNIR-emitting lead-free metal halide remains a formidablechallenge.展开更多
基金supported by the National Science Foundation of China(NSFC)(Grant No.21025101,21271011,21573005,and 21321001)financial aid of China National Funds for Distinguished Young Scientists from the NSFC.
文摘Mixed valent oxides play a very important role in catalysis,as well as in gas sensing,biomedical engineering and electrochemistry.Because many chemical and physical processes occur on heterogeneous surfaces,the surface atomic structure becomes a critical factor affecting the properties of solid inorganic materials.Therefore,shape controlled synthesis,which can promise selective exposure of specific crystallographic planes with varied Miller indices for nano-and microcrystallites of metal oxides during the synthetic process,has turned into an important research topic in multidisciplinary fields.In this review,we summarize recent progress in the solution based shape controlled synthesis of several typical mixed valent oxide nano-and microcrystallites,including TiO_(2),CeO_(2),FeO_(x),Cu2O,CoO_(x),MnO_(x),WO_(x),and MoO_(3).The relationship between the surface structure of some mixed valent oxide nanomaterials and their chemical reactivity in heterogeneous catalysis and photocatalysis is also concisely discussed.
文摘Broadband near-infrared (NIR) light sources hold promise forsome important NIR spectroscopy applications such as nightvision, plant growths, optical communications, remote sensing,biomedical imaging and other noninvasive and nondestructivedetections [1–4]. Recently, the phosphors-converted NIR lightemittingdiodes (LEDs) based on “blue LED chips + broadbandNIR phosphors” are widely developed for next-generation costeffectiveNIR light sources. In this respect, the performance ofNIR phosphors directly determines the overall quality of phosphors-converted NIR LEDs. Therefore, the development ofefficient, blue LED-excitable, broadband NIR phosphors ishighly demanded. Current research works on broadband NIRphosphors mainly focus on Cr^(3+) and Eu^(2+) activated inorganiccompounds, but Cr3+-activated NIR phosphors might showpotential carcinogenic risk owing to the presence of Cr6+ byproduct,while Eu2+-activated NIR phosphors still suffer fromlow luminescence efficiency [5]. As a result, new alternativeenvironmentally-friendly broadband NIR phosphors areurgently needed. In recent years, lead-free metal halides havearoused widespread interest for lighting and displays because oftheir fascinating visible emissions [6–8];however, their NIRluminescence has not received enough attention. Moreover, thecurrently developed NIR-emitting lead-free metal halides exhibitsome disadvantages including low emission efficiency and theirlimited excitation wavelengths in the ultraviolet (UV) range.Until now, finding an efficient, blue LED-pumped, broadbandNIR-emitting lead-free metal halide remains a formidablechallenge.
