A series of cobalt and metal-free phthalocyanine ambipolar semiconductors, MPc[β/α-O(4-CF₃-Ph)₄] (M = Co, 2H) (1–4), are synthesized and fabricated into self-assembled microstructures. The Co[Pc(β/α-OPhCF₃)₄] (1 and 3) molecules formed one-dimensional (1D) nanoribbons (400–300 nm) with a larger width of 1 relative to 3, whereas the H₂Pc[β/α-O(4-CF₃-Ph)₄] (2 and 4) molecules self-assembled into wider microbelts (5–4 μm) with 2 larger than 4, showing the effect of the M center and the substituent positions of the Pc rings on the dimensions of the microstructures. An increased crystallinity is revealed in the order of 4 < 3 < 2 < 1, resulting in an increased conductivity in the same order. Towards NO₂ and NH₃, both positive and negative current changes are found among the sensors 1–4, with the lowest limit of detection (LOD) as low as 3 ppb for NO₂ and 420 ppb for NH₃ from 1, while a positive current response to H₂S is obtained only from 1 with a LOD of 100 ppb, respectively, achieving the best results for the room-temperature detection of NO₂, NH₃ and H₂S gases based on all of the solution-processed phthalocyanine-based sensors reported so far. Accordingly, the sensor responses are dominated by both M-analyst interaction (M = Co, 2H) and conductivity among the sensors 1–4. In particular, different sensor arrays consisting of the sensor of 1 combined with one of the other three sensors of 2–4 are established. NO₂, NH₃ and H₂S gases at ppb levels can be accurately identified by the combination of two parameters, namely current change direction and sensitivity.

中文翻译：

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一种基于灵敏度和电流变化的酞菁传感器阵列，可高度灵敏地鉴定ppb级的三种有毒气体

合成了一系列无钴和无金属的酞菁双极性半导体MPc [β/α-O（4-CF ₃ -Ph）₄ ]（M = Co，2H）（1-4），并将其组装成自组装体微观结构。共同[PC（β/α-OPhCF ₃）₄ ]（1和3）分子形成的一维（1D）纳米带（400-300纳米），用一个较大的宽度1个相对于3，而ħ ₂ PC [ β/α-O（4-CF ₃ -Ph）₄ ]（2和4）分子自组装成更宽的微带（5–4μm），其中2个大于4，显示了M中心和Pc环的取代基位置对微观结构尺寸的影响。结晶度以4 < 3 < 2 < 1的顺序显示，导致电导率以相同的顺序增加。向NO ₂和NH ₃，正的和负的电流变化的传感器中发现1-4，用检测（LOD）为低的最低限度为3 ppb的为NO ₂和420 ppb的用于NH ₃从1，而对H ₂ S的正电流响应仅从1获得LOD分别为100 ppb，根据迄今为止报道的所有溶液处理的基于酞菁的传感器，在室温下检测NO ₂，NH ₃和H ₂ S气体均获得最佳结果。因此，传感器响应受M-分析物相互作用（M = Co，2H）和传感器1-4之间电导率的支配。特别是，建立了由1个传感器与2–4个其他三个传感器之一组合而成的不同传感器阵列。NO ₂，NH ₃和H ₂可以通过两个参数（电流变化方向和灵敏度）的组合来准确识别ppb级的S气体。