Optical Recording Performance of Azo Nickel Chelate Thin Film

1IntroduCtionAndyeshavebeenwidelystudiedasmaterialsforreverwhleoPticalstorae,forholographasanexamPle,inwhichisomerizatiOnofazomoeculesekistSbetWeentransandcisform['~'].HOWever,therearetwomainproblemswhichhavelindtedtheirfurtherpracticalaPplications.oneisthatthesbetransformationspeedbetweenisomers,vawingfroInseveralhacrosecondstoseveralseconds,can'tmeetthehighspeeddemandofdatastorage.Theotheristhattheunstablecisstateofazodyesthermallyre-isomerizestothemorestabletransisomerverycommnly.Aithou…     

一种超支化偶氮聚氨酯的合成及其光致变色性能

以偶氮间苯二酚磺酸和4,4^/-二苯甲烷二异氰酸酯为原料,利用偶氮间苯二酚磺酸的羟基、磺酸基与4,4^/-二苯甲烷二异氰酸酯分子中的异氰酸酯基,通过A₂+B₃方法缩聚合成超支化偶氮聚氨酯,利用合成聚合物分子外围的羟基与丁二酸酐/偏苯三酸酐反应,改善超支化偶氮聚氨酯的溶解性.并通过IR、TG等对目标聚合物进行表征.采用UV-Vis光谱研究了合成偶氮聚合物的光致变色特性.结果表明:目标偶氮聚氨酯π→π^*跃迁最大吸收峰为425 nm,偏苯三酸酐改性超支化偶氮聚氨酯与超支化偶氮聚氨酯π→π^*跃迁最大吸收峰基本一致,丁二酸酐改性超支化偶氮聚氨酯偶氮基团π→π^*跃迁最大吸收峰由425 nm红移至501 nm.     

偶氮染料掺杂高分子薄膜的光谱和光存储性质研究

利用旋涂法,制备了以二乙基胺基〖Ｎ（ＣＨ２ＣＨ３）２〗作为推电子基因、以具有强电负性的羧基（ＣＯＯＨ）作为拉电子基团的推－拉型偶氮染料掺杂的高分子（ＰＭＭＡ）薄膜。在室温下测试了该偶氮染料在溶液和薄膜态的吸收光谱、薄膜态的反射光谱和透过光,发现该薄膜在４００～５５０ｎｍ波长范围内具有强的吸收。在５１４．５ｎｍ光盘静脉测试仪上测试了膜片的静脉光存储性能,结果表明,用低功率Ａｒ＾＋激光（５１４．５ｎ     

改性耐晒蓝与铜离子形成的配合物吸光性质研究

在乙醇与水体积比为1∶1的混合溶剂中将工业级染料耐晒蓝(FRL)用重结晶法提纯,提纯后的FRL用亚硝酸钠(NaNO₂)进行重氮化,再与邻菲咯啉(Phen)进行偶合,得到改性耐晒蓝(FRLP)。FRLP与Cu2+反应形成配合物。利用退色分光光度法结合等摩尔连续变化法测定Cu2+与FRLP的组成,在pH 6～9的条件下得到1∶2的配合物。在pH 8.8的B-R缓冲溶液中测得该配合物的摩尔吸光系数ε_{590 nm}为9.5×104 L·mol-1·cm-1,表观稳定常数K_表为5.12×1012。研究了该配合物在紫外区的谱学性质,发现在200～305 nm区域内其水溶液对紫外光具有很强的吸收作用。将该配合物与聚乙烯醇共混制成偏光膜,对紫外光同样具有较强的吸收作用,在可见光区最大吸收波长处与光轴平行时单片膜的透过率为45%～50％,两片垂直放置的膜在200～325 nm范围内透过率为零,325～400 nm范围内的平均透过率约10%。     

Ni2+掺杂近化学计量比铌酸锂晶体的生长及光谱特性

以K2O为助熔剂,在较大的固液界面温度梯度条件下,应用坩埚下降法技术生长了初始Ni2 掺杂摩尔分数为0.5%的近化学计量比铌酸锂晶体。测定了晶体的吸收光谱,观测到由Ni2 离子在八面体中3A2g(F)→3T1g(P)、3A2g(F)→3T1g(F)、3A2g(F)→3T2g(F)能级的正常自旋允许跃迁所产生的381 nm,733 nm,1280 nm吸收峰和3A2g(F)→1T2g(D)和3A2g(F)→1E(D)能级的自旋禁戒跃迁产生的430 nm与840 nm吸收峰。从晶体紫外吸收边的位置初步估算其摩尔分数比x(Li )/x(Nb5 )为0.981。根据晶体分裂场理论和吸收光谱,计算了Ni2 在该铌酸锂晶体中的晶格场分裂参量Dq=781 cm-1、Racah参量B=1096 cm-1与C=4353 cm-1。研究了在不同激发波长下晶体在可见光波段的荧光特征,观察到500~630 nm的绿色与800~850 nm的红色荧光发射带,它们归结为1T2g(D)→3A2g(F)与1T2g(D)→3T2g(F)的能级跃迁所致。     

A simulated colorimetric INHIBIT logic gate based on 2-(2-thiazolylazo)-p-cresol

ABSTRACT

2-(2-Thiazolylazo)-p-cresol system achieved distinct optical output signal by controlling pH and mercury-ion complexation. The 2-(2-thiazolylazo)-p-cresol with mercury ion existed as an equilibrium mixture of both an azo and hydrazone tautomeric forms at 372 and 425?nm, respectively, along with the appearance of a new absorption peak at 610?nm (visual color of green), which was attributed to the binding of mercury ion with 2-(2-thiazolylazo)-p-cresol. Furthermore, the addition of proton led to the perturbation of the conjugation between 2-(2-thiazolylazo)-p-cresol and mercury ion and absence of absorption at 610?nm (visual color of yellow). 2-(2-thiazolylazo)-p-cresol could thus be applied to develop an effective simulated colorimetric INHIBIT logic gate with mercury ion and proton as inputs. Consequently, green color with the absorption peak at 610?nm was outputted from yellow color of 2-(2-thiazolylazo)-p-cresol in the presence of mercury ion as an input signal at pH 7.0.     

催化动力学光度法测定合金中的镍

在(CH2)6N4HCl缓冲溶液中,OP乳化剂的存在下,痕量镍(Ⅱ)对H2O2氧化若丹明B(RhB)的褪色反应有强的催化作用,催化程度与镍(Ⅱ)量线性相关。基于此,建立了一种测定镍(Ⅱ)的分光光度法。结果表明,有色溶液的最大吸收波长为550nm,方法的检出限为04μg·L-1,催化程度与Ni(Ⅱ)量在0～030mg·L-1范围内符合比耳定律,选择性较好,可用于测定非晶态FeNiCr合金中的镍。     

The colouration of CaF 2 crystals by keV AND GeV ions

CaF 2 crystals have been implanted with a variety of ions of widely different energies and mass. Effects have been monitored using optical absorption in the range 120-750 v nm. This includes the vacuum UV region. For 100 v keV ions (Al, Mg, Kr) we observe extrinsic colloid bands in the case of implanted metal ions at high fluences (10 17 v ions v cm 2 ) but no colour centres (F, F 2 etc). For GeV ions (U, Ni) we observe prominent absorption bands in the visible region at fluences of 10 12 v ions v cm m 2 attributed to extrinsic calcium colloids. New optical features are discussed including an absorption band near 185 v nm in the VUV and bands at 604 v nm and 672 v nm in the visible region.     

[M(SS)(NN)](M=Zn2+,Cd2+)配合物分子内跃迁与结构的关系

报道了配合物[M(SS)(NN)](M=Zn2 ,Cd2 )(SS=mnt2-,1,2-二氰基乙烯-1,2-二硫醇离子,NN=5-NO2-phen,5-硝基-1,10-邻菲咯啉)的合成,探讨了Zn(SS)(NN)和Cd(SS)(NN)在二甲基亚砜(DM-SO)、二甲基甲酰胺(DMF)、丙酮(acetone)、吡啶(Py)等溶剂中的电子吸收光谱。研究发现配合物的紫外区的吸收带270～280nm,320～350nm,350～390nm本质上属于配体mnt2-,5-NO2-phen内部的πb→π*跃迁,可见光区400～500nm本质上属于配体mnt2-到配体5-NO2-phen的荷移跃迁(LL′CT)。确认了标题配合物的荷移跃迁光谱在相关分子轨道能级图中的对应关系。标题配合物的LL′CT吸收带与组成相似配合物M(SS)(NN)(M=Co2 ,Fe2 ,Ni2 ,Cu2 )的对应吸收带相比较弱一些,这是由于[M(SS)(NN)](M=Zn2 ,Cd2 )的LL′CT谱带(7b2→7b1)是部分解除轨道禁阻的跃迁。     

钨酸锌激光晶体的光谱测量

用基质晶片作参比,测量了Cu+、Er3+等离子激活的钨酸锌晶体的光谱,并进行了分析讨论,发现激活离子与基质晶格之间存在能量传递过程.晶体在可见光区有比较强的荧光.     

Nonlinear optical properties of an azobenzene polymer

The nonlinear optical properties of an azobenzene polymer azol2-MO were investigated by a Z-scan technique. The polymer was synthesized by assembling the liquid-crystalline polymer azol2 with methyl orange. The nonlinear refrac- tive index （1.39×10^-15 cm2/W） and the nonlinear absorption coefficient （0.11 cm/GW） of azol2-MO were determined with 532-nm picosecond laser pulses at the irradiance of 92.40 GW/cm2. When compared to the nonlinear properties of azol2 and methyl orange, azol2-MO possesses the advantages of its two constituents and shows larger nonlinear optical properties.     

一种新型偶氮化合物的纳秒光限幅特性研究

研究了反式—4—{[p—(N,N—二羟乙基胺基)偶氮苯]乙烯基}吡啶在N,N—二甲基甲酰胺(DMF)中的光限幅性能。实验结果表明,该偶氮化合物的DMF溶液对波长为532nm,脉冲宽度为8ns的激光脉冲具有很强的光限幅特性。理论分析表明,光限幅效应主要起源于材料的双光子吸收。利用双光子吸收模型拟合光限幅实验数据得到材料的双光子吸收系数β=1.6×10-9cm/W。     

Synthesis and microstructure of Co/Ni: MgGa<Subscript>2</Subscript>O<Subscript>4</Subscript> nanoparticles

This report discusses the preparation and microstructure of Co/Ni co-doped MgGa₂O₄ nanoparticles. The nanoparticles with the size of 20–55 nm were synthesized by sol-gel method. The phase and crystallinity were confirmed by X-ray powder diffraction (XRD) pattern. The particle size was estimated according to XRD data and transmission electron microscopy. The electronic structure was studied using X-ray photoelectron spectroscopy (XPS). The XPS studies showed that Ga³⁺ ions possess tetrahedral and octahedral sites of spinel structure and the inverse degree (two times of the fraction of tetrahedral Ga³⁺ ions) has increased with the increase of the doping concentration of Co²⁺ and Ni²⁺ ions. For Co/Ni co-doped MgGa₂O₄, two broad absorption bands of 350~500 and 550~700 nm were observed in the absorption spectra. The broad band at 350~500 nm was assigned to the combination of the absorption of octahedral Co²⁺ and Ni²⁺ ions, whereas the absorption band at 550~700 nm is mainly due to tetrahedrally coordinated Co²⁺ ions and octahedrally coordinated Ni²⁺ ions.     

Ni、Co/AAO纳米有序阵列复合结构光吸收特性的比较研究

在多孔阳极氧化铝(AAO)模板中分别沉积金属镍(Ni)、钴(Co),制备了Ni／AAO和Co／AAO纳米有序阵列复合结构,对其光吸收特性进行了比较研究。实验结果表明．相同结构参量的模板中,Ni、Co纳米粒子的表观形状随沉积时间的变化规律基本一致．但Co/AAO及Ni／AAO复合结构的光吸收特性却有较大差异。Ni／AAO复合结构表现出间接带隙半导体的光学特征．而Co／AAO复合结构具有直接带隙半导体的光学特征。同时,随金属沉积量的增加,Ni／AAO吸收边的红移量仅约为13nm．而Co/AAO复合结构的吸收边红移量却超过了80nm。用Maxwell-Garnett(M-G)理论分析了导致二者光吸收特性存在较大差异的主要原因。     

Superior tolerance of Ag/Ni multilayers against Kr ion irradiation: an in situ study

Monolithic Ag and Ni films and Ag/Ni multilayers with individual layer thickness of 5 and 50?nm were subjected to in situ Kr ion irradiation at room temperature to 1 displacement-per-atom (a fluence of 2?×?10¹⁴?ions/cm²). Monolithic Ag has high density of small loops (4?nm in diameter), whereas Ni has fewer but much greater loops (exceeding 20?nm). In comparison, dislocation loops, ～4?nm in diameter, were the major defects in the irradiated Ag/Ni 50?nm film, while the loops were barely observed in the Ag/Ni 5?nm film. At 0.2?dpa (0.4?×?10¹⁴?ions/cm), defect density in both monolithic Ag and Ni saturated at 1.6 and 0.2?×?10²³/m³, compared with 0.8?×?10²³/m³ in Ag/Ni 50?nm multilayer at a saturation fluence of ～1?dpa (2?×?10¹⁴?ions/cm²). Direct observations of frequent loop absorption by layer interfaces suggest that these interfaces are efficient defect sinks. Ag/Ni 5?nm multilayer showed a superior morphological stability against radiation compared to Ag/Ni 50?nm film.     

偶氮染料掺杂高分子PMMA薄膜的光学参数

在单晶硅片上,利用旋涂法,制备了偶氮染料掺杂高分子（ＰＭＭＡ）薄膜,可变入射角、波长扫描的全自动椭圆偏振光谱仪,研究了薄膜的复折射率、吸收系数和厚度,分析了影响薄膜电子光谱的因素。研究结果表明,该薄膜在４００～６００ｎｍ波长范围内,存在强而宽的吸收,并且发现分子聚集状态对该染料的吸收光谱有较大的影响。     

Optical properties of sol-gel fabricated Ni/SiO2 glass nanocomposites

Nickel nanoparticles were grown in silica glass by annealing of the sol-gel prepared silicate matrices doped with nickel nitrate. TEM characterization of Ni/SiO₂ glass proves the formation of isolated spherical nickel nanoparticles with mean sizes 6.7 and 20 nm depending on annealing conditions. The absorption and photoluminescence spectra of Ni/SiO₂ glasses were measured. In the absorption spectra, we observed the band related to the surface plasmon resonance (SPR) in Ni nanoparticles. The broadening of SPR was observed with decrease of Ni nanoparticle size. The width of the surface plasmon band decreases 1.5 times at the lowering of temperature from 293 to 2 K because of strong electron-phonon interaction. The spectra proved the creation of nickel oxide NiO clusters and Ni²⁺ ions in silica glass as well.     

敏化光波长对(Fe,Ni):LiNbO3晶体全息记录性能的影响

分别采用514 nm绿光、488 nm蓝光和390 nm紫外光作为敏化光,633 nm红光作为记录光,详细研究了敏化光波长对氧化(Fe,Ni):LiNbO3晶体全息记录性能的影响.结果表明:随着敏化光波长的逐渐减小,氧化(Fe,Ni):LiNbO3晶体的非挥发全息记录性能逐渐优化,390 nm紫外光是这三种敏化光中最优的敏化光.考虑敏化光的吸收,为了在双中心全息记录中获得最优的性能,应当选择合适波长的敏化光:一方面短波长敏化光能有效地敏化深中心;另一方面短波长敏化光的吸收太强(如对光折变效应无用的基质吸收),不能沿厚度方向有效地敏化晶体,所以实际上需折衷考虑,并从理论上给予了解释.     

Ni2+ emission in SrF2

Luminescence measurements of X-irradiated SrF₂:Ni are reported. After X-irradiation two emission bands have been found. One of them peaked at 293 nm and has an excitation band at 267 nm. The other one at about 770 nm, which is much weaker, has an excitation band at 274 nm. Both emission bands are also observed under X-ray excitation. A comparison with some previous studies of the absorption and thermoluminescence properties of X-irradiated SrF₂:Ni indicates that the emission bands are due to two different kinds of Ni²⁺ centers. The proposed emission mechanisms are similar to those found in CaF₂:Ni.     

Co,Mn,Ni的联苯酸配合物的合成及光谱研究

合成了联苯酸 ,并以其和吡啶为配体 ,制备了第一过渡系金属离子Co(Ⅱ ) ,Mn(Ⅱ ) ,Ni(Ⅱ )的 3种配合物 ,并通过元素分析、IR及UV等手段对配合物进行了表征 ,推测了可能的组成和结构。